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BEGIN:VEVENT
DTSTAMP:20260811T223845Z
LAST-MODIFIED:20121116T203436Z
DTSTART:20120413T160000Z
DTEND:20120413T170000Z
UID:event874@bu.edu
URL:http://physics.bu.edu/internal/events/show/874
SUMMARY:Field induced phases in quantum magnets - theory and experiments
DESCRIPTION:Featuring Cristian Batista\, Los Alamos National Laboratory\nHo
	sted by: Anders Sandvik\n\nPart of the Biophysics/Condensed Matter Seminar 
	Series.\n\n Abstract:\nQuantum magnets that remain invariant under con
	tinuous rotations (along at least one axis) can be described as gases of in
	teracting bosons whose number is conserved. An external field that acts lik
	e a chemical potential controls the particle concentration\, while the sing
	le-ion anisotropy and exchange terms determine the kinetic energy and boson
	-boson interactions. We will see how these simple ingredients lead to unusu
	al phases and magnetic field induced quantum phase transitions. The region 
	near the field induced transition between a quantum paramagnet and a magnet
	ically ordered state can be universally described as a dilute gas of bosons
	. Depending on the sign of the boson-boson interactions and the geometric f
	rustration of the underlying lattice\, the applied field can induce simple 
	Bose-Einstein condensates (BECs)\, BECs of pairs of bosons that are similar
	 to the condensation of diatomic molecules\, complex crystals or even the c
	oexistence of BEC and crystalline states that is also known as supersolid. 
	We will see what is the magnetic interpretation of this spectrum of phases 
	and what are the basic principles for finding them in simple materials. In 
	particular\, I will present a few examples of compounds that exhibit some o
	f these states\, together with comparisons between experiments and theory. 
	Finally\, I will propose a few ideas for finding experimental realizations 
	of the exotic magnetic phases that remain to be discovered.\n \n 
	\n \n 
LOCATION:SCI 352\, 590 Commonwealth Avenue\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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