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DTSTAMP:20260816T131029Z
LAST-MODIFIED:20150129T183210Z
DTSTART:20150218T160000Z
DTEND:20150218T170000Z
UID:event1375@bu.edu
URL:http://physics.bu.edu/internal/events/show/1375
SUMMARY:Artificial Gauge Fields in Driven Optical Lattices
DESCRIPTION:Featuring Dr. Julian Struck\, MIT\nHosted by: Marin Bukov\n\nPa
	rt of the Condensed Matter Theory Seminar Series.\n\nAbstract:\nQuantum gas
	es provide a controllable and isolated environment for the investigation of
	 model Hamiltonians\, reaching from the weakly-interacting to the strongly-
	correlated regime. However\, as the constituent particles of these gases ar
	e typically neutral they do not respond to electromagnetic fields via the L
	orentz force. This is a central limitation towards the simulation of variou
	s solid state models involving electromagnetic fields.\nIn recent years the
	 creation of synthetic gauge fields for ultracold neutral atoms has develop
	ed to a promising field that allows overcoming this limitation. In particul
	ar\, it has been demonstrated that periodically driven optical lattices can
	 stroboscopically mimic the effects of gauge fields.\nIn this talk\, we rep
	ort on the experimental realization of a spin model with coupled continuous
	 and discrete degrees of freedom on a periodically driven triangular lattic
	e. As a result of an artificial staggered magnetic field\, the bosonic atom
	s in the lattice show persistent circular currents in analogy to the cyclot
	ron motion of electrons in magnetic fields. The direction of this mass flow
	 provides a discrete Ising variable\, while the local phase of the coherent
	 state on each lattice site represents a continuous variable. By measuring 
	the magnetization of the systems we observe a thermally driven Ising-type p
	hase transition from an ordered\, (anti-)ferromagnetic to an unordered\, pa
	ramagnetic state.\nFurther\, we discuss our recent proposal to engineer a t
	ime-periodic and spin-dependent drive in order to realize spin-dependent tu
	nnel matrix elements and spin-orbit coupling in an optical lattice.
LOCATION:SCI 328\, 590 Commonwealth Avenue\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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