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- Dyon condensation in topological Mott insulators

We consider quantum phase transitions out of topological

Mott insulators in which the ground state of the fractionalized excitations

(fermionic spinons) is topologically non-trivial. The spinons in topological

Mott insulators are coupled to an emergent compact U(1) gauge field with a

so-called "axion" term. We study the confinement transitions from the

topological Mott insulator to broken symmetry phases, which may occur via the

condensation of dyons. Dyons carry both "electric" and

"magnetic" charges, and arise naturally in this system because the

monopoles of the emergent U(1) gauge theory acquires gauge charge due to the

axion term. It is shown that the dyon condensate, in general, induces

simultaneous current and bond orders. When the magnetic transition is driven by

dyon condensation, we identify the bond order as valence bond solid order and

the current order as scalar spin chirality order. Hence, the confined phase of

the topological Mott insulator is an exotic phase where the scalar spin chirality

and the valence bond order coexist and appear via a single transition.

If time allows, I will also discuss our recent work on

the proximate symmetry-broken phases of Z2 spin liquid on Kagome lattice.

Collection/Series:

Event Type:

Seminar

Scientific Area(s):

Speaker(s):

Event Date:

Wednesday, November 28, 2012 - 15:30 to 17:00

Location:

Bob Room

©2012 Perimeter Institute for Theoretical Physics