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PRODID:UW-Madison-Physics-Events
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SEQUENCE:2
UID:UW-Physics-Event-9546
DTSTART:20260122T160000Z
DTEND:20260123T000000Z
DTSTAMP:20260413T102616Z
LAST-MODIFIED:20260112T215242Z
LOCATION:5310 Chamberlin Hall\, hosted by Tiancheng Song
SUMMARY:Coulomb Drag Studies of Interacting Luttinger Liquids\, R. G. 
 Herb Condensed Matter Seminar\, Mingyang Zheng\, University of Florida
DESCRIPTION:One-dimensional (1D) quantum wires provide a powerful plat
 form for exploring strong electron–electron interactions and collect
 ive excitations under extreme confinement. Coulomb drag between couple
 d 1D systems offers a uniquely sensitive probe of Tomonaga–Luttinger
  liquid (TLL) physics\, yet some of the central drag theoretical predi
 ctions have remained experimentally untested. In the first part of thi
 s talk\, I will introduce the Coulomb drag measurement technique and p
 resent our earlier results on tunable reciprocal and nonreciprocal Cou
 lomb drag in vertically coupled quantum wires\, including drag in the 
 nonlinear regime. These studies establish a flexible platform in which
  Coulomb drag contributions can be tuned by gate voltage and temperatu
 re\, and they provide a robust experimental route to extracting TLL in
 teraction parameters in realistic\, multichannel quantum wires. In the
  second part of the talk\, I will discuss our most recent work on Coul
 omb drag in the presence of a perpendicular magnetic field. Using magn
 etic depopulation\, we characterize the gate-dependent electron densit
 y in individual 1D wires. We find that the magnetic-field dependence o
 f the drag resistance exhibits clear oscillations that align with the 
 depopulation of 1D subbands. Moreover\, the observed downturn in the h
 igh-temperature Arrhenius activation behavior and the corresponding up
 turn in the intermediate-temperature power-law exponent are consistent
  with Coulomb drag between density-mismatched 1D wires. I will conclud
 e with a brief overview of earlier work from my previous group on elec
 trically controlled spin-polarized light-emitting diodes based on a 2D
  CrI₃/hBN/WSe₂ heterostructure\, highlighting connections to spin-
 dependent transport and hybrid low-dimensional systems.
URL:https://www.physics.wisc.edu/events/?id=9546
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