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BEGIN:VEVENT
DTSTAMP:20260824T135121Z
LAST-MODIFIED:20130114T151948Z
DTSTART:20130130T190000Z
DTEND:20130130T200000Z
UID:event1059@bu.edu
URL:http://physics.bu.edu/internal/events/show/1059
SUMMARY:Description of phase fluctuations in atomic quasicondensates via th
	e Ornstein-Uhlenbeck stochastic process
DESCRIPTION:Featuring Dr. Igor Mazets\, Vienna Center for Quantum Science a
	nd Technology\, Atominstitut\, TU Wien and Ioffe Physico-Technical Institut
	e of the Russian Academy of Sciences\nHosted by: Anatoli Polkovnikov\n\nPar
	t of the Condensed Matter Theory Seminar Series.\n\nAbstract:\nMeasurement 
	of fluctuations and their correlations yields important information on regi
	mes and phases of many-body quantum systems. A key question in the physics 
	of many-body quantum systems at finite temperature is how many of the obser
	ved fluctuations and their correlations are fundamentally quantum and which
	 are caused by the thermal excitations in the system. We develop a simple s
	emiclassical model based on the spatial evolution of the relative phase acc
	ording to an Ornstein-Uhlenbeck stochastic process with Gaussian phase fluc
	tuations. This model enables us to describe fluctuations in one- and two-di
	mensional quasicondensates and relate the correlations observed in a time-o
	f-flight experiment to the in-trap fluctuations. We find that\, at typical 
	experimental parameters\, the observed fluctuations are essentially classic
	al (thermal) and measuring the quantum noise poses challenging requirements
	 to the precision and resolution of the measurement. Application of the met
	hod to the interpretation of the experimental data will be presented. \n\n[
	1] H.-P. Stimming\, N. J. Mauser\, J. Schmiedmayer\, and I. E. Mazets\, Phy
	s. Rev. Lett. 105\,  015301 (2010).\n[2] T. Betz\, S. Manz\, R. Bücker\, T
	. Berrada\, Ch. Koller\, G. Kazakov\, I. E. Mazets\, H.-P. Stimming\, A. Pe
	rrin\, T. Schumm\, and J. Schmiedmayer\, Phys. Rev. Lett. 106\, 020407 (201
	1). \n[3] I. E. Mazets\, Phys. Rev. A 86\, 055603 (2012).
LOCATION:SCI 328\, 590 Commonwealth Avenue\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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