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Quasi-1D Coulomb Drag in the Nonlinear Regime
Mingyang Zheng1, Rebika Makaju1, Rasul Gazizulin1,2
1University of Florida, Department of Physics, Gainesville, Florida 32611, USA.
Physical Review Letters
|June 27, 2025
Summary
This study explores nonlinear Coulomb drag in quantum wires, revealing non-Fermi-liquid behavior. The findings extend understanding of Tomonaga-Luttinger liquids beyond linear response theory.
Area of Science:
- Condensed Matter Physics
- Quantum Transport
Background:
- One-dimensional Coulomb drag is crucial for studying interacting Tomonaga-Luttinger liquids.
- Previous research primarily focused on the linear response regime, leaving nonlinear predictions largely untested.
Purpose of the Study:
- To investigate Coulomb drag in the nonlinear regime between coupled quasi-one-dimensional quantum wires.
- To experimentally validate theoretical predictions for Tomonaga-Luttinger liquids beyond linear response.
Main Methods:
- Measurements of reciprocal momentum transfer induced Coulomb drag.
- Utilized vertically coupled quasi-one-dimensional quantum wires separated by 15 nm.
- Performed experiments at ultralow temperatures.
Main Results:
- Observed a nonlinear drag voltage dependence on drive current with oscillatory contributions.
- Current-voltage characteristics showed nonmonotonic temperature dependence.
- Non-Fermi-liquid behavior was confirmed through these observations.
Conclusions:
- Experimental results align with theoretical predictions for nonlinear Coulomb drag in Tomonaga-Luttinger liquids.
- Non-Fermi-liquid behavior is present in both single and multiple subband regimes, and in the presence of disorder.
- The study extends the understanding of this behavior beyond the clean, single-channel Tomonaga-Luttinger regime.
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