Topological superconductivity in twisted cuprates and device applications inspired by their Josephson physics
department or school: Science, Faculty of
department or school: Physics and Astronomy, Department of
data provider: DSpace
degree campus: UBCV
creator: Can, Oguzhan
issued: 2024-02-22T17:46:26Z
issued: 2024
related degree: Doctor of Philosophy - PhD
degree grantor: University of British Columbia
description: In this thesis we explore the physics of moiré heterostructures of few-layer d-wave superconductor thin films. We show that such a twisted bilayer stack exhibits spontaneous time reversal symmetry breaking near 𝜃 = 45º twist, leading to a chiral superconductor state with topological edge modes. We then discuss the signatures of this prediction in polar Kerr effect experiments and find that expected Kerr rotation is three orders of magnitude larger compared to strontium ruthenate, one of the most studied chiral topological superconductor candidates. Another experimental signature of this novel phase we predict turns out to be the superconducting diode effect, which has recently been observed in twisted cuprate bilayers. Inspired by this experimental observation and the Josephson current-phase behaviour of this system, we introduce a novel superconducting circuit element made out of arrays of conventional Josephson junctions which can be printed on a Al or Nb superconducting chip relying on available fabrication technology for practical applications. Finally, we propose a novel superconducting qubit design and discuss its advantages over existing superconducting qubits.
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/87470
note: Topological superconductivity intwisted cupratesand device applications inspired by their JosephsonphysicsbyOguzhan CanB.Sc., The University of Toronto, 2016M.Sc., The University of British Columbia, 2018A 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 2024c© Oguzhan Can, 2024The 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 cuprates and device applicationsinspired by their Josephson physicssubmitted by Oguzhan Can in partial fulfillment of the requirements for the degree ofDoctor of Philosophy in Physics.Examining Committee:Marcel Franz, Professor, Physics and Astronomy, UBCSupervisorAndrea Damascelli, Professor, Physics and Astronomy, UBCSupervisory Committee MemberJoshua Folk, Professor, Physics and Astronomy, UBCUniversity ExaminerLukas Chrostowski, Professor, Electrical and Computer Engineering, UBCUniversity ExaminerJesko Sirker, Professor, Physics and Astronomy, University of ManitobaExternal ExaminerAdditional Supervisory Committee Members:Mona Berciu, Professor, Physics and Astronomy, UBCSupervisory Committee MemberJeremy Heyl, Professor, Physics and Astronomy, UBCSupervisory Committee MemberiiAbstractIn this thesis we explore the physics of moire´ heterostructures of few-layerd-wave superconductor thin films. We show that such a twisted bilayer stackexhibits spontaneous time reversal symmetry breaking near θ = 45o twist,leading to a chiral superconductor state with topological edge modes. Wethen discuss the signatures of this prediction in polar Kerr effect experimentsand find that expected Kerr rotation is three orders of magnitude largercompared to strontium ruthenate, one of the most studied chiral topologicalsuperconductor candidates. Another experi…
has type: Thesis/Dissertation
date issued: 2024-05
is shown at: 10.14288/1.0440126
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/2429/87470