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Sekiguchi F, Narita H, Hirori H, Ono T, Kanemitsu Y. Anomalous behavior of critical current in a superconducting film triggered by DC plus terahertz current. Nat Commun 2024; 15:4435. [PMID: 38789464 PMCID: PMC11126563 DOI: 10.1038/s41467-024-48738-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2023] [Accepted: 05/07/2024] [Indexed: 05/26/2024] Open
Abstract
The critical current in a superconductor (SC) determines the performance of many SC devices, including SC diodes which have attracted recent attention. Hitherto, studies of SC diodes are limited in the DC-field measurements, and their performance under a high-frequency current remains unexplored. Here, we conduct the first investigation on the interaction between the DC and terahertz (THz) current in a SC artificial superlattice. We found that the DC critical current is sensitively modified by THz pulse excitations in a nontrivial manner. In particular, at low-frequency THz excitations below the SC gap, the critical current becomes sensitive to the THz-field polarization direction. Furthermore, we observed anomalous behavior in which a supercurrent flows with an amplitude larger than the modified critical current. Assuming that vortex depinning determines the critical current, we show that the THz-current-driven vortex dynamics reproduce the observed behavior. While the delicate nonreciprocity in the critical current is obscured by the THz pulse excitations, the interplay between the DC and THz current causes a non-monotonic SC/normal-state switching with current amplitude, which can pave a pathway to developing SC devices with novel functionalities.
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Affiliation(s)
- Fumiya Sekiguchi
- Institute for Chemical Research, Kyoto University, Uji, Kyoto, 611-0011, Japan.
| | - Hideki Narita
- Institute for Chemical Research, Kyoto University, Uji, Kyoto, 611-0011, Japan
| | - Hideki Hirori
- Institute for Chemical Research, Kyoto University, Uji, Kyoto, 611-0011, Japan
| | - Teruo Ono
- Institute for Chemical Research, Kyoto University, Uji, Kyoto, 611-0011, Japan
| | - Yoshihiko Kanemitsu
- Institute for Chemical Research, Kyoto University, Uji, Kyoto, 611-0011, Japan.
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2
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Soori A. Josephson diode effect in junctions of superconductors with band asymmetric metals. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2024; 36:335303. [PMID: 38740042 DOI: 10.1088/1361-648x/ad4aad] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/07/2024] [Accepted: 05/13/2024] [Indexed: 05/16/2024]
Abstract
At interfaces connecting two superconductors (SCs) separated by a metallic layer, an electric current is induced when there is a disparity in the phases of the two superconductors. We elucidate this phenomenon based on the weights of the Andreev bound states associated with the states carrying currents in forward and reverse directions. Typically, current phase relation (CPR) in Josephson junctions is an odd function. When time reversal and inversion symmetries are broken at the junction, CPR ceases to be an odd function and the system may exhibit Josephson diode effect. This phenomenon has been studied in spin orbit coupled systems under an external Zeeman field wherein the magnetochiral anisotropy is responsible for the Josephson diode effect. Recently introduced the band asymmetric metal (BAM) model presents a novel avenue, featuring an asymmetric band structure. We investigate DC Josephson effect in SC-BAM-SC junctions and find that band asymmetry can lead to Josephson diode effect and anomalous Josephson effect. We explain the mechanism behind these effects based on interference of plane wave modes within the Bogoliubov de-Genne formalism. We calculate diode effect coefficient for different values of the parameters.
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Affiliation(s)
- Abhiram Soori
- School of Physics, University of Hyderabad, Prof. C. R. Rao Road, Gachibowli, Hyderabad 500046, India
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3
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Asaba T, Naritsuka M, Asaeda H, Kosuge Y, Ikemori S, Suetsugu S, Kasahara Y, Kohsaka Y, Terashima T, Daido A, Yanase Y, Matsuda Y. Evidence for a finite-momentum Cooper pair in tricolor d-wave superconducting superlattices. Nat Commun 2024; 15:3861. [PMID: 38719822 PMCID: PMC11078924 DOI: 10.1038/s41467-024-47875-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2023] [Accepted: 04/09/2024] [Indexed: 05/12/2024] Open
Abstract
Fermionic superfluidity with a nontrivial Cooper-pairing, beyond the conventional Bardeen-Cooper-Schrieffer state, is a captivating field of study in quantum many-body systems. In particular, the search for superconducting states with finite-momentum pairs has long been a challenge, but establishing its existence has long suffered from the lack of an appropriate probe to reveal its momentum. Recently, it has been proposed that the nonreciprocal electron transport is the most powerful probe for the finite-momentum pairs, because it directly couples to the supercurrents. Here we reveal such a pairing state by the non-reciprocal transport on tricolor superlattices with strong spin-orbit coupling combined with broken inversion-symmetry consisting of atomically thin d-wave superconductor CeCoIn5. We find that while the second-harmonic resistance exhibits a distinct dip anomaly at the low-temperature (T)/high-magnetic field (H) corner in the HT-plane for H applied to the antinodal direction of the d-wave gap, such an anomaly is absent for H along the nodal direction. By carefully isolating extrinsic effects due to vortex dynamics, we reveal the presence of a non-reciprocal response originating from intrinsic superconducting properties characterized by finite-momentum pairs. We attribute the high-field state to the helical superconducting state, wherein the phase of the order parameter is spontaneously spatially modulated.
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Affiliation(s)
- T Asaba
- Department of Physics, Kyoto University, Kyoto, 606-8502, Japan.
| | - M Naritsuka
- Department of Physics, Kyoto University, Kyoto, 606-8502, Japan
- RIKEN Center for Emergent Matter Science, Wako, Saitama, 351-0198, Japan
| | - H Asaeda
- Department of Physics, Kyoto University, Kyoto, 606-8502, Japan
| | - Y Kosuge
- Department of Physics, Kyoto University, Kyoto, 606-8502, Japan
| | - S Ikemori
- Department of Physics, Kyoto University, Kyoto, 606-8502, Japan
| | - S Suetsugu
- Department of Physics, Kyoto University, Kyoto, 606-8502, Japan
| | - Y Kasahara
- Department of Physics, Kyoto University, Kyoto, 606-8502, Japan
| | - Y Kohsaka
- Department of Physics, Kyoto University, Kyoto, 606-8502, Japan
| | - T Terashima
- Department of Physics, Kyoto University, Kyoto, 606-8502, Japan
| | - A Daido
- Department of Physics, Kyoto University, Kyoto, 606-8502, Japan
| | - Y Yanase
- Department of Physics, Kyoto University, Kyoto, 606-8502, Japan
| | - Y Matsuda
- Department of Physics, Kyoto University, Kyoto, 606-8502, Japan.
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4
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Ghosh S, Patil V, Basu A, Kuldeep, Dutta A, Jangade DA, Kulkarni R, Thamizhavel A, Steiner JF, von Oppen F, Deshmukh MM. High-temperature Josephson diode. NATURE MATERIALS 2024; 23:612-618. [PMID: 38321240 DOI: 10.1038/s41563-024-01804-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/05/2023] [Accepted: 01/08/2024] [Indexed: 02/08/2024]
Abstract
Many superconducting systems with broken time-reversal and inversion symmetry show a superconducting diode effect, a non-reciprocal phenomenon analogous to semiconducting p-n-junction diodes. While the superconducting diode effect lays the foundation for realizing ultralow dissipative circuits, Josephson-phenomena-based diode effect (JDE) can enable the realization of protected qubits. The superconducting diode effect and JDE reported thus far are at low temperatures (~4 K), limiting their applications. Here we demonstrate JDE persisting up to 77 K using an artificial Josephson junction of twisted layers of Bi2Sr2CaCu2O8+δ. JDE manifests as an asymmetry in the magnitude and distributions of switching currents, attaining the maximum at 45° twist. The asymmetry is induced by and tunable with a very small magnetic field applied perpendicular to the junction and arises due to interaction between Josephson and Abrikosov vortices. We report a large asymmetry of 60% at 20 K. Our results provide a path towards realizing superconducting Josephson circuits at liquid-nitrogen temperature.
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Affiliation(s)
- Sanat Ghosh
- Department of Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research, Mumbai, India.
| | - Vilas Patil
- Department of Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research, Mumbai, India
| | - Amit Basu
- Department of Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research, Mumbai, India
| | - Kuldeep
- Department of Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research, Mumbai, India
| | - Achintya Dutta
- Department of Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research, Mumbai, India
| | - Digambar A Jangade
- Department of Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research, Mumbai, India
| | - Ruta Kulkarni
- Department of Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research, Mumbai, India
| | - A Thamizhavel
- Department of Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research, Mumbai, India
| | - Jacob F Steiner
- Dahlem Center for Complex Quantum Systems and Fachbereich Physik, Freie Universität Berlin, Berlin, Germany
| | - Felix von Oppen
- Dahlem Center for Complex Quantum Systems and Fachbereich Physik, Freie Universität Berlin, Berlin, Germany
| | - Mandar M Deshmukh
- Department of Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research, Mumbai, India.
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5
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Bahamon DA, Gómez-Santos G, Efetov DK, Stauber T. Chirality Probe of Twisted Bilayer Graphene in the Linear Transport Regime. NANO LETTERS 2024; 24:4478-4484. [PMID: 38584591 PMCID: PMC11036400 DOI: 10.1021/acs.nanolett.4c00371] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2024] [Revised: 03/27/2024] [Accepted: 03/27/2024] [Indexed: 04/09/2024]
Abstract
We propose minimal transport experiments in the coherent regime that can probe the chirality of twisted moiré structures. We show that only with a third contact and in the presence of an in-plane magnetic field (or another time-reversal symmetry breaking effect) a chiral system may display nonreciprocal transport in the linear regime. We then propose to use the third lead as a voltage probe and show that opposite enantiomers give rise to different voltage drops on the third lead. Additionally, in the scenario of layer-discriminating contacts, the third lead can serve as a current probe capable of detecting different handedness even in the absence of a magnetic field. In a complementary configuration, applying opposite voltages on the two layers of the third lead gives rise to a chiral (super)current in the absence of a source-drain voltage whose direction is determined by its chirality.
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Affiliation(s)
- Dario A. Bahamon
- School of Engineering, Mackenzie Presbyterian University, São Paulo 01302-907, Brazil
- MackGraphe
Graphene and Nanomaterials Research Institute, Mackenzie Presbyterian University, São Paulo 01302-907, Brazil
- Departamento
de Teoría y Simulación de Materiales, Instituto de Ciencias de Materiales de Madrid, CSIC, E-28049 Madrid, Spain
| | - Guillermo Gómez-Santos
- Departamento
de Física de la Materia Condensada, Instituto Nicolás
Cabrera and Condensed Matter Physics Center (IFIMAC), Universidad Autónoma de Madrid, E-28049 Madrid, Spain
| | - Dmitri K. Efetov
- Fakultät
für Physik, Ludwig-Maximilians-Universität, Schellingstrasse 4, D-80799 München, Germany
- Munich Center
for Quantum Science and Technology (MCQST), Schellingstrasse 4, D-80799 München, Germany
| | - Tobias Stauber
- Departamento
de Teoría y Simulación de Materiales, Instituto de Ciencias de Materiales de Madrid, CSIC, E-28049 Madrid, Spain
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6
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Li C, Lyu YY, Yue WC, Huang P, Li H, Li T, Wang CG, Yuan Z, Dong Y, Ma X, Tu X, Tao T, Dong S, He L, Jia X, Sun G, Kang L, Wang H, Peeters FM, Milošević MV, Wu P, Wang YL. Unconventional Superconducting Diode Effects via Antisymmetry and Antisymmetry Breaking. NANO LETTERS 2024; 24:4108-4116. [PMID: 38536003 DOI: 10.1021/acs.nanolett.3c05008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2024]
Abstract
Symmetry breaking plays a pivotal role in unlocking intriguing properties and functionalities in material systems. For example, the breaking of spatial and temporal symmetries leads to a fascinating phenomenon: the superconducting diode effect. However, generating and precisely controlling the superconducting diode effect pose significant challenges. Here, we take a novel route with the deliberate manipulation of magnetic charge potentials to realize unconventional superconducting flux-quantum diode effects. We achieve this through suitably tailored nanoengineered arrays of nanobar magnets on top of a superconducting thin film. We demonstrate the vital roles of inversion antisymmetry and its breaking in evoking unconventional superconducting effects, namely a magnetically symmetric diode effect and an odd-parity magnetotransport effect. These effects are nonvolatilely controllable through in situ magnetization switching of the nanobar magnets. Our findings promote the use of antisymmetry (breaking) for initiating unconventional superconducting properties, paving the way for exciting prospects and innovative functionalities in superconducting electronics.
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Affiliation(s)
- Chong Li
- Research Institute of Superconductor Electronics, School of Electronic Science and Engineering, Nanjing University, Nanjing 210023, China
- Purple Mountain Laboratories, Nanjing 211111, China
| | - Yang-Yang Lyu
- Research Institute of Superconductor Electronics, School of Electronic Science and Engineering, Nanjing University, Nanjing 210023, China
- Purple Mountain Laboratories, Nanjing 211111, China
| | - Wen-Cheng Yue
- Research Institute of Superconductor Electronics, School of Electronic Science and Engineering, Nanjing University, Nanjing 210023, China
- Purple Mountain Laboratories, Nanjing 211111, China
| | - Peiyuan Huang
- Research Institute of Superconductor Electronics, School of Electronic Science and Engineering, Nanjing University, Nanjing 210023, China
| | - Haojie Li
- Research Institute of Superconductor Electronics, School of Electronic Science and Engineering, Nanjing University, Nanjing 210023, China
| | - Tianyu Li
- Research Institute of Superconductor Electronics, School of Electronic Science and Engineering, Nanjing University, Nanjing 210023, China
| | - Chen-Guang Wang
- Research Institute of Superconductor Electronics, School of Electronic Science and Engineering, Nanjing University, Nanjing 210023, China
- Purple Mountain Laboratories, Nanjing 211111, China
| | - Zixiong Yuan
- Research Institute of Superconductor Electronics, School of Electronic Science and Engineering, Nanjing University, Nanjing 210023, China
| | - Ying Dong
- College of Metrology & Measurement Engineering, China Jiliang University, Hangzhou 310018, China
| | - Xiaoyu Ma
- Microsoft, One Microsoft Way, Redmond, Washington 98052, United States
| | - Xuecou Tu
- Research Institute of Superconductor Electronics, School of Electronic Science and Engineering, Nanjing University, Nanjing 210023, China
| | - Tao Tao
- National Key Laboratory of Spintronics, Nanjing University, Suzhou 215163, China
| | - Sining Dong
- Research Institute of Superconductor Electronics, School of Electronic Science and Engineering, Nanjing University, Nanjing 210023, China
- National Key Laboratory of Spintronics, Nanjing University, Suzhou 215163, China
| | - Liang He
- National Key Laboratory of Spintronics, Nanjing University, Suzhou 215163, China
| | - Xiaoqing Jia
- Research Institute of Superconductor Electronics, School of Electronic Science and Engineering, Nanjing University, Nanjing 210023, China
| | - Guozhu Sun
- Research Institute of Superconductor Electronics, School of Electronic Science and Engineering, Nanjing University, Nanjing 210023, China
- Purple Mountain Laboratories, Nanjing 211111, China
| | - Lin Kang
- Research Institute of Superconductor Electronics, School of Electronic Science and Engineering, Nanjing University, Nanjing 210023, China
| | - Huabing Wang
- Research Institute of Superconductor Electronics, School of Electronic Science and Engineering, Nanjing University, Nanjing 210023, China
- Purple Mountain Laboratories, Nanjing 211111, China
| | - Francois M Peeters
- Department of Physics, University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerp, Belgium
- Departamento de Física, Universidade Federal do Ceará́, Campus do Pici, 60455-900 Fortaleza, Ceará, Brazil
| | - Milorad V Milošević
- Department of Physics, University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerp, Belgium
- Instituto de Física, Universidade Federal de Mato Grosso, Cuiabá, Mato Grosso 78060-900, Brazil
| | - Peiheng Wu
- Research Institute of Superconductor Electronics, School of Electronic Science and Engineering, Nanjing University, Nanjing 210023, China
- Purple Mountain Laboratories, Nanjing 211111, China
| | - Yong-Lei Wang
- Research Institute of Superconductor Electronics, School of Electronic Science and Engineering, Nanjing University, Nanjing 210023, China
- Purple Mountain Laboratories, Nanjing 211111, China
- National Key Laboratory of Spintronics, Nanjing University, Suzhou 215163, China
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7
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Coraiola M, Svetogorov AE, Haxell DZ, Sabonis D, Hinderling M, Ten Kate SC, Cheah E, Krizek F, Schott R, Wegscheider W, Cuevas JC, Belzig W, Nichele F. Flux-Tunable Josephson Diode Effect in a Hybrid Four-Terminal Josephson Junction. ACS NANO 2024; 18:9221-9231. [PMID: 38488287 DOI: 10.1021/acsnano.4c01642] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/27/2024]
Abstract
We investigate the direction-dependent switching current in a flux-tunable four-terminal Josephson junction defined in an InAs/Al two-dimensional heterostructure. The device exhibits the Josephson diode effect with switching currents that depend on the sign of the bias current. The superconducting diode efficiency, reaching a maximum of |η| ≈ 34%, is widely tunable─both in amplitude and sign─as a function of magnetic fluxes and gate voltages. Our observations are supported by a circuit model of three parallel Josephson junctions with nonsinusoidal current-phase relation. With respect to conventional Josephson interferometers, phase-tunable multiterminal Josephson junctions enable large diode efficiencies in structurally symmetric devices, where local magnetic fluxes generated on the chip break both time-reversal and spatial symmetries. Our work presents an approach for developing Josephson diodes with wide-range tunability that do not rely on exotic materials.
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Affiliation(s)
- Marco Coraiola
- IBM Research Europe─Zurich, 8803 Rüschlikon, Switzerland
| | | | | | | | | | | | - Erik Cheah
- Laboratory for Solid State Physics, ETH Zürich, 8093 Zürich, Switzerland
| | - Filip Krizek
- IBM Research Europe─Zurich, 8803 Rüschlikon, Switzerland
- Laboratory for Solid State Physics, ETH Zürich, 8093 Zürich, Switzerland
- Institute of Physics, Czech Academy of Sciences, 162 00 Prague, Czech Republic
| | - Rüdiger Schott
- Laboratory for Solid State Physics, ETH Zürich, 8093 Zürich, Switzerland
| | - Werner Wegscheider
- Laboratory for Solid State Physics, ETH Zürich, 8093 Zürich, Switzerland
| | - Juan Carlos Cuevas
- Fachbereich Physik, Universität Konstanz, D-78457 Konstanz, Germany
- Departamento de Física Teórica de la Materia Condensada and Condensed Matter Physics Center (IFIMAC), Universidad Autónoma de Madrid, E-28049 Madrid, Spain
| | - Wolfgang Belzig
- Fachbereich Physik, Universität Konstanz, D-78457 Konstanz, Germany
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8
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Wang K, Zhao Z, Wu G, Jiang D, Lan Y. Investigating the Influence of Impurity Defects on the Adsorption Behavior of Hydrated Sc 3+ on the Kaolinite (001) Surface Using Density Functional Theory. MATERIALS (BASEL, SWITZERLAND) 2024; 17:610. [PMID: 38591439 PMCID: PMC10856214 DOI: 10.3390/ma17030610] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2023] [Revised: 01/03/2024] [Accepted: 01/24/2024] [Indexed: 04/10/2024]
Abstract
In natural kaolinite lattices, Al3+ can potentially be substituted by cations such as Mg2+, Ca2+, and Fe3+, thereby influencing its adsorption characteristics towards rare earth elements like Sc3+. Density functional theory (DFT) has emerged as a crucial tool in the study of adsorption phenomena, particularly for understanding the complex interactions of rare earth elements with clay minerals. This study employed DFT to investigate the impact of these three dopant elements on the adsorption of hydrated Sc3+ on the kaolinite (001) Al-OH surface. We discerned that the optimal adsorption configuration for hydrated Sc3+ is Sc(H2O)83+, with a preference for adsorption at the deprotonated Ou sites. Among the dopants, Mg doping exhibited superior stability with a binding energy of -4.311 eV and the most negative adsorption energy of -1104.16 kJ/mol. Both Mg and Ca doping enhanced the covalency of the Al-O bond, leading to a subtle shift in the overall density of states towards higher energies, thereby augmenting the reactivity of the O atoms. In contrast, Fe doping caused a pronounced shift in the density of states towards lower energies. Compared to the undoped kaolinite, Mg and Ca doping further diminished the adsorption energy of hydrated Sc3+ and increased its coordination number, while Fe doping elevated the adsorption energy. This study offers profound insights into understanding the role of dopant elements in the adsorption of hydrated Sc3+ on kaolinite.
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Affiliation(s)
- Kaiyu Wang
- School of Materials and Energy, Yunnan University, Kunming 650091, China
| | - Zilong Zhao
- School of Materials and Energy, Yunnan University, Kunming 650091, China
| | - Guoyuan Wu
- School of Materials and Energy, Yunnan University, Kunming 650091, China
| | - Dengbang Jiang
- Green Preparation Technology of Biobased Materials National & Local Joint Engineering Research Center, Yunnan Minzu University, Kunming 650500, China
| | - Yaozhong Lan
- School of Materials and Energy, Yunnan University, Kunming 650091, China
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9
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Banerjee S, Scheurer MS. Enhanced Superconducting Diode Effect due to Coexisting Phases. PHYSICAL REVIEW LETTERS 2024; 132:046003. [PMID: 38335356 DOI: 10.1103/physrevlett.132.046003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/14/2023] [Accepted: 12/14/2023] [Indexed: 02/12/2024]
Abstract
The superconducting diode effect refers to an asymmetry in the critical supercurrent J_{c}(n[over ^]) along opposite directions, J_{c}(n[over ^])≠J_{c}(-n[over ^]). While the basic symmetry requirements for this effect are known, it is, for junction-free systems, difficult to capture within current theoretical models the large current asymmetries J_{c}(n[over ^])/J_{c}(-n[over ^]) recently observed in experiment. We here propose and develop a theory for an enhancement mechanism of the diode effect arising from spontaneous symmetry breaking. We show-both within a phenomenological and a microscopic theory-that there is a coupling of the supercurrent and the underlying symmetry-breaking order parameter. This coupling can enhance the current asymmetry significantly. Our work might not only provide a possible explanation for recent experiments on trilayer graphene but also pave the way for future realizations of the superconducting diode effect with large current asymmetries.
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Affiliation(s)
- Sayan Banerjee
- Institute for Theoretical Physics III, University of Stuttgart, 70550 Stuttgart, Germany and Institute for Theoretical Physics, University of Innsbruck, Innsbruck A-6020, Austria
| | - Mathias S Scheurer
- Institute for Theoretical Physics III, University of Stuttgart, 70550 Stuttgart, Germany and Institute for Theoretical Physics, University of Innsbruck, Innsbruck A-6020, Austria
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10
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Qiao J, Liu H, Zhang D. Electric Tuning of Vortex Ratchet Effect in NbSe 2. NANO LETTERS 2024; 24:511-518. [PMID: 38147442 DOI: 10.1021/acs.nanolett.3c04585] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2023]
Abstract
Inversion symmetry breaking has played an important role in recent discoveries of nonreciprocal charge transport. Niobium diselenide, for example, lacks an inversion center in the monolayer form and can host prominent nonreciprocal transport property. Here, however, we observe a nonreciprocal transport signal in the second-harmonic channel of bulk-like NbSe2, in which inversion symmetry of the lattice seems preserved. The second-harmonic signal occurs along different in-plane current orientations and appears not only in the vortex-liquid regime but also even in the superconducting fluctuation regime without an applied magnetic field. By adding a direct current (DC) bias, we quantify the symmetry breaking effect in the vortex-liquid regime. The DC bias also suggests that the rectification effect at the contacts may account for the seemingly nonreciprocal transport at zero magnetic field. Our results demonstrate that DC biasing is a useful knob for addressing nonreciprocal charge transport in a wide range of materials.
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Affiliation(s)
- Jiabin Qiao
- State Key Laboratory of Low Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing 100084, China
- Centre for Quantum Physics, Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement, School of Physics, Beijing Institute of Technology, Beijing 100081, China
- Beijing Academy of Quantum Information Sciences, Beijing 100193, China
| | - Haiwen Liu
- Center for Advanced Quantum Studies, Department of Physics, Beijing Normal University, Beijing 1000875, China
| | - Ding Zhang
- State Key Laboratory of Low Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing 100084, China
- Beijing Academy of Quantum Information Sciences, Beijing 100193, China
- RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama 351-0198, Japan
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11
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Zhao SYF, Cui X, Volkov PA, Yoo H, Lee S, Gardener JA, Akey AJ, Engelke R, Ronen Y, Zhong R, Gu G, Plugge S, Tummuru T, Kim M, Franz M, Pixley JH, Poccia N, Kim P. Time-reversal symmetry breaking superconductivity between twisted cuprate superconductors. Science 2023; 382:1422-1427. [PMID: 38060675 DOI: 10.1126/science.abl8371] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2021] [Accepted: 11/07/2023] [Indexed: 12/23/2023]
Abstract
Twisted interfaces between stacked van der Waals (vdW) cuprate crystals present a platform for engineering superconducting order parameters by adjusting stacking angles. Using a cryogenic assembly technique, we construct twisted vdW Josephson junctions (JJs) at atomically sharp interfaces between Bi2Sr2CaCu2O8+x crystals, with quality approaching the limit set by intrinsic JJs. Near 45° twist angle, we observe fractional Shapiro steps and Fraunhofer patterns, consistent with the existence of two degenerate Josephson ground states related by time-reversal symmetry (TRS). By programming the JJ current bias sequence, we controllably break TRS to place the JJ into either of the two ground states, realizing reversible Josephson diodes without external magnetic fields. Our results open a path to engineering topological devices at higher temperatures.
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Affiliation(s)
- S Y Frank Zhao
- Department of Physics, Harvard University, Cambridge, MA 02138, USA
| | - Xiaomeng Cui
- Department of Physics, Harvard University, Cambridge, MA 02138, USA
| | - Pavel A Volkov
- Department of Physics, Harvard University, Cambridge, MA 02138, USA
- Center for Materials Theory, Department of Physics and Astronomy, Rutgers University, Piscataway, NJ 08854, USA
- Department of Physics, University of Connecticut, Storrs, CT 06269, USA
| | - Hyobin Yoo
- Department of Physics, Institute of Emergent Materials, Sogang University, Seoul 04107, Korea
| | - Sangmin Lee
- Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Korea
| | - Jules A Gardener
- Center for Nanoscale Systems, Harvard University, Cambridge, MA 02138, USA
| | - Austin J Akey
- Center for Nanoscale Systems, Harvard University, Cambridge, MA 02138, USA
| | - Rebecca Engelke
- Department of Physics, Harvard University, Cambridge, MA 02138, USA
| | - Yuval Ronen
- Department of Physics, Harvard University, Cambridge, MA 02138, USA
| | - Ruidan Zhong
- Department of Condensed Matter Physics and Materials Science, Brookhaven National Laboratory, Upton, NY 11973, USA
| | - Genda Gu
- Department of Condensed Matter Physics and Materials Science, Brookhaven National Laboratory, Upton, NY 11973, USA
| | - Stephan Plugge
- Department of Physics and Astronomy and Stewart Blusson Quantum Matter Institute, University of British Columbia, Vancouver, BC V6T 1Z4, Canada
| | - Tarun Tummuru
- Department of Physics and Astronomy and Stewart Blusson Quantum Matter Institute, University of British Columbia, Vancouver, BC V6T 1Z4, Canada
| | - Miyoung Kim
- Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Korea
| | - Marcel Franz
- Department of Physics and Astronomy and Stewart Blusson Quantum Matter Institute, University of British Columbia, Vancouver, BC V6T 1Z4, Canada
| | - Jedediah H Pixley
- Center for Materials Theory, Department of Physics and Astronomy, Rutgers University, Piscataway, NJ 08854, USA
| | - Nicola Poccia
- Department of Physics, Harvard University, Cambridge, MA 02138, USA
- Leibniz Institute for Solid State and Materials Research Dresden (IFW Dresden), 01069 Dresden, Germany
| | - Philip Kim
- Department of Physics, Harvard University, Cambridge, MA 02138, USA
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12
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Cheng D, Song B, Kang JH, Sundahl C, Edgeton AL, Luo L, Park JM, Collantes YG, Hellstrom EE, Mootz M, Perakis IE, Eom CB, Wang J. Study of Elastic and Structural Properties of BaFe 2As 2 Ultrathin Film Using Picosecond Ultrasonics. MATERIALS (BASEL, SWITZERLAND) 2023; 16:7031. [PMID: 37959629 PMCID: PMC10650054 DOI: 10.3390/ma16217031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/27/2023] [Revised: 10/30/2023] [Accepted: 10/30/2023] [Indexed: 11/15/2023]
Abstract
We obtain the through-thickness elastic stiffness coefficient (C33) in nominal 9 nm and 60 nm BaFe2As2 (Ba-122) thin films by using picosecond ultrasonics. Particularly, we reveal the increase in elastic stiffness as film thickness decreases from bulk value down to 9 nm, which we attribute to the increase in intrinsic strain near the film-substrate interface. Our density functional theory (DFT) calculations reproduce the observed acoustic oscillation frequencies well. In addition, temperature dependence of longitudinal acoustic (LA) phonon mode frequency for 9 nm Ba-122 thin film is reported. The frequency change is attributed to the change in Ba-122 orthorhombicity (a-b)/(a+b). This conclusion can be corroborated by our previous ultrafast ellipticity measurements in 9 nm Ba-122 thin film, which exhibit strong temperature dependence and indicate the structural phase transition temperature Ts.
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Affiliation(s)
- Di Cheng
- Department of Physics and Astronomy, Iowa State University, Ames, IA 50011, USA; (D.C.); (B.S.); (L.L.); (J.-M.P.)
- Ames National Laboratory-USDOE, Ames, IA 50011, USA
| | - Boqun Song
- Department of Physics and Astronomy, Iowa State University, Ames, IA 50011, USA; (D.C.); (B.S.); (L.L.); (J.-M.P.)
- Ames National Laboratory-USDOE, Ames, IA 50011, USA
| | - Jong-Hoon Kang
- Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, WI 53706, USA; (J.-H.K.); (C.S.); (A.L.E.); (C.-B.E.)
| | - Chris Sundahl
- Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, WI 53706, USA; (J.-H.K.); (C.S.); (A.L.E.); (C.-B.E.)
| | - Anthony L. Edgeton
- Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, WI 53706, USA; (J.-H.K.); (C.S.); (A.L.E.); (C.-B.E.)
| | - Liang Luo
- Department of Physics and Astronomy, Iowa State University, Ames, IA 50011, USA; (D.C.); (B.S.); (L.L.); (J.-M.P.)
- Ames National Laboratory-USDOE, Ames, IA 50011, USA
| | - Joong-Mok Park
- Department of Physics and Astronomy, Iowa State University, Ames, IA 50011, USA; (D.C.); (B.S.); (L.L.); (J.-M.P.)
- Ames National Laboratory-USDOE, Ames, IA 50011, USA
| | - Yesusa G. Collantes
- Applied Superconductivity Center, National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL 32310, USA (E.E.H.)
| | - Eric E. Hellstrom
- Applied Superconductivity Center, National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL 32310, USA (E.E.H.)
| | - Martin Mootz
- Department of Physics, University of Alabama at Birmingham, Birmingham, AL 35294-1170, USA; (M.M.); (I.E.P.)
| | - Ilias E. Perakis
- Department of Physics, University of Alabama at Birmingham, Birmingham, AL 35294-1170, USA; (M.M.); (I.E.P.)
| | - Chang-Beom Eom
- Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, WI 53706, USA; (J.-H.K.); (C.S.); (A.L.E.); (C.-B.E.)
| | - Jigang Wang
- Department of Physics and Astronomy, Iowa State University, Ames, IA 50011, USA; (D.C.); (B.S.); (L.L.); (J.-M.P.)
- Ames National Laboratory-USDOE, Ames, IA 50011, USA
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