Condensed Matter Physics Seminar

Speaker: Alex Levchenko, University of Wisconsin - Madison

Title: Multi-Terminal Josephsonics – Topological Phases and Qubits

Refreshments available at 3:45 pm.

Date: Mon, 11 Dec 2017, 4:10 pm – 5:10 pm

Type: Seminar

Location: 1400 BPS Bldg.

Abstract:
In this talk, we will discuss the emergent band topologies of the subgap Andreev states in the multi-terminal Josephson junctions. In particular, we will look at an analog of the quantum spin Hall state in a three-terminal Josephson device as can be revealed by a quantized conductance, and a Weyl/Dirac semi-metallic phases in a four-terminal device. The classification of the band topologies will be presented based on the symmetry analysis of the Wigner-Dyson classes of random scattering matrices. We will discuss how these devices can realize novel qubit systems, higher classes of Chern topologies, and novel many-body models such as SYK Hamiltonian of interacting Majoranas on a superconducting chip.