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Emergent quasiparticles at Luttinger surfaces
1International School for Advanced Studies (SISSA), Via Bonomea 265, 34136, Trieste, Italy. fabrizio@sissa.it.
Nature Communications
|March 24, 2022
Summary
Dispersive quasiparticles with infinite lifetimes exist near Luttinger surfaces, contrary to prior beliefs. These quasiparticles exhibit conventional thermodynamic and dynamic properties, including quantum oscillations and linear specific heat.
Area of Science:
- Condensed Matter Physics
- Quantum Mechanics
Background:
- Fermi and Luttinger surfaces are defined by poles and zeros of the Green's function in periodic electron systems.
- Well-defined quasiparticles are typically associated with Fermi surfaces, not Luttinger surfaces where the density of states vanishes.
Purpose of the Study:
- To investigate the existence and properties of quasiparticles near Luttinger surfaces.
- To challenge the conventional understanding of quasiparticle behavior in relation to Luttinger surfaces.
Main Methods:
- Analysis of the single-particle Green's function.
- Theoretical investigation of electronic systems with pseudo-gapped Luttinger surfaces.
Main Results:
- Dispersive quasiparticles with infinite lifetimes were found to exist near pseudo-gapped Luttinger surfaces.
- These quasiparticles demonstrate conventional thermodynamic and dynamic behaviors.
- Observed quantum oscillations and linear-in-temperature specific heat, despite vanishing electron density of states.
Conclusions:
- The existence of quasiparticles near Luttinger surfaces is demonstrated, revising established theories.
- Quasiparticle properties near Luttinger surfaces are analogous to those near Fermi surfaces.
- Findings are particularly relevant for understanding strongly correlated materials.
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