Andreev reflection and bound states in topological insulator based planar and step Josephson junctions

2017 ◽  
Vol 85 ◽  
pp. 238-247 ◽  
Author(s):  
Tarun Choudhari ◽  
Nivedita Deo
Keyword(s):  
Topological Insulator ◽  
Josephson Junctions ◽  
Bound States ◽  
Andreev Reflection

Suppressed Andreev reflection and helical Andreev bound states in triplet superconductor three-dimensional topological insulator

2015 ◽  
Vol 29 (04) ◽  
pp. 1550018 ◽  
Author(s):  
M. Khezerlou ◽  
H. Goudarzi
Keyword(s):  
Topological Insulator ◽  
Bound States ◽  
Andreev Reflection ◽  
Chemical Potential ◽  
Three Dimensional ◽  
P Wave ◽  
Superconducting Gap ◽  
Tunneling Conductance ◽  
Andreev Bound States ◽  
Josephson Supercurrent

Effect of proximity-induced unconventional p-wave superconductivity in a three-dimensional topological insulator-based S/F/S structure on the Andreev bound states (ABSs) and Josephson supercurrent is studied. We investigate, in detail, the suppression of Andreev reflection and helical ABSs in the presence of three types of triplet superconducting gap. The magnetization of ferromagnetic section is perpendicular to the surface of junction. The influence of such features on the supercurrent flow on the surface of the topological insulator is studied. We carry out our goal by introducing a relevant form of Dirac spinors for gapless renormalized by chemical potential μ excitation states. Therefore, it enables us to consider the virtual Andreev process, simultaneously, and we propose to investigate it in a tunneling conductance junction. It is shown that the results obtained in this case are completely different from those in conventional superconductivity, as s- or d-waves, for example, the magnetization is found to decrease the gap for px and px+ipy case, whereas increase it for py order. Strongly suppressed Andreev reflection is demonstrated.

scholarly journals TOPOLOGICAL INSULATOR AND THE DIRAC EQUATION

SPIN ◽  
2011 ◽  
Vol 01 (01) ◽  
pp. 33-44 ◽  
Author(s):  
SHUN-QING SHEN ◽  
WEN-YU SHAN ◽  
HAI-ZHOU LU
Keyword(s):  
Dirac Equation ◽  
Topological Insulator ◽  
Bound States ◽  
Topological Insulators ◽  
Mass Term ◽  
Point Of View ◽  
Quadratic Term ◽  
General Description ◽  
Dirac Equations ◽  
Topological Quantum

We present a general description of topological insulators from the point of view of Dirac equations. The Z2 index for the Dirac equation is always zero, and thus the Dirac equation is topologically trivial. After the quadratic term in momentum is introduced to correct the mass term m or the band gap of the Dirac equation, i.e., m → m − Bp2, the Z2 index is modified as 1 for mB > 0 and 0 for mB < 0. For a fixed B there exists a topological quantum phase transition from a topologically trivial system to a nontrivial system when the sign of mass m changes. A series of solutions near the boundary in the modified Dirac equation is obtained, which is characteristic of topological insulator. From the solutions of the bound states and the Z2 index we establish a relation between the Dirac equation and topological insulators.

scholarly journals Crossed Andreev reflection in InSb flake Josephson junctions

2019 ◽  
Vol 1 (3) ◽  
Author(s):  
Folkert K. de Vries ◽  
Martijn L. Sol ◽  
Sasa Gazibegovic ◽  
Roy L. M. op het Veld ◽  
Stijn C. Balk ◽  
...  
Keyword(s):  
Josephson Junctions ◽  
Andreev Reflection ◽  
Crossed Andreev Reflection

scholarly journals Anomalous Fraunhofer Patterns in Gated Josephson Junctions Based on the Bulk-Insulating Topological Insulator BiSbTeSe2

Nano Letters ◽  
2018 ◽  
Vol 18 (8) ◽  
pp. 5124-5131 ◽  
Author(s):  
Subhamoy Ghatak ◽  
Oliver Breunig ◽  
Fan Yang ◽  
Zhiwei Wang ◽  
Alexey A. Taskin ◽  
...  
Keyword(s):  
Topological Insulator ◽  
Josephson Junctions

scholarly journals Magnetization reversal in superconductor/insulating ferromagnet/superconductor Josephson junctions on a three-dimensional topological insulator

2020 ◽  
Vol 102 (13) ◽  
Author(s):  
I. V. Bobkova ◽  
A. M. Bobkov ◽  
I. R. Rahmonov ◽  
A. A. Mazanik ◽  
K. Sengupta ◽  
...  
Keyword(s):  
Topological Insulator ◽  
Magnetization Reversal ◽  
Josephson Junctions ◽  
Three Dimensional

scholarly journals High transparency Bi2Se3 topological insulator nanoribbon Josephson junctions with low resistive noise properties

2019 ◽  
Vol 115 (17) ◽  
pp. 172601 ◽  
Author(s):  
Gunta Kunakova ◽  
Thilo Bauch ◽  
Edoardo Trabaldo ◽  
Jana Andzane ◽  
Donats Erts ◽  
...  
Keyword(s):  
Topological Insulator ◽  
Josephson Junctions ◽  
High Transparency
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