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Condensed Matter Seminars

ics Condensed Matter
Thursday, November 5, 2015
11:00 AM
Physics Building, Room 313
Prof. Eun-Ah Kim [Host: Seunghun Lee]
Cornell University
"Topological superconductivity in Metal/Quantum-Spin-Ice heterostructure"

Achieving predictive power is the central problem faced by the field of unconventional superconductivity. One long standing proposal by Anderson predicts that a quantum spin liquid(QSL) will give way to a superconductor upon doping. However, to the best of our knowledge no QSL has been successfully doped into becoming a superconductor. In this talk, I will discuss our proposal of a conceptually new framework. We propose to exploit spin entanglement in QSL to drive superconductivity without doping and hence destroying QSL: a heterostructure consisting of a QSL and a metal. In this new proposal, the conduction electrons in metal will "borrow" the spin correlation in QSL to pair leaving QSL itself intact. To aid materialization of the proposed setup we focus on using quantum spin ice as the QSL layer and establish the guideline for finding a suitable compound to be grown on a QSL substrate. I will present our prediction for a topological superconductivity in one such setup: Y2Sn2-xSbxO7 grown on the (111) surface of Pr2Zr2O7. The predicted order parameter symmetry is analogous to that of 2D superfluid He3-B phase and the realization of the proposal will amount to the first solid-state realization of such pairing state.

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