ABC Physics Seminar
This event is in the past.
Date: February 16, 2021
Time: 3:30 p.m. - 4:30 p.m.
Topic: ABC Physics Seminar
Time: Feb 16, 2021 03:15 PM Eastern Time (US and Canada)
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Meeting ID: 940 0459 1943
TITLE: Crystalline Anisotropic Topological Superconductivity in Planar Josephson Junctions
SPEAKER: Joseph Pakizer
ABSTRACT: We theoretically investigate the crystalline anisotropy of topological phase transitions in phase-
controlled planar Josephson junctions (JJs) subject to spin-orbit coupling and in-plane magnetic
fields. It is shown how topological superconductivity (TS) is affected by the interplay between the
magnetic field and the orientation of the junction with respect to its crystallographic axes. This
interplay can be used to electrically tune between BDI and D symmetry classes in a controlled fashion
and thereby optimize the stability and localization of Majorana bound states in planar Josephson
junctions. Our findings can be used as a guide for achieving the most favorable conditions when
engineering TS in planar JJs and can be particularly relevant for setups containing non-collinearjunctions which have been proposed for performing braiding operations on multiple Majorana pairs.
TITLE: Designing Quantum States in Two-Dimensional Systems by Reconfiguring Local Magnetic Proximity Fields
SPEAKER: Siphiwo R. Dlamini
ABSTRACT: We theoretically investigate the effects of local, magnetic proximity fields generated by arrays of magnetic nanopillars (MNs) next to two-dimensional (2D) systems such as semiconductor quantum wells and 2D van der Waals crystals. The magnetic landscape generated by the MNs can be reconfigured on the nanometer scale by electrically switching the magnetic state of individual nanopillars. The interaction of carriers’ spin with the magnetic proximity field leads to sizable changes in the transport properties of the adjacent 2D system. Furthermore, the local magnetic proximity fields can also induce the formation of new quantum states in the 2D system, enabling the magnetic control and manipulation of quantum states. The versatile functionalities of the proposed system could be used for designing novel quantum and spintronic devices.