Topological superconductivity in twisted 2D structures
department or school: Science, Faculty of
department or school: Physics and Astronomy, Department of
data provider: DSpace
degree campus: UBCV
creator: Tummuru, Tarun Reddy
issued: 2023-02-08T23:43:51Z
issued: 2023
related degree: Doctor of Philosophy - PhD
degree grantor: University of British Columbia
description: The notion of twisting and stacking two-dimensional van der Waals materials has emerged as a paradigm for realizing novel electronic states. With the goal of engineering topological superconductivity, we go beyond the archetypal example of twisted bilayer graphene and consider structures composed of proximitized quantum wires and high-Tc cuprate superconductors. On the basis of symmetry arguments, backed by microscopic modeling, these setups are predicted to spontaneously break time-reversal symmetry and give rise to topological p- and d-wave phases with chiral Majorana edge modes. Given the experimental pertinence, we investigate a suite of Josephson transport phenomena in twisted cuprate bilayers and identify signatures of the topological phase. Further, the analysis is extended to twisted multilayers where the occurrence of higher-order band crossings makes the groundstate susceptible to secondary instabilities and topological superconductivity appears for an extended range of twists.
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/83814
note: Topological superconductivityin twisted 2D structuresbyTarun Reddy TummuruB.Sc., Shiv Nadar University, 2017M.Sc., The University of British Columbia, 2019A THESIS SUBMITTED IN PARTIAL FULFILLMENT OFTHE REQUIREMENTS FOR THE DEGREE OFDOCTOR OF PHILOSOPHYinThe Faculty of Graduate and Postdoctoral Studies(Physics)THE UNIVERSITY OF BRITISH COLUMBIA(Vancouver)February 2023© Tarun Reddy Tummuru 2023The following individuals certify that they have read, and recommend to the Faculty ofGraduate and Postdoctoral Studies for acceptance, the thesis entitled:Topological superconductivity in twisted 2D structuressubmitted by Tarun Reddy Tummuru in partial fulfillment of the requirements for thedegree of Doctor of Philosophy in Physics.Examining Committee:Marcel Franz, Professor, Physics and Astronomy, UBCSupervisorDouglas Bonn, Professor, Physics and Astronomy, UBCUniversity ExaminerRoman Krems, Professor, Chemistry, UBCUniversity ExaminerMoshe Rozali, Professor, Physics and Astronomy, UBCSupervisory Committee MemberAdditional Supervisory Committee:Ziliang Ye, Assistant Professor, Physics and Astronomy, UBCSupervisory Committee MemberAndrew Potter, Assistant Professor, Physics and Astronomy, UBCSupervisory Committee MemberiiAbstractThe notion of twisting and stacking two-dimensional van der Waals materials has emergedas a paradigm for realizing novel electronic states. With the goal of engineering topologicalsuperconductivity, we go beyond the archetypal example of twisted bilayer grapheneand consider structures composed of proximitized quantum wires and high-Tc cupratesuperconductors. On the basis of symmetry arguments, backed by microscopic modeling,these setups are predicted to spontaneously break time-reversal symmetry and give rise totopological p- and d-wave phases with chiral Majorana edge modes. Given the experimentalpertinence, we investigate a suite of Josephson transport phenomena in twisted cupratebilayers and identify signatures of the topological phase. Further, the…
has type: Thesis/Dissertation
date issued: 2023-05
is shown at: 10.14288/1.0424307
language: eng
degree discipline: Physics
provider: Vancouver : University of British Columbia Library
publisher: University of British Columbia
rights: Attribution-NonCommercial-NoDerivatives 4.0 International
rights URI: http://creativecommons.org/licenses/by-nc-nd/4.0/
scholar level: Graduate
contributor: Franz, Marcel
type: Text
identifier URI: http://hdl.handle.net/2429/83814