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DTSTAMP:20261017T181343Z
LAST-MODIFIED:20200608T200211Z
DTSTART:20200612T200000Z
DTEND:20200612T210000Z
UID:event2339@bu.edu
URL:http://physics.bu.edu/internal/events/show/2339
SUMMARY:Persistent Dark States & Non-Ergodic Chaos in Anisotropic Central S
	pin Models
DESCRIPTION:Featuring Tamiro Villazon Scholer\, Boston University\, Physics
	 Department\n\nPart of the Departmental Seminars.\n\nDark states\, in which
	 a qubit is effectively decoupled from its environment\, are pervasive in s
	olid-state systems such as quantum dots and defect centers in diamond. In t
	his seminar\, I will present recent work which establishes that dark states
	 are ubiquitous in a large class of inhomogeneous anisotropic central spin 
	models. These models have integrable limits with exact dark eigenstates in 
	which the central qubit is fully polarized. Remarkably\, dark states persis
	t as eigenstates in the presence of strong integrability-breaking perturbat
	ions\, and the qubit retains memory of its initial polarization. Although t
	he eigenstates of the system are chaotic\, exhibiting exponential sensitivi
	ty to small perturbations\, they do not satisfy the eigenstate thermalizati
	on hypothesis. This chaotic but non-ergodic regime is found to be stable at
	 numerically accessible system sizes\, predicting long relaxation times tha
	t increase exponentially with system size. I shall further discuss the impl
	ications of these results in mesoscopic applications to dynamic nuclear pol
	arization and quantum memory.\n\n\n\n------\n\n\nTopic: Departmental Semina
	r - Tamiro Villazon \nTime: Jun 12\, 2020 03:45 PM Eastern Time (US and Can
	ada)\n\nJoin Zoom Meeting\nhttps://bostonu.zoom.us/j/92960484899?pwd=UXBJSX
	IzTUxubDBKL1hKTFY4RGczdz09\n\nMeeting ID: 929 6048 4899\n\nPassword: 455929
	\n\nOne tap mobile\n\n+13126266799\,\,92960484899# US (Chicago)\n+164687699
	23\,\,92960484899# US (New York)
LOCATION: \, \, 
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