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Coulomb Drag and Heat Transfer in Strange Metals
A L Chudnovskiy1, Alex Levchenko2, Alex Kamenev3,4
1I. Institut für Theoretische Physik, Universität Hamburg, Notkestraße 9, D-22607 Hamburg, Germany.
Physical Review Letters
|September 18, 2023
Summary
We investigated Coulomb drag and heat transfer in metals, finding strange metals exhibit temperature-independent drag resistivity, unlike Fermi liquids. This discovery offers new insights into quantum critical phenomena.
Area of Science:
- Condensed matter physics
- Quantum many-body systems
Background:
- Coulomb drag and near-field heat transfer are crucial phenomena in layered electronic systems.
- Understanding the transition between Fermi liquid and strange metal phases is a key challenge in condensed matter physics.
Purpose of the Study:
- To investigate Coulomb drag and near-field heat transfer in a double-layer system of incoherent metals.
- To model the crossover from Fermi liquid to strange metal behavior using SYK dots.
- To explore the distinct transport properties in each phase.
Main Methods:
- Modeling each metal layer as an array of tunnel-coupled Sachdev-Ye-Kitaev (SYK) dots.
- Introducing random interlayer interactions to capture realistic material properties.
- Analyzing the system's behavior across varying intradot interactions and interdot tunneling strengths.
Main Results:
- The model successfully captures the crossover from Fermi liquid to strange metal phases.
- Strange metal behavior is characterized by an absence of quasiparticles, leading to temperature-independent drag resistivity.
- Fermi liquid behavior exhibits a quadratic temperature dependence for drag resistivity.
- All relevant parameters can be independently measured via near-field heat transfer experiments.
Conclusions:
- The study provides a theoretical framework for understanding transport in strange metals.
- Near-field heat transfer experiments offer a viable method for probing both Fermi liquid and strange metal regimes.
- The distinct drag resistivity behaviors highlight fundamental differences between these electronic phases.
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