Details
| Original language | English |
|---|---|
| Article number | 157701 |
| Journal | Physical review letters |
| Volume | 125 |
| Issue number | 15 |
| Publication status | Published - Oct 2020 |
| Externally published | Yes |
Abstract
We study superconducting quantum interference in a Josephson junction linked via edge states in two-dimensional (2D) insulators. We consider two scenarios in which the 2D insulator is either a topological or a trivial insulator supporting one-dimensional (1D) helical or nonhelical edge states, respectively. In equilibrium, we find that the qualitative dependence of critical supercurrent on the flux through the junction is insensitive to the helical nature of the mediating states and can, therefore, not be used to verify the topological features of the underlying insulator. However, upon applying a finite voltage bias smaller than the superconducting gap to a relatively long junction, the finite-frequency interference pattern in the nonequilibrium transport current is qualitatively different for helical edge states as compared to nonhelical ones.
ASJC Scopus subject areas
- Physics and Astronomy(all)
- General Physics and Astronomy
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In: Physical review letters, Vol. 125, No. 15, 157701, 10.2020.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Superconducting Quantum Interference in Edge State Josephson Junctions
AU - Haidekker Galambos, Tamás
AU - Hoffman, Silas
AU - Recher, Patrik
AU - Klinovaja, Jelena
AU - Loss, Daniel
N1 - Funding information: We are grateful for fruitful discussions with A. Geresdi, D. Miserev, C. Reeg, M. Thakurathi, F. Schulz, O. Dmytruk, V. Chua, and P. Aseev. T. H. G. acknowledges support from the “Quantum Computing and Quantum Technologies” Ph.D. School of the University of Basel. This work was supported by the Swiss National Science Foundation and NCCR QSIT. This project received funding from the European Unions Horizon 2020 research and innovation program (ERC Starting Grant, grant Agreement No. 757725). P. R. acknowledges funding from the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany’s Excellence Strategy—EXC-2123 QuantumFrontiers—390837967.
PY - 2020/10
Y1 - 2020/10
N2 - We study superconducting quantum interference in a Josephson junction linked via edge states in two-dimensional (2D) insulators. We consider two scenarios in which the 2D insulator is either a topological or a trivial insulator supporting one-dimensional (1D) helical or nonhelical edge states, respectively. In equilibrium, we find that the qualitative dependence of critical supercurrent on the flux through the junction is insensitive to the helical nature of the mediating states and can, therefore, not be used to verify the topological features of the underlying insulator. However, upon applying a finite voltage bias smaller than the superconducting gap to a relatively long junction, the finite-frequency interference pattern in the nonequilibrium transport current is qualitatively different for helical edge states as compared to nonhelical ones.
AB - We study superconducting quantum interference in a Josephson junction linked via edge states in two-dimensional (2D) insulators. We consider two scenarios in which the 2D insulator is either a topological or a trivial insulator supporting one-dimensional (1D) helical or nonhelical edge states, respectively. In equilibrium, we find that the qualitative dependence of critical supercurrent on the flux through the junction is insensitive to the helical nature of the mediating states and can, therefore, not be used to verify the topological features of the underlying insulator. However, upon applying a finite voltage bias smaller than the superconducting gap to a relatively long junction, the finite-frequency interference pattern in the nonequilibrium transport current is qualitatively different for helical edge states as compared to nonhelical ones.
UR - http://www.scopus.com/inward/record.url?scp=85093362190&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.125.157701
DO - 10.1103/PhysRevLett.125.157701
M3 - Article
C2 - 33095622
AN - SCOPUS:85093362190
VL - 125
JO - Physical review letters
JF - Physical review letters
SN - 0031-9007
IS - 15
M1 - 157701
ER -