scholarly journals Order, disorder, and tunable gaps in the spectrum of Andreev bound states in a multiterminal superconducting device

2017 ◽  
Vol 95 (4) ◽  
Author(s):  
Tomohiro Yokoyama ◽  
Johannes Reutlinger ◽  
Wolfgang Belzig ◽  
Yuli V. Nazarov
Keyword(s):  
Bound States ◽  
Andreev Bound States ◽  
Superconducting Device

scholarly journals Conductance asymmetries in mesoscopic superconducting devices due to finite bias

2021 ◽  
Vol 10 (2) ◽  
Author(s):  
André Melo ◽  
Chun-Xiao Liu ◽  
Piotr Rożek ◽  
Tómas Örn Rosdahl ◽  
Michael Wimmer
Keyword(s):  
Bound States ◽  
Voltage Dependence ◽  
Superconducting Devices ◽  
Scattering Matrix ◽  
Tunnel Barrier ◽  
Tunneling Conductance ◽  
Physical Origin ◽  
Andreev Bound States ◽  
Superconducting Device ◽  
Symmetry Relations

Tunneling conductance spectroscopy in normal metal-superconductor junctions is an important tool for probing Andreev bound states in mesoscopic superconducting devices, such as Majorana nanowires. In an ideal superconducting device, the subgap conductance obeys specific symmetry relations, due to particle-hole symmetry and unitarity of the scattering matrix. However, experimental data often exhibits deviations from these symmetries or even their explicit breakdown. In this work, we identify a mechanism that leads to conductance asymmetries without quasiparticle poisoning. In particular, we investigate the effects of finite bias and include the voltage dependence in the tunnel barrier transparency, finding significant conductance asymmetries for realistic device parameters. It is important to identify the physical origin of conductance asymmetries: in contrast to other possible mechanisms such as quasiparticle poisoning, finite-bias effects are not detrimental to the performance of a topological qubit. To that end we identify features that can be used to experimentally determine whether finite-bias effects are the source of conductance asymmetries.

scholarly journals Andreev bound states in ferromagnet-superconductor nanostructures

2003 ◽  
Vol 387 (1-2) ◽  
pp. 7-12 ◽  
Author(s):  
M. Krawiec ◽  
B.L. Györffy ◽  
J.F. Annett
Keyword(s):  
Bound States ◽  
Andreev Bound States

scholarly journals Fundamental dissipation due to bound fermions in the zero-temperature limit

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
S. Autti ◽  
S. L. Ahlstrom ◽  
R. P. Haley ◽  
A. Jennings ◽  
G. R. Pickett ◽  
...  
Keyword(s):  
Critical Velocity ◽  
Ground State ◽  
Bound States ◽  
Bound State ◽  
Temperature Limit ◽  
Pair Breaking ◽  
Zero Temperature ◽  
Andreev Bound States ◽  
Macroscopic Object

Abstract The ground state of a fermionic condensate is well protected against perturbations in the presence of an isotropic gap. Regions of gap suppression, surfaces and vortex cores which host Andreev-bound states, seemingly lift that strict protection. Here we show that in superfluid 3He the role of bound states is more subtle: when a macroscopic object moves in the superfluid at velocities exceeding the Landau critical velocity, little to no bulk pair breaking takes place, while the damping observed originates from the bound states covering the moving object. We identify two separate timescales that govern the bound state dynamics, one of them much longer than theoretically anticipated, and show that the bound states do not interact with bulk excitations.

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