3 papers
cond-mat.stat-mech2026
Arctic Curves and a Gapped Gas Phase in a Two-Band Free-Fermion Chain
Charles Jordan, Dimitri M. Gangardt, Alexander G. Abanov
We study the imaginary-time evolution of a domain-wall state constrained to return to itself in a staggered free-fermion chain. The resulting space-time profile separates into froz…
cond-mat.stat-mech2026
Logarithmic singularity in a dynamical quantum phase transition for free fermions
Yasser Bezzaz, Dimitri M. Gangardt, Pavel L. Krapivsky +3
We study the Loschmidt echo in a system of N non-interacting spinless lattice fermions released from a double-domain-wall initial state. In the large-N limit, the return probabilit…
cond-mat.stat-mech2024
Emptiness Instanton in Quantum Polytropic Gas
Alexander G. Abanov, Dimitri M. Gangardt
The emptiness formation problem is addressed for a one-dimensional quantum polytropic gas characterized by an arbitrary polytropic index , which defines the equation of state $P…