Speaker
Description
We present numerical evidence for the existence of a quantum liquid state in one spatial dimension, which combines traits from both the standard Luttinger liquid and Fermi liquid phenomenologies. The state is stabilized in a quantum lattice of interacting spinless fermions by selectively turning off marginal interactions, while remaining irrelevant interactions define the unique features of the state. This new 'quasi-Fermi liquid' displays a discontinuity in its momentum distribution at the Fermi momentum. Notably, the excitation spectrum presents well-defined fermionic quasiparticles for the addition spectrum, whereas the removal spectrum shows absence of hole-like quasiparticles giving rise instead to edge singularities. We observed these features in an extended region of parameter space and well beyond the perturbative regime.
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