TL;DR
Coulomb drag is a phenomenon where Coulomb interactions between charge carriers in two nearby conductors induce a measurable voltage or current, providing insights into the electronic properties of various condensed matter systems.
Contribution
This paper reviews the Coulomb drag effect, highlighting its significance as a tool for probing many-body interactions in diverse condensed matter systems.
Findings
Coulomb drag reveals information about electron-electron interactions.
It serves as a diagnostic tool in semiconductor and 2D material research.
The effect varies with microscopic properties of the conductors.
Abstract
Coulomb drag is a transport phenomenon whereby long-range Coulomb interaction between charge carriers in two closely spaced but electrically isolated conductors induces a voltage (or, in a closed circuit, a current) in one of the conductors when an electrical current is passed through the other. The magnitude of the effect depends on the exact nature of the charge carriers and microscopic, many-body structure of the electronic systems in the two conductors. Drag measurements have become part of the standard toolbox in condensed matter physics that can be used to study fundamental properties of diverse physical systems including semiconductor heterostructures, graphene, quantum wires, quantum dots, and optical cavities.
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