163 citations · 3.3k across the 109 of their papers we have counts for
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Thermal critical dynamics from equilibrium quantum fluctuations
Irénée Frérot, Adam Rançon, Tommaso Roscilde
We show that quantum fluctuations display a singularity at thermal critical points, involving the dynamical exponent. Quantum fluctuations, captured by the quantum variance (I.…
Quantum mean-field approximation for lattice quantum models: truncating quantum correlations, and retaining classical ones
Daniele Malpetti, Tommaso Roscilde
In a recent work [D. Malpetti and T. Roscilde, arXiv:1605.04223] we have shown that in quantum many-body systems at finite temperature, two-point correlations can be formally separ…
Critical Casimir forces from the equation of state of quantum critical systems
Adam Rancon, Louis-Paul Henry, Félix Rose +4
The mapping between a classical length and inverse temperature as imaginary time provides a direct equivalence between the Casimir force of a classical system in dimensions and…
Quantum correlations, separability and quantum coherence length in equilibrium many-body systems
Daniele Malpetti, Tommaso Roscilde
Non-locality is a fundamental trait of quantum many-body systems, both at the level of pure states, as well as at the level of mixed states. Due to non-locality, mixed states of an…
Quantum variance: a measure of quantum coherence and quantum correlations for many-body systems
Irénée Frérot, Tommaso Roscilde
Quantum coherence is a fundamental common trait of quantum phenomena, from the interference of matter waves to quantum degeneracy of identical particles. Despite its importance, es…
Quantum phase transition in spin systems studied through entanglement estimators
Andrea Fubini, Stephan Haas, Tommaso Roscilde +2
Entanglement represents a pure quantum effect involving two or more particles. Spin systems are good candidates for studying this effect and its relation with other collective phen…
Reading entanglement in terms of spin configurations in quantum magnets
Andrea Fubini, Tommaso Roscilde, Valerio Tognetti +2
We consider a quantum many-body system made of interacting spins on a lattice, and develop a formalism which allows to extract, out of conventional magnetic observabl…
Detection of XY behaviour in weakly anisotropic quantum antiferromagnets on the square lattice
Alessandro Cuccoli, Tommaso Roscilde, Ruggero Vaia +1
We consider the Heisenberg antiferromagnet on the square lattice with S=1/2 and very weak easy-plane exchange anisotropy; by means of the quantum Monte Carlo method, based on the c…
Phase transitions in two-dimensional anisotropic quantum magnets
A. Cuccoli, T. Roscilde, V. Tognetti +2
We consider quantum Heisenberg ferro- and antiferromagnets on the square lattice with exchange anisotropy of easy-plane or easy-axis type. The thermodynamics and the critical behav…
Finite-temperature ordering in two-dimensional magnets
Alessandro Cuccoli, Valerio Tognetti, Tommaso Roscilde +2
We study the two dimensional quantum Heisenberg antiferromagnet on the square lattice with easy-axis exchange anisotropy. By the semiclassical method called pure-quantum self-consi…