Negative Coulomb Drag in Coupled Quantum Wires
Shunsuke C. Furuya, Hiroyasu Matsuura, Masao Ogata
TL;DR
This paper develops a theoretical model explaining negative Coulomb drag in coupled quantum wires, emphasizing the role of electron density commensurability and long-range Coulomb interactions in inducing particle-hole pairing and resulting in negative drag.
Contribution
It introduces a novel theory linking electron density commensurability and long-range interactions to negative Coulomb drag in quantum wires.
Findings
Negative Coulomb drag can occur due to particle-hole pairing.
Long-range Coulomb interactions enable particle-hole pairing over wires.
The theory explains the positive drag of holes leading to negative drag.
Abstract
We present a theory of negative Coulomb drag in capacitively coupled quantum wires based on the commensurability of the electron density and the long-range nature of the Coulomb interaction in the Tomonaga-Luttinger liquid. The commensurability introduces a notion of doped particles and holes. We point out that the long-range interaction allows a particle-hole pairing over the wires and that the particle-hole pairing brings about the positive drag of holes, that is, the negative drag.
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Taxonomy
TopicsQuantum and electron transport phenomena · Semiconductor Quantum Structures and Devices · Physics of Superconductivity and Magnetism