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IQIM Postdoctoral and Graduate Student Seminar

Friday, June 19, 2020
11:00am to 12:00pm
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Time-reversal-invariant topological superconductors and the fractional Josephson effect
Christina Knapp, DuBridge Postdoctoral Scholar in Theoretical Physics,

Abstract: Time-reversal-invariant topological superconductor (TRITOPS) wires host Majorana-zero-mode Kramers pairs that have been predicted to mediate a fractional Josephson effect. We explore the fate of the TRITOPS fractional Josephson effect in the presence of local time-dependent perturbations that instantaneously preserve time-reversal symmetry. This talk will review why Majorana zero modes have attracted intense interest in both the condensed matter and quantum computing communities. We will then focus on the Majorana-zero-mode Kramers pairs appearing in TRITOPS wires. We consider a Josephson junction between two TRITOPS wires and demonstrate that the existence of a symmetry-protected ground state degeneracy does not result in a robust adiabatic cycle.

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For more information, please contact Marcia Brown by phone at 626-395-4013 or by email at [email protected].