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Krasnov MM, Novikova ND, Cattaneo R, Kalenyuk AA, Krasnov VM. Design aspects of Bi 2Sr 2CaCu 2O 8+δ THz sources: optimization of thermal and radiative properties. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2021; 12:1392-1403. [PMID: 35004123 PMCID: PMC8712971 DOI: 10.3762/bjnano.12.103] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/30/2021] [Accepted: 12/02/2021] [Indexed: 06/14/2023]
Abstract
Impedance matching and heat management are important factors influencing the performance of terahertz sources. In this work we analyze thermal and radiative properties of such devices based on mesa structures of a layered high-temperature superconductor Bi2Sr2CaCu2O8+δ. Two types of devices are considered containing either a conventional large single crystal or a whisker. We perform numerical simulations for various geometrical configurations and parameters and make a comparison with experimental data for the two types of devices. It is demonstrated that the structure and the geometry of both the superconductor and the electrodes play important roles. In crystal-based devices an overlap between the crystal and the electrode leads to appearance of a large parasitic capacitance, which shunts terahertz emission and prevents impedance matching with open space. The overlap is avoided in whisker-based devices. Furthermore, the whisker and the electrodes form a turnstile (crossed-dipole) antenna facilitating good impedance matching. This leads to more than an order of magnitude enhancement of the radiation power efficiency in whisker-based, compared to crystal-based, devices. These results are in good agreement with presented experimental data.
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Affiliation(s)
- Mikhail M Krasnov
- Keldysh Institute of Applied Mathematics of RAS, Moscow, Russia
- Moscow Institute of Physics and Technology, 141700 Dolgoprudny, Russia
| | - Natalia D Novikova
- Keldysh Institute of Applied Mathematics of RAS, Moscow, Russia
- Moscow Institute of Physics and Technology, 141700 Dolgoprudny, Russia
| | - Roger Cattaneo
- Department of Physics, Stockholm University, AlbaNova University Center, SE-10691 Stockholm, Sweden
| | - Alexey A Kalenyuk
- Department of Physics, Stockholm University, AlbaNova University Center, SE-10691 Stockholm, Sweden
- Institute of Metal Physics of National Academy of Sciences of Ukraine, 03142 Kyiv, Ukraine
- Kyiv Academic University, 03142 Kyiv, Ukraine
| | - Vladimir M Krasnov
- Moscow Institute of Physics and Technology, 141700 Dolgoprudny, Russia
- Department of Physics, Stockholm University, AlbaNova University Center, SE-10691 Stockholm, Sweden
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Liao M, Zhu Y, Zhang J, Zhong R, Schneeloch J, Gu G, Jiang K, Zhang D, Ma X, Xue QK. Superconductor-Insulator Transitions in Exfoliated Bi 2Sr 2CaCu 2O 8+δ Flakes. NANO LETTERS 2018; 18:5660-5665. [PMID: 30111116 DOI: 10.1021/acs.nanolett.8b02183] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
We realize superconductor-insulator transitions (SIT) in mechanically exfoliated Bi2Sr2CaCu2O8+δ (BSCCO) flakes and address simultaneously their transport properties as well as the evolution of density of states. Back-gating via the solid ion conductor (SIC) engenders a SIT in BSCCO due to the modulation of carrier density by intercalated lithium ions. Scaling analysis indicates that the SIT follows the theoretical description of a two-dimensional quantum phase transition (2D-QPT). We further carry out tunneling spectroscopy in graphite(G)/BSCCO heterojunctions. We observe V-shaped gaps in the critical regime of the SIT. The density of states in BSCCO gets symmetrically suppressed by further going into the insulating regime. Our technique of combining solid state gating with tunneling spectroscopy can be easily applied to the study of other two-dimensional materials.
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Affiliation(s)
- Menghan Liao
- State Key Laboratory of Low Dimensional Quantum Physics and Department of Physics , Tsinghua University , Beijing , 100084 , China
| | - Yuying Zhu
- State Key Laboratory of Low Dimensional Quantum Physics and Department of Physics , Tsinghua University , Beijing , 100084 , China
| | - Jin Zhang
- State Key Laboratory of Low Dimensional Quantum Physics and Department of Physics , Tsinghua University , Beijing , 100084 , China
| | - Ruidan Zhong
- Condensed Matter Physics and Materials Science Department , Brookhaven National Laboratory , Upton , New York 11973 , United States
| | - John Schneeloch
- Condensed Matter Physics and Materials Science Department , Brookhaven National Laboratory , Upton , New York 11973 , United States
- Department of Physics and Astronomy , Stony Brook University , Stony Brook , New York 11794 , United States
| | - Genda Gu
- Condensed Matter Physics and Materials Science Department , Brookhaven National Laboratory , Upton , New York 11973 , United States
| | - Kaili Jiang
- State Key Laboratory of Low Dimensional Quantum Physics and Department of Physics , Tsinghua University , Beijing , 100084 , China
- Tsinghua-Foxconn Nanotechnology Research Center , Tsinghua University , Beijing , 100084 , China
- Collaborative Innovation Center of Quantum Matter , Beijing 100084 , China
| | - Ding Zhang
- State Key Laboratory of Low Dimensional Quantum Physics and Department of Physics , Tsinghua University , Beijing , 100084 , China
- Collaborative Innovation Center of Quantum Matter , Beijing 100084 , China
| | - Xucun Ma
- State Key Laboratory of Low Dimensional Quantum Physics and Department of Physics , Tsinghua University , Beijing , 100084 , China
- Collaborative Innovation Center of Quantum Matter , Beijing 100084 , China
| | - Qi-Kun Xue
- State Key Laboratory of Low Dimensional Quantum Physics and Department of Physics , Tsinghua University , Beijing , 100084 , China
- Collaborative Innovation Center of Quantum Matter , Beijing 100084 , China
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Borodianskyi EA, Krasnov VM. Josephson emission with frequency span 1-11 THz from small Bi 2Sr 2CaCu 2O 8+δ mesa structures. Nat Commun 2017; 8:1742. [PMID: 29170380 PMCID: PMC5701082 DOI: 10.1038/s41467-017-01888-4] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2017] [Accepted: 10/22/2017] [Indexed: 11/09/2022] Open
Abstract
Mesa structures made of Bi2Sr2CaCu2O8+δ high-temperature superconductor represent stacks of atomic scale intrinsic Josephson junctions. They can be used for generation of high-frequency electromagnetic waves. Here we analyze Josephson emission from small-but-high mesas (with a small area, but containing many stacked junctions). We have found strong evidence for tunable terahertz emission with a good efficacy in a record high-frequency span 1-11 THz, approaching the theoretical upper limit for this superconductor. Emission maxima correspond to in-phase cavity modes in the mesas, indicating coherent superradiant nature of the emission. We conclude that terahertz emission requires a threshold number of junctions N ~ 100. The threshold behavior is not present in the classical description of stacked Josephson junctions and suggests importance of laser-like cascade amplification of the photon number in the cavity.
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Affiliation(s)
- E A Borodianskyi
- Department of Physics, Stockholm University, AlbaNova University Center, SE-106 91, Stockholm, Sweden
| | - V M Krasnov
- Department of Physics, Stockholm University, AlbaNova University Center, SE-106 91, Stockholm, Sweden.
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Chainani A, Sicot M, Fagot-Revurat Y, Vasseur G, Granet J, Kierren B, Moreau L, Oura M, Yamamoto A, Tokura Y, Malterre D. Evidence for Weakly Correlated Oxygen Holes in the Highest-T_{c} Cuprate Superconductor HgBa_{2}Ca_{2}Cu_{3}O_{8+δ}. PHYSICAL REVIEW LETTERS 2017; 119:057001. [PMID: 28949729 DOI: 10.1103/physrevlett.119.057001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/08/2016] [Indexed: 06/07/2023]
Abstract
We study the electronic structure of HgBa_{2}Ca_{2}Cu_{3}O_{8+δ} (Hg1223; T_{c}=134 K) using photoemission spectroscopy (PES) and x-ray absorption spectroscopy (XAS). Resonant valence band PES across the O K edge and Cu L edge identifies correlation satellites originating in O 2p and Cu 3d two-hole final states, respectively. Analyses using the experimental O 2p and Cu 3d partial density of states show quantitatively different on-site Coulomb energy for the Cu site (U_{dd}=6.5±0.5 eV) and O site (U_{pp}=1.0±0.5 eV). Cu_{2}O_{7}-cluster calculations with nonlocal screening explain the Cu 2p core level PES and Cu L-edge XAS spectra, confirm the U_{dd} and U_{pp} values, and provide evidence for the Zhang-Rice singlet state in Hg1223. In contrast to other hole-doped cuprates and 3d-transition metal oxides, the present results indicate weakly correlated oxygen holes in Hg1223.
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Affiliation(s)
- A Chainani
- RIKEN SPring-8 Centre, 1-1-1 Sayo-cho, Hyogo 679-5148, Japan
- Institut Jean Lamour, Université de Lorraine, UMR 7198 CNRS, BP70239, 54506 Vandoeuvre lés Nancy, France
| | - M Sicot
- Institut Jean Lamour, Université de Lorraine, UMR 7198 CNRS, BP70239, 54506 Vandoeuvre lés Nancy, France
| | - Y Fagot-Revurat
- Institut Jean Lamour, Université de Lorraine, UMR 7198 CNRS, BP70239, 54506 Vandoeuvre lés Nancy, France
| | - G Vasseur
- Institut Jean Lamour, Université de Lorraine, UMR 7198 CNRS, BP70239, 54506 Vandoeuvre lés Nancy, France
| | - J Granet
- Institut Jean Lamour, Université de Lorraine, UMR 7198 CNRS, BP70239, 54506 Vandoeuvre lés Nancy, France
| | - B Kierren
- Institut Jean Lamour, Université de Lorraine, UMR 7198 CNRS, BP70239, 54506 Vandoeuvre lés Nancy, France
| | - L Moreau
- Institut Jean Lamour, Université de Lorraine, UMR 7198 CNRS, BP70239, 54506 Vandoeuvre lés Nancy, France
| | - M Oura
- RIKEN SPring-8 Centre, 1-1-1 Sayo-cho, Hyogo 679-5148, Japan
| | - A Yamamoto
- Strong Correlation Physics Division, RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan
| | - Y Tokura
- Strong Correlation Physics Division, RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan
| | - D Malterre
- Institut Jean Lamour, Université de Lorraine, UMR 7198 CNRS, BP70239, 54506 Vandoeuvre lés Nancy, France
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