Condensed Matter Seminar

semester, 2018


Wednesday, January 31st 2018
1:30 pm:
Speaker: Sergey Frolov (Pittsburgh)
Subject: Quantum dot chains as emulators of topological superconductors

Tunneling spectroscopy measurements on one-dimensional superconducting hybrid materials have revealed signatures of Majorana fermions which are the edge states of a bulk topological superconducting phase. We couple strong spin-orbit semiconductor InSb nanowires to conventional superconductors (NbTiN, Al) to obtain additional signatures of Majorana fermions and to explore the magnetic-field driven topological phase transition. Specifically, we map out the phase diagram of the topological phase in the space of Zeeman energy and chemical potential, and investigate the apparent closing and re-opening of the superconducting gap. We investigate how the topological superconducting phase would manifest in finite size systems, by electrostatically splitting the wire into segments of varied length. By chaining up several segments of a nanowire, we are realizing a quantum simulator of the Kitaev chain with tunable on-site energies and couplings between the sites, a step towards quantum simulation with semiconductor nanostructures.

Faculty Host: Vlad Pribiag

Wednesday, February 7th 2018
1:30 pm:
Speaker: Cristian Batista (Tennessee)
Faculty Host: Natalia Perkins

Wednesday, February 21st 2018
1:25 pm:
Speaker: Erez Berg (U of Chicago)
Faculty Host: Rafael Fernandes

Wednesday, February 28th 2018
Speaker: Antoine Georges (College de France & Simons Foundation)
Subject: To be announced.
Faculty Host: Martin Greven

Wednesday, March 21st 2018
1:25 pm:
Speaker: Pablo Jarillo-Herrero, MIT
Subject: TBD
Faculty Host: Vlad Pribiag

Wednesday, March 28th 2018
1:30 pm:
Speaker: Paul Canfield (Iowa State)
Subject: TBD
Faculty Host: Martin Greven

Wednesday, April 18th 2018
1:30 pm:
Speaker: Ali Yazdani (Tentative)
Faculty Host: Paul Crowell

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