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PIRSA:17060040

Quantum spin ice under a [111] magnetic field: from pyrochlore to kagome

APA

Onoda, S. (2017). Quantum spin ice under a [111] magnetic field: from pyrochlore to kagome. Perimeter Institute. https://pirsa.org/17060040

Talk numberPIRSA:17060040
Talk Type Conference

Abstract

Quantum spin ice, modeled for magnetic rare-earth pyrochlores, has attracted great interest for hosting a U(1) quantum spin liquid, which involves spin-ice monopoles as gapped deconfined spinons, as well as gapless excitations analogous to photons. However, the global phase diagram under a [111] magnetic field remains open. Here we uncover by means of unbiased quantum Monte-Carlo simulations that a supersolid of monopoles, showing both a superfluidity and a partial ionization, intervenes the kagome spin ice and a fully polarized ionic monopole insulator, in contrast to classical spin ice where a direct discontinuous phase transition takes place. We also show that on cooling, kagome spin ice evolves towards a valence bond solid. Possible relevance to experiments is discussed.