Coulomb Drag Studies of Interacting Luttinger Liquids
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Date: Thursday, January 22nd
Time: 10:00 am - 6:00 pm
Place: 5310 Chamberlin Hall, hosted by Tiancheng Song
Speaker: Mingyang Zheng, University of Florida
Abstract: One-dimensional (1D) quantum wires provide a powerful platform for exploring strong electron–electron interactions and collective excitations under extreme confinement. Coulomb drag between coupled 1D systems offers a uniquely sensitive probe of Tomonaga–Luttinger liquid (TLL) physics, yet some of the central drag theoretical predictions have remained experimentally untested. In the first part of this talk, I will introduce the Coulomb drag measurement technique and present our earlier results on tunable reciprocal and nonreciprocal Coulomb 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 temperature, and they provide a robust experimental route to extracting TLL interaction parameters in realistic, multichannel quantum wires. In the second part of the talk, I will discuss our most recent work on Coulomb drag in the presence of a perpendicular magnetic field. Using magnetic depopulation, we characterize the gate-dependent electron density in individual 1D wires. We find that the magnetic-field dependence of the drag resistance exhibits clear oscillations that align with the depopulation of 1D subbands. Moreover, the observed downturn in the high-temperature Arrhenius activation behavior and the corresponding upturn in the intermediate-temperature power-law exponent are consistent with Coulomb drag between density-mismatched 1D wires. I will conclude with a brief overview of earlier work from my previous group on electrically 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.
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