Related papers: Experimental evidence for topological phases in the magnetoconductance of 2DEG-based hybrid junctions

Experimental evidence for topological phases in the magnetoconductance of 2DEG-based hybrid junctions

URL: http://arxiv.org/abs/2007.02057v2
Date: Sat, 8 Aug 2020 11:08:35 GMT
Title: Experimental evidence for topological phases in the magnetoconductance of 2DEG-based hybrid junctions
Authors: Kaveh Delfanazari, Llorenc Serra, Pengcheng Ma, Reuben K. Puddy, Teng Yi, Moda Cao, Yilmaz Gul, Ian Farrer, David A. Ritchie, Hannah J. Joyce, Michael J. Kelly, Charles G. Smith
Abstract summary: Majorana phases emerge as quantized plateaus in the magnetoconductance of hybrid junctions based on two-dimensional electron gases (2DEG) under fully out-of-plane magnetic fields. We report on the experimental observation of such topological phases in Josephson junctions, based on In0.75Ga0.25As 2DEG, by sweeping out-of-plane magnetic fields of as small as 0 B(mT) 100.
Score: 0.0
License: http://creativecommons.org/licenses/by/4.0/
Abstract: While the application of out-of-plane magnetic fields was, so far, believed to be detrimental for the formation of Majorana phases in artificially engineered hybrid superconducting-semiconducting junctions, several recent theoretical studies have found it indeed useful in establishing such topological phases 1-5. Majorana phases emerge as quantized plateaus in the magnetoconductance of the hybrid junctions based on two-dimensional electron gases (2DEG) under fully out-of-plane magnetic fields. The large transverse Rashba spin-orbit interaction in 2DEG, together with a strong magneto-orbital effect, yield topological phase transitions to nontrivial phases hosting Majorana modes. Such Majorana modes are formed at the ends of 2DEG-based wires with a hybrid superconductor-semiconductor integrity. Here, we report on the experimental observation of such topological phases in Josephson junctions, based on In0.75Ga0.25As 2DEG, by sweeping out-of-plane magnetic fields of as small as 0 < B(mT) < 100 and probing the conductance to highlight the characteristic quantized magnetoconductance plateaus. Our approaches towards (i) creation and detection of topological phases in small out-of-plane magnetic fields, and (ii) integration of an array of topological Josephson junctions on a single chip pave the ways for the development of scalable quantum integrated circuits for their potential applications in fault-tolerant quantum processing and computing.

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