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BEGIN:VEVENT
DTSTAMP:20261020T034816Z
LAST-MODIFIED:20151002T151239Z
DTSTART:20151007T160000Z
DTEND:20151007T170000Z
UID:event1501@bu.edu
URL:http://physics.bu.edu/internal/events/show/1501
SUMMARY:Observation of Bose-Einstein Condensation in the Harper-Hofstadter 
	Hamiltonian
DESCRIPTION:Featuring Colin Kennedy\, MIT\n\nPart of the Condensed Matter T
	heory Seminar Series.\n\nExtensions of Berry’s phase and the quantum Hall
	 effect have led to the discovery of new states of matter with topological 
	properties. Traditionally\, this has been achieved using magnetic fields or
	 spin–orbit interactions\, which couple only to charged particles. For ne
	utral ultracold atoms\, synthetic magnetic fields have been created that ar
	e strong enough to realize the Harper–Hofstadter model. In this talk\, I 
	report on work creating and studying Bose–Einstein condensation in the Ha
	rper–Hofstadter Hamiltonian with one-half flux quantum per lattice unit c
	ell. The diffraction pattern of the superfluid state directly shows the mom
	entum distribution of the wavefunction\, which is gauge-dependent\, and it 
	reveals both the reduced symmetry of the vector potential and the twofold d
	egeneracy of the ground state. I present an adiabatic many-body state prepa
	ration protocol via the Mott insulating phase and show the superfluid groun
	d state in a three-dimensional lattice with strong interactions. Future pro
	spects for exploring exotic states close to the Mott transition are discuss
	ed in addition to the prospects of creating cold-atom topological insulator
	s by introducing the spin degree of freedom.
LOCATION:SCI 328\, 590 Commonwealth Avenue\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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