Andreev Reflection in an s-Type Superconductor Proximized 3D Topological Insulator
E. S. Tikhonov, D. V. Shovkun, M. Snelder, M. P. Stehno, Y. Huang, M. S. Golden, A. A. Golubov, A. Brinkman, V. S. Khrapai
DOI 10.1103/PhysRevLett.117.147001 · Physical Review Letters
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
We investigate transport and shot noise in lateral normal-metal–3D topological-insulator–superconductor contacts, where the 3D topological insulator (TI) is based on Bi. In the normal state, the devices are in the elastic diffusive transport regime, as demonstrated by a nearly universal value of the shot noise Fano factor FN≈1/3 in magnetic field and in a reference normal-metal 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 FAR≈0.22±0.02 is considerably reduced in the AR regime compared to FN, 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8.4 | Pressure not reported | onset |
Similar papers
Inhomogeneous Superconductivity Induced in a Ferromagnet by Proximity Effect
similarity 0.93T. Kontos et al.
Source status unknown — claims are unverified
Andreev reflection in ferrimagnetic CoFe2O4 spin filters
similarity 0.93Franco Rigato et al.
Source status unknown — claims are unverified
Mesoscopic Fluctuations of the Critical Current in a Superconductor—Normal-Conductor—Superconductor
similarity 0.92Hideaki Takayanagi et al.
Source status unknown — claims are unverified
Magnetization-Dependent Tc Shift in Ferromagnet/Superconductor/Ferromagnet Trilayers with a Strong Ferromagnet
similarity 0.92Ion C. Moraru et al.
Source status unknown — claims are unverified
Impact of geometry on flux trapping and the related surface resistance in a superconducting cavity
similarity 0.92Felix Kramer et al.
Source status unknown — claims are unverified
Superconductivity and electrical properties in single-crystalline ultrathin Nb films grown by molecular-beam epitaxy
similarity 0.92K. Yoshii et al.
Source status unknown — claims are unverified