4π-periodic Josephson supercurrent in HgTe-based topological Josephson junctions

Nature Communications
J WiedenmannLaurens W Molenkamp

Abstract

The Josephson effect describes the generic appearance of a supercurrent in a weak link between two superconductors. Its exact physical nature deeply influences the properties of the supercurrent. In recent years, considerable efforts have focused on the coupling of superconductors to the surface states of a three-dimensional topological insulator. In such a material, an unconventional induced p-wave superconductivity should occur, with a doublet of topologically protected gapless Andreev bound states, whose energies vary 4π-periodically with the superconducting phase difference across the junction. In this article, we report the observation of an anomalous response to rf irradiation in a Josephson junction made of a HgTe weak link. The response is understood as due to a 4π-periodic contribution to the supercurrent, and its amplitude is compatible with the expected contribution of a gapless Andreev doublet. Our work opens the way to more elaborate experiments to investigate the induced superconductivity in a three-dimensional insulator.

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Citations

Nov 1, 2016·Nature Nanotechnology·Erwann BocquillonLaurens W Molenkamp
Mar 31, 2017·Nano Letters·Önder GülLeo P Kouwenhoven
Feb 22, 2018·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Zhen-Tao Zhang
Jul 18, 2017·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Abdullah YarKashif Sabeeh
Apr 4, 2017·Reports on Progress in Physics·Masatoshi Sato, Yoichi Ando
Feb 15, 2019·Scientific Reports·Joachim SchönleWolfgang Wernsdorfer
Jul 7, 2018·Beilstein Journal of Nanotechnology·Pasquale MarraRoberta Citro
May 21, 2016·Science·F AmetG Finkelstein
Feb 25, 2020·Advanced Materials·Martin P StehnoAlexander Brinkman
May 15, 2018·Physical Review Letters·W YuF Zhang
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Sep 19, 2018·Nature Materials·Fan Zhang, Wei Pan
Apr 25, 2020·Nanomaterials·Bob de RondeAlexander Brinkman
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Jan 21, 2021·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Adithi UdupaDiptiman Sen
Nov 17, 2020·Physical Review Letters·Sunghun ParkPatrik Recher
Jan 30, 2021·Physical Review Letters·Cai-Zhen LiZhi-Min Liao
Apr 25, 2021·Advanced Materials·Michael S LodgeBent Weber
Jun 25, 2021·Science Advances·Daniel RosenbachThomas Schäpers
Apr 15, 2020·ACS Nano·An-Qi WangZhi-Min Liao
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Jul 6, 2018·Nano Letters·Kalle BendiasLaurens W Molenkamp
Sep 10, 2020·Nano Letters·Trevyn F Q LarsonGleb Finkelstein
Aug 28, 2021·Nanomaterials·Razmik A HovhannisyanVladimir M Krasnov

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Methods Mentioned

BETA
scanning electron microscopy

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