Hybrid quantum circuits in vertical magnetic fields

Delfanazari, K., Serra, L., Ma, P., Farrer, I., Ritchie, D. A., Joyce, H. J., Kelly, M. J. and Smith, C. G. (2020) Hybrid quantum circuits in vertical magnetic fields. APS March Meeting 2020, Denver, Colorado, USA, 2-6 March 2020.

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Publisher's URL: https://meetings.aps.org/Meeting/MAR20/Session/R60.3

Abstract

Topological superconductors, that host Majorana zero modes and parafermions, can also be realized at the interface of superconductivity and the quantum Hall states in hybrid superconductor-semiconductor devices. Here, we present (i) two types of artificially engineered hybrid Josephson circuits fabrication methods, and (ii) sub-Kelvin temperature- dependent transport measurements at low and high magnetic fields B. We experimentally demonstrate that the 2D Josephson junctions and field-effect transistors under vertical magnetic fields show (i) an unusual magnetoconductance oscillations together with asymmetric dI/dV curves at B < 100 mT, (ii) Superconducting correlation on quantum Hall states at B up to 6 T, respectively. Our experimental results are qualitatively explained by a model considering the trivial and topological phase transitions in hybrid 2D Josephson junctions in vertical fields.

Item Type:Conference or Workshop Item
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Delfanazari, Dr Kaveh
Authors: Delfanazari, K., Serra, L., Ma, P., Farrer, I., Ritchie, D. A., Joyce, H. J., Kelly, M. J., and Smith, C. G.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering

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