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Spectral properties of one-dimensional Fermi systems after an interaction quench
D M Kennes1, C Klöckner1, V Meden1
1Institut für Theorie der Statistischen Physik, RWTH Aachen University and JARA-Fundamentals of Future Information Technology, 52056 Aachen, Germany.
Physical Review Letters
|September 27, 2014
Summary
Researchers found that spectral properties of one-dimensional Fermi systems reveal unusual nonequilibrium states after interaction quenches. These distinct signatures could be experimentally identified using advanced radio-frequency spectroscopy in cold Fermi gases.
Area of Science:
- Condensed Matter Physics
- Quantum Gases
- Many-Body Physics
Background:
- Luttinger liquid theory describes one-dimensional Fermi systems.
- Understanding nonequilibrium states in quantum systems is crucial.
- Abrupt quenches can drive systems into novel, non-equilibrium phases.
Purpose of the Study:
- To investigate the single-particle spectral properties of gapless 1D Fermi systems.
- To identify unique signatures of a nonequilibrium Luttinger liquid state.
- To explore the potential for experimental detection of this state.
Main Methods:
- Theoretical analysis of single-particle spectral functions.
- Comparison of spectral properties in equilibrium (ground state, finite temperature) and nonequilibrium states.
- Proposal for utilizing enhanced radio-frequency spectroscopy.
Main Results:
- Spectral properties, including line shapes of momentum-integrated and -resolved functions, differ significantly from equilibrium.
- These differences are indicative of the unusual nonequilibrium nature of the intermediate-time state.
- Distinct spectral signatures are predicted for the nonequilibrium Luttinger liquid state.
Conclusions:
- The single-particle spectral properties serve as a clear indicator of the nonequilibrium state.
- Experimental identification of this state is feasible using improved radio-frequency spectroscopy.
- This work opens avenues for studying dynamics and emergent phenomena in quantum many-body systems.
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