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BEGIN:VEVENT
DTSTAMP:20260826T161242Z
LAST-MODIFIED:20200211T153103Z
DTSTART:20200228T170000Z
DTEND:20200228T183000Z
UID:event2294@bu.edu
URL:http://physics.bu.edu/internal/events/show/2294
SUMMARY:Quantum Thermal Hall Effect of Chiral Spinons in a Kagome Strip 
DESCRIPTION:Featuring Efrat Shimshoni\, Bar-Ilan University\nHosted by: Anu
	shya Chandran\n\nPart of the Biophysics/Condensed Matter Seminar Series.\n\
	nI will describe a recent study of a toy model for the thermal Hall effect 
	in a chiral spin liquid. Specifically\, we focus on a spin-1/2 system on a 
	strip of Kagome lattice modeled as a three-leg XXZ spin-ladder\, where we f
	urther introduce a Dzyaloshinskii-Moriya interaction (D) and a tunable magn
	etic field (B). Using Bosonization to derive a low-energy theory for the sp
	inons in this system\, we identify three distinct B-dependent quantum phase
	s: a valence-bond crystal (VBC)\, a "metallic" spin liquid (MSL) and a chir
	al spin liquid (CSL). In the presence of a temperature difference between t
	he top and the bottom edges of the strip\, we evaluate the net heat current
	 generated along the strip\, and consequently the thermal Hall conductivity
	. We find that the VBC-MSL-CSL transitions are accompanied by a pronounced 
	change in the behavior of thermal Hall coefficient as a function of B. In p
	articular\, analogously to the quantum Hall effect\, in the CSL phase the t
	hermal Hall conductivity exhibits a quantized plateau centered around a com
	mensurate value of the spinon 'filling factor' B/D.
LOCATION:SCI 352\, 590 Commonwealth Avenue\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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