Open Access
Physical Review Letters, volume 117, issue 14, publication number 147001
Andreev Reflection in ans
Tikhonov E. S.
1, 2
,
Shovkun D.V
1, 2
,
Snelder M.
3
,
Stehno M. P.
3
,
Huang Y. D.
4
,
Golden Mark
4
,
Golubov Alexander A.
2, 3
,
Brinkman A.
3
,
Khrapai Vadim S.
1, 2
4
Van der Waals—Zeeman Institute, University of Amsterdam, 1098 XH Amsterdam, The Netherlands
|
Publication type: Journal Article
Publication date: 2016-09-28
Journal:
Physical Review Letters
Quartile SCImago
Q1
Quartile WOS
Q1
Impact factor: 8.6
ISSN: 00319007, 10797114
General Physics and Astronomy
Abstract
We investigate transport and shot noise in lateral N-TI-S contacts, where N is a normal metal, TI is a Bi-based three dimensional topological insulator (3D TI), and S is an s-type superconductor. In normal state, the devices are in the elastic diffusive transport regime, as demonstrated by a nearly universal value of the shot noise Fano factor $F_{\rm N}\approx1/3$ in magnetic field and in reference normal contact. In the absence of magnetic field, we identify the Andreev reflection (AR) regime, which gives rise to the effective charge doubling in shot noise measurements. Surprisingly, the Fano factor $F_{\rm AR}\approx0.22\pm0.02$ is considerably reduced in the AR regime compared to $F_{\rm N}$, in contrast to previous AR experiments in normal metals and semiconductors. We suggest that this effect is related to a finite thermal conduction of the proximized, superconducting TI owing to a residual density of states at low energies.
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Tikhonov E. S. et al. Andreev Reflection in ans-Type Superconductor Proximized 3D Topological Insulator // Physical Review Letters. 2016. Vol. 117. No. 14. 147001
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Tikhonov E. S., Shovkun D., Snelder M., Stehno M. P., Huang Y. D., Golden M., Golubov A. A., Brinkman A., Khrapai V. S. Andreev Reflection in ans-Type Superconductor Proximized 3D Topological Insulator // Physical Review Letters. 2016. Vol. 117. No. 14. 147001
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TY - JOUR
DO - 10.1103/PhysRevLett.117.147001
UR - https://doi.org/10.1103%2FPhysRevLett.117.147001
TI - Andreev Reflection in ans-Type Superconductor Proximized 3D Topological Insulator
T2 - Physical Review Letters
AU - Tikhonov, E. S.
AU - Shovkun, D.V
AU - Snelder, M.
AU - Stehno, M. P.
AU - Huang, Y. D.
AU - Golden, Mark
AU - Golubov, Alexander A.
AU - Brinkman, A.
AU - Khrapai, Vadim S.
PY - 2016
DA - 2016/09/28 00:00:00
PB - American Physical Society (APS)
IS - 14
VL - 117
SN - 0031-9007
SN - 1079-7114
ER -
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@article{2016_Tikhonov,
author = {E. S. Tikhonov and D.V Shovkun and M. Snelder and M. P. Stehno and Y. D. Huang and Mark Golden and Alexander A. Golubov and A. Brinkman and Vadim S. Khrapai},
title = {Andreev Reflection in ans-Type Superconductor Proximized 3D Topological Insulator},
journal = {Physical Review Letters},
year = {2016},
volume = {117},
publisher = {American Physical Society (APS)},
month = {sep},
url = {https://doi.org/10.1103%2FPhysRevLett.117.147001},
number = {14},
doi = {10.1103/PhysRevLett.117.147001}
}
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