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PERIMETER INSTITUTE RECORDED SEMINAR ARCHIVE

PIRSA:17050081  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Z_2 topological order near the Neel state of the square lattice antiferromagnet
Speaker(s): Subir Sachdev
Abstract:

We classify quantum states proximate to the semiclassical Neel state of the spin S=1/2 square lattice antiferromagnet with two-spin near-neighbor and four-spin ring exchange interactions. Motivated by a number of recent experiments on the cuprates and the iridates, we examine states with Z_2 topological order, an order which is not present in the semiclassical limit. Some of the states break one or more of reflection, time-reversal, and lattice rotation symmetries, and can account for the observations. We discuss implications for the pseudogap phase.

Date: 18/05/2017 - 10:00 am
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