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- Z2 spin liquid in kagome Heisenberg antiferromagnet

A quantum spin liquid is a hypothesized ground state of a

magnet without long-range magnetic order. Similar to a liquid, which is

spatially uniform and strongly correlated, a quantum spin liquid preserves all

the symmetries and exhibits strong correlations between spins. First proposed

by P. W. Anderson in 1973, it has remained a conjecture until recently. In the

past couple of years, numerical studies have provided strong evidences for

quantum spin liquid in a simple model, the kagome Heisenberg antiferromagnet. In this talk, I will describe a low-energy effective theory

for this magnet in terms of a lattice gauge theory with the simplest possible

mathematical structure (a group of two elements, namely Z2). I will show that

the theory reproduces many characteristic features observed numerically,

thereby providing a bridge between the numeircs and the analytics. Furthermore,

I will present theoretical predictions which could be tested in future

numerical studies.

Collection/Series:

Event Type:

Seminar

Scientific Area(s):

Speaker(s):

Event Date:

Tuesday, November 5, 2013 - 15:30 to 17:00

Location:

Bob Room

Room #:

405

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