Click here for a printable version of this page.
Condensed Matter Seminars
Condensed Matter
Monday, November 3, 2008
3:30 PM
Physics Building, Room 204
Note special date.
Note special time.
Note special room.

Kai Sun
[Host: Paul Fendley]
University of Illinois
"Timereversal symmetry breaking and spontaneous anomalous Hall effect in Fermi fluids"
Slideshow (PDF)

ABSTRACT:
We study the spontaneous nonmagnetic timereversal symmetry breaking in a 2D Fermi liquid without breaking either the translational symmetry or the
U(1) charge symmetry. Using a Berry phase approach, we found that for a large class of models, including all one and twoband models, the timereversal symmetry breaking states can be classified into two classes, dubbed type I and II, depending on the accompanying spatial symmetry breaking patterns. The properties of each class are studied. In particular, we show that the states breaking both timereversal and chiral symmetries (type II) are described by spontaneously generated Berry phases and exhibit anomalous Hall effect in the absence of magnetic fields and magnetic impurities. We also show examples of the timereversal symmetry breaking phases in several different microscopically motivated models and calculate their associated Hall conductance within a meanfield approximation. In particularly, we found a simple lattice structure in which the timereversal symmetry breaking phases can be stabilized by infinitesimal interactions.

SLIDESHOW:




To add a speaker, send an email to
physspeakers@Virginia.EDU.
Please include the seminar type (e.g. Condensed Matter Seminars), date, name of the speaker, title of talk, and an abstract (if available).
