BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//RLASKEY//CALENDEROUS//EN
CALSCALE:GREGORIAN
METHOD:PUBLISH
BEGIN:VEVENT
DTSTAMP:20260815T222928Z
LAST-MODIFIED:20171006T140420Z
DTSTART:20171006T160000Z
DTEND:20171006T173000Z
UID:event1820@bu.edu
URL:http://physics.bu.edu/internal/events/show/1820
SUMMARY:"Diabatic approach to creating ground states of certain critical mo
	dels"
DESCRIPTION:Featuring Kartiek Agrawal\, Princeton University\nHosted by: An
	atoli Polkovnikov\n\nPart of the Condensed Matter Theory Seminar Series.\n\
	nWe propose a spatio-temporal quench protocol that allows for the fast prep
	aration of ground states of gapless models with Lorentz invariance. Assumin
	g the system initially resides in the ground state of a corresponding massi
	ve model\, we show that a supersonically-moving ‘front’ that locally qu
	enches the mass\, leaves behind it (in space) a state arbitrarily close to 
	the ground state of the gapless model. Importantly\, our protocol takes tim
	e O (L) to produce the ground state of a system of size ∼ Ld (d spatial d
	imensions)\, while a fully adiabatic protocol requires time ∼ O( L2) to p
	roduce a state with exponential accuracy in L. We provide proof-of-concept 
	by solving the proposed quench exactly for a system of free bosons in arbit
	rary dimensions\, and for free fermions in d = 1. We also discuss the role 
	of interactions and UV effects on the free-theory idealization\, before num
	erically illustrating the usefulness of the approach using simulations on c
	lassical phonons and on the quantum Heisenberg spin-chain with a mass induc
	ed by local magnetic fields.
LOCATION:SCI 352\, 590 Commonwealth Avenue\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
END:VEVENT
END:VCALENDAR