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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:1
UID:UW-Physics-Event-8872
DTSTART:20241031T150000Z
DTEND:20241031T230000Z
DTSTAMP:20260413T184626Z
LAST-MODIFIED:20241029T002424Z
LOCATION:5310 Chamberlin
SUMMARY:Optical signatures of interlayer electron coherence in a bilay
 er semiconductor\, R. G. Herb Condensed Matter Seminar\, Pavel Dolgire
 v \, Harvard University
DESCRIPTION:Emergent strongly-correlated electronic phenomena in atomi
 cally-thin transition metal dichalcogenides are an exciting frontier i
 n condensed matter physics\, with examples ranging from bilayer superc
 onductivity and electronic Wigner crystals to the ongoing quest for ex
 citon condensation. Here\, we experimentally investigate the propertie
 s of indirect excitons in naturally-grown MoS2-homobilayer\, integrate
 d in a dual-gate device structure allowing independent control of the 
 electron density and out-of-plane electric field. Under conditions whe
 n electron tunneling between the layers is negligible\, upon electron 
 doping the sample\, we observe that the two excitons with opposing dip
 oles hybridize\, displaying unusual behavior distinct from both conven
 tional level crossing and anti-crossing. We show that these observatio
 ns can be explained by static random coupling between the excitons\, w
 hich increases with electron density and decreases with temperature. W
 e argue that this phenomenon is indicative of a spatially fluctuating 
 order parameter in the form of interlayer electron coherence\, a theor
 etically predicted many-body state that has yet to be unambiguously es
 tablished experimentally outside of the quantum Hall regime. Implicati
 ons of our findings for future experiments and quantum optics applicat
 ions are discussed.
URL:https://www.physics.wisc.edu/events/?id=8872
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