1
|
Phase tuning of multiple Andreev reflections of Dirac fermions and the Josephson supercurrent in Al–MoTe
2
–Al junctions. Proc Natl Acad Sci U S A 2022; 119:e2204468119. [PMID: 35867759 PMCID: PMC9282224 DOI: 10.1073/pnas.2204468119] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
When an electron in a metal N is incident on the interface with a superconductor, it undergoes an Andreev reflection. A positive charge (a hole) is reflected back to N, while an electron pair (Cooper pair) is created in the superconductor. If N is sandwiched between two superconductors to form a junction, multiple Andreev reflections occur. As a result, multiple Cooper pairs are shuttled across the junction, but only a fraction of them retain phase coherence to define a supercurrent. In a Dirac semimetal, the reflections are observed with exceptional clarity. By tuning the quantum phase across the junction, we show that the supercurrent is tightly choreographed with the Andreev reflections. This allows the coherent fraction to be found. When an electron is incident on a superconductor from a metal, it is reflected as a hole in a process called Andreev reflection. If the metal N is sandwiched between two superconductors S in an SNS junction, multiple Andreev reflections (MARs) occur. We have found that, in SNS junctions with high transparency (τ → 1) based on the Dirac semimetal MoTe2, the MAR features are observed with exceptional resolution. By tuning the phase difference φ between the bracketing Al superconductors, we establish that the MARs coexist with a Josephson supercurrent Is=IA sinφ. As we vary the junction voltage V, the supercurrent amplitude IA varies in step with the MAR order n, revealing a direct relation between them. Two successive Andreev reflections serve to shuttle a Cooper pair across the junction. If the pair is shuttled coherently, it contributes to Is. The experiment measures the fraction of pairs shuttled coherently vs. V. Surprisingly, superconductivity in MoTe2 does not affect the MAR features.
Collapse
|
2
|
Tailoring supercurrent confinement in graphene bilayer weak links. Nat Commun 2018; 9:1722. [PMID: 29712916 PMCID: PMC5928064 DOI: 10.1038/s41467-018-04153-4] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2017] [Accepted: 04/11/2018] [Indexed: 11/08/2022] Open
Abstract
The Josephson effect is one of the most studied macroscopic quantum phenomena in condensed matter physics and has been an essential part of the quantum technologies development over the last decades. It is already used in many applications such as magnetometry, metrology, quantum computing, detectors or electronic refrigeration. However, developing devices in which the induced superconductivity can be monitored, both spatially and in its magnitude, remains a serious challenge. In this work, we have used local gates to control confinement, amplitude and density profile of the supercurrent induced in one-dimensional nanoscale constrictions, defined in bilayer graphene-hexagonal boron nitride van der Waals heterostructures. The combination of resistance gate maps, out-of-equilibrium transport, magnetic interferometry measurements, analytical and numerical modelling enables us to explore highly tunable superconducting weak links. Our study opens the path way to design more complex superconducting circuits based on this principle, such as electronic interferometers or transition-edge sensors.
Collapse
|
3
|
Pal S, Benjamin C. Tuning the 0 - π Josephson junction with a magnetic impurity: Role of tunnel contacts, exchange coupling, e - e interactions and high-spin states. Sci Rep 2018; 8:5208. [PMID: 29581475 PMCID: PMC5979961 DOI: 10.1038/s41598-018-23517-w] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2017] [Accepted: 03/14/2018] [Indexed: 11/16/2022] Open
Abstract
We propose Josephson junction with a high-spin magnetic impurity sandwiched between two superconductors. This system shows a π junction behavior as a function of the spin magnetic moment state of the impurity, the interface transparency, exchange coupling and electron-electron interactions in the system. The system is theoretically analyzed for possible reason behind the π shift. The crucial role of spin flip scattering is highlighted. Possible applications in quantum computation of our proposed tunable high spin magnetic impurity π junction is underscored.
Collapse
Affiliation(s)
- Subhajit Pal
- School of Physical Sciences, National Institute of Science Education & Research, HBNI, Jatni, 752050, India
| | - Colin Benjamin
- School of Physical Sciences, National Institute of Science Education & Research, HBNI, Jatni, 752050, India.
| |
Collapse
|
4
|
Jung M, Noh H, Doh YJ, Song W, Chong Y, Choi MS, Yoo Y, Seo K, Kim N, Woo BC, Kim B, Kim J. Superconducting junction of a single-crystalline au nanowire for an ideal Josephson device. ACS NANO 2011; 5:2271-2276. [PMID: 21355535 DOI: 10.1021/nn1035679] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
We report on the fabrication and measurements of a superconducting junction of a single-crystalline Au nanowire, connected to Al electrodes. The current-voltage characteristic curve shows a clear supercurrent branch below the superconducting transition temperature of Al and quantized voltage plateaus on application of microwave radiation, as expected from Josephson relations. Highly transparent (0.95) contacts very close to an ideal limit of 1 are formed at the interface between the normal metal (Au) and the superconductor (Al). The very high transparency is ascribed to the single crystallinity of a Au nanowire and the formation of an oxide-free contact between Au and Al. The subgap structures of the differential conductance are well explained by coherent multiple Andreev reflections (MAR), the hallmark of mesoscopic Josephson junctions. These observations demonstrate that single crystalline Au nanowires can be employed to develop novel quantum devices utilizing coherent electrical transport.
Collapse
Affiliation(s)
- Minkyung Jung
- Korea Research Institute of Standards and Science, Daejeon 305-600, Korea
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
5
|
Dolcini F, Rainis D, Taddei F, Polini M, Fazio R, Macdonald AH. Blockade and counterflow supercurrent in exciton-condensate Josephson junctions. PHYSICAL REVIEW LETTERS 2010; 104:027004. [PMID: 20366620 DOI: 10.1103/physrevlett.104.027004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/04/2009] [Indexed: 05/29/2023]
Abstract
We demonstrate that perfect conversion between charged supercurrents in superconductors and neutral supercurrents in electron-hole pair condensates is possible via a new Andreev-like scattering mechanism. As a result, when two superconducting circuits are coupled through a bilayer exciton condensate, the superflow in both layers is drastically modified. Depending on the phase biases the supercurrents can be completely blocked or exhibit perfect drag.
Collapse
|
6
|
Reynoso AA, Usaj G, Balseiro CA, Feinberg D, Avignon M. Anomalous Josephson current in junctions with spin polarizing quantum point contacts. PHYSICAL REVIEW LETTERS 2008; 101:107001. [PMID: 18851244 DOI: 10.1103/physrevlett.101.107001] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2008] [Indexed: 05/26/2023]
Abstract
We consider a ballistic Josephson junction with a quantum point contact in a two-dimensional electron gas with Rashba spin-orbit coupling. The point contact acts as a spin filter when embedded in a circuit with normal electrodes. We show that with an in-plane external magnetic field an anomalous supercurrent appears even for zero phase difference between the superconducting electrodes. In addition, the external field induces large critical current asymmetries between the two flow directions, leading to supercurrent rectifying effects.
Collapse
Affiliation(s)
- A A Reynoso
- Instituto Balseiro, Centro Atómico Bariloche, Río Negro, Argentina
| | | | | | | | | |
Collapse
|
7
|
Krive IV, Romanovsky IA, Bogachek EN, Landman U. Phase-controlled force and magnetization oscillations in superconducting ballistic nanowires. PHYSICAL REVIEW LETTERS 2004; 92:126802. [PMID: 15089697 DOI: 10.1103/physrevlett.92.126802] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/17/2003] [Indexed: 05/24/2023]
Abstract
The emergence of superconductivity-induced phase-controlled forces in the (10(-2)-10(-1)) nN range and of magnetization oscillations in nanowire junctions is discussed. A giant magnetic response to applied weak magnetic fields is predicted in the ballistic Josephson junction formed by a superconducting tip and a surface, bridged by a normal-metal nanowire where Andreev states form.
Collapse
Affiliation(s)
- I V Krive
- School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332-0430, USA
| | | | | | | |
Collapse
|
8
|
Riedel RA, Chang LF, Bagwell PF. Critical current and self-consistent order parameter of a superconductor-normal-metal-superconductor junction. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:16082-16095. [PMID: 9985682 DOI: 10.1103/physrevb.54.16082] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
9
|
Chang LF, Chaudhuri S, Bagwell PF. Critical current of a quasi-one-dimensional superconducting wire. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:9399-9407. [PMID: 9984677 DOI: 10.1103/physrevb.54.9399] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
10
|
Hurd M, Datta S, Bagwell PF. Current-voltage relation for asymmetric ballistic superconducting junctions. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:6557-6567. [PMID: 9986673 DOI: 10.1103/physrevb.54.6557] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
11
|
Claughton NR, Lambert CJ. Thermoelectric properties of mesoscopic superconductors. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 53:6605-6612. [PMID: 9982062 DOI: 10.1103/physrevb.53.6605] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
12
|
Fazio R, Hekking FW, Odintsov AA. dc and ac Josephson effect in a superconductor-Luttinger-liquid-superconductor system. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 53:6653-6664. [PMID: 9982068 DOI: 10.1103/physrevb.53.6653] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
13
|
Vakhnenko OO. Spectral and transport characteristics of an arbitrarily bent planar quantum electron guide. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 52:17386-17392. [PMID: 9981168 DOI: 10.1103/physrevb.52.17386] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
14
|
Takayanagi H, Akazaki T, Nitta J. Observation of maximum supercurrent quantization in a superconducting quantum point contact. PHYSICAL REVIEW LETTERS 1995; 75:3533-3536. [PMID: 10059610 DOI: 10.1103/physrevlett.75.3533] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
|
15
|
Takayanagi H, Akazaki T. Andreev reflection at the superconductor-two-dimensional-electron-gas interface by a quantum point contact. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 52:R8633-R8636. [PMID: 9979912 DOI: 10.1103/physrevb.52.r8633] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
16
|
Claughton NR, Hui VC, Lambert CJ. Theory of anomalous proximity effects in phase-coherent structures. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 51:11635-11646. [PMID: 9977899 DOI: 10.1103/physrevb.51.11635] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
17
|
Fazio R, Hekking FW, Odintsov AA. Josephson current through a Luttinger liquid. PHYSICAL REVIEW LETTERS 1995; 74:1843-1846. [PMID: 10057771 DOI: 10.1103/physrevlett.74.1843] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
|
18
|
Martín-Rodero A, García-Vidal FJ. Self-consistent theory of superconducting mesoscopic weak links. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 51:3743-3753. [PMID: 9979191 DOI: 10.1103/physrevb.51.3743] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
19
|
Takayanagi H, Nitta J. Mesoscopic fluctuations of the critical current in a superconductor-normal-conductor-superconductor. PHYSICAL REVIEW LETTERS 1995; 74:166-169. [PMID: 10057725 DOI: 10.1103/physrevlett.74.166] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
|
20
|
Takayanagi H, Akazaki T, Nitta J. Interference effects on the critical current in a clean-limit superconductor-normal-metal-superconductor junction. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 51:1374-1377. [PMID: 9978309 DOI: 10.1103/physrevb.51.1374] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
21
|
Xu JH, Shen JL, Miller JH, Ting CS. Josephson effect in unconventional superconducting contacts. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 50:16762-16765. [PMID: 9976071 DOI: 10.1103/physrevb.50.16762] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
22
|
Hurd M, Wendin G. Andreev level spectrum and Josephson current in a superconducting ballistic point contact. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 49:15258-15262. [PMID: 10010635 DOI: 10.1103/physrevb.49.15258] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
23
|
Sols F, Ferrer J. Crossover from the Josephson effect to bulk superconducting flow. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 49:15913-15919. [PMID: 10010725 DOI: 10.1103/physrevb.49.15913] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
24
|
Nitta J, Akazaki T, Takayanagi H. Magnetic-field dependence of Andreev reflection in a clean Nb-InAs-Nb junction. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 49:3659-3662. [PMID: 10011250 DOI: 10.1103/physrevb.49.3659] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
25
|
Martín-Rodero A, García-Vidal FJ. Microscopic theory of Josephson mesoscopic constrictions. PHYSICAL REVIEW LETTERS 1994; 72:554-557. [PMID: 10056462 DOI: 10.1103/physrevlett.72.554] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
|
26
|
Lambert CJ, Robinson SJ. Macroscopic fluctuations in the boundary resistance of metal-superconductor interfaces. PHYSICAL REVIEW. B, CONDENSED MATTER 1993; 48:10391-10394. [PMID: 10007316 DOI: 10.1103/physrevb.48.10391] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
27
|
Klapwijk TM, Heslinga DR. Carrier transport in mesoscopic silicon-coupled superconducting junctions. PHYSICAL REVIEW. B, CONDENSED MATTER 1993; 47:5170-5189. [PMID: 10006683 DOI: 10.1103/physrevb.47.5170] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
28
|
Nitta J, Akazaki T, Takayanagi H, Arai K. Transport properties in an InAs-inserted-channel In0.52Al0.48As/In0.53Ga0.47As heterostructure coupled superconducting junction. PHYSICAL REVIEW. B, CONDENSED MATTER 1992; 46:14286-14289. [PMID: 10003520 DOI: 10.1103/physrevb.46.14286] [Citation(s) in RCA: 72] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
29
|
Bagwell PF. Suppression of the Josephson current through a narrow, mesoscopic, semiconductor channel by a single impurity. PHYSICAL REVIEW. B, CONDENSED MATTER 1992; 46:12573-12586. [PMID: 10003178 DOI: 10.1103/physrevb.46.12573] [Citation(s) in RCA: 127] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
30
|
Furusaki A, Takayanagi H, Tsukada M. Josephson effect of the superconducting quantum point contact. PHYSICAL REVIEW. B, CONDENSED MATTER 1992; 45:10563-10575. [PMID: 10000963 DOI: 10.1103/physrevb.45.10563] [Citation(s) in RCA: 50] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
31
|
|
32
|
|
33
|
Klapwijk TM. Nonequilibrium carrier transport in superconducting niobium-silicon heterostructures. PHYSICAL REVIEW. B, CONDENSED MATTER 1992; 45:535-538. [PMID: 10000223 DOI: 10.1103/physrevb.45.535] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
34
|
Beenakker CW. Universal limit of critical-current fluctuations in mesoscopic Josephson junctions. PHYSICAL REVIEW LETTERS 1991; 67:3836-3839. [PMID: 10044838 DOI: 10.1103/physrevlett.67.3836] [Citation(s) in RCA: 96] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
|