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Superconductor-Insulator Transition in a Non-Fermi Liquid.
A L Chudnovskiy1, Alex Kamenev2,3
11. Institut für Theoretische Physik, Universität Hamburg, Notkestraße 9, D-22607 Hamburg, Germany.
Physical Review Letters
|January 6, 2023
Summary
This study introduces a strongly correlated system model exhibiting a quantum phase transition from an insulator to a superconductor. The research reveals a novel Bose metal phase preceding a non-Fermi liquid state.
Area of Science:
- Condensed Matter Physics
- Quantum Materials Science
Background:
- Strongly correlated systems often display complex phases, including non-Fermi liquid behavior.
- Quantum phase transitions (QPTs) are critical phenomena occurring at absolute zero temperature, driven by quantum fluctuations.
Purpose of the Study:
- To model a strongly correlated system with a non-Fermi liquid high-temperature phase.
- To investigate the insulator-superconductor quantum phase transition (QPT) and its associated phases.
Main Methods:
- Development of a theoretical model for a strongly correlated system.
- Analysis of the system's ground state and phase transitions as a function of pairing interaction strength.
Main Results:
- The model exhibits an insulator-to-superconductor QPT originating from a single interaction mechanism.
- The insulating phase shows activation behavior, with energy decreasing to zero at the QPT, creating a quantum critical regime.
- A finite-temperature transition to a Bose metal phase is observed in the superconducting state, preceding the non-Fermi liquid metal.
Conclusions:
- The presented model provides a unified framework for understanding the emergence of insulating, superconducting, Bose metal, and non-Fermi liquid phases.
- The study highlights the rich phase diagram accessible through tuning interaction parameters in strongly correlated systems.
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