163 citations · 3.3k across the 109 of their papers we have counts for
42 papers · 1 filter
Giant number-parity effect and scalable spin squeezing in Luttinger liquids
Filippo Caleca, Saverio Bocini, Fabio Mezzacapo +1
Finite-size quantum spin systems can be magnetized by the application of a symmetry-breaking field, but in general their symmetry is expected to be restored once the field is turne…
Giant number-parity effect leading to spontaneous symmetry breaking in finite-size quantum spin models
Filippo Caleca, Saverio Bocini, Fabio Mezzacapo +1
Spontaneous symmetry breaking (SSB) occurs when a many-body system governed by a symmetric Hamiltonian, and prepared in a symmetry-broken state by the application of a field coupli…
Non-local quench spectroscopy of fermionic excitations in 1D quantum spin chains
Saverio Bocini, Filippo Caleca, Fabio Mezzacapo +1
The elementary excitations of quantum spin systems have generally the nature of weakly interacting bosonic quasi-particles, generated by local operators acting on the ground state.…
Reconstructing the spatial structure of quantum correlations in materials
Allen Scheie, Pontus Laurell, Elbio Dagotto +2
Quantum correlations are a fundamental property of quantum many-body states. Yet they remain experimentally elusive, hindering certification of genuine quantum behavior, especially…
Rotor/spin-wave theory for quantum spin models with U(1) symmetry
Tommaso Roscilde, Tommaso Comparin, Fabio Mezzacapo
The static and dynamics properties of finite-size lattice quantum spin models which spontaneously break a continuous symmetry in the thermodynamic limit are of central impor…
Robust spin squeezing from the tower of states of -symmetric spin Hamiltonians
Tommaso Comparin, Fabio Mezzacapo, Tommaso Roscilde
Spin squeezing - a central resource for quantum metrology - can be generated via the non-linear, entangling evolution of an initially factorized spin state. Here we show that robus…
Long-Range Entangled-Plaquette States for Critical and Frustrated Quantum Systems on a Lattice
Jérôme Thibaut, Tommaso Roscilde, Fabio Mezzacapo
We explore a variational Ansatz for lattice quantum systems -- named long-range entangled-plaquette state -- in which pairs of clusters of adjacent lattice sites are correlated at…
Quench dynamics of quantum spin models with flat bands of excitations
Raphaël Menu, Tommaso Roscilde
We investigate the unitary evolution following a quantum quench in quantum spin models possessing a (nearly) flat band in the linear excitation spectrum. Inspired by the perspectiv…
Reconstructing the quantum critical fan of strongly correlated systems via quantum correlations
Irénée Frérot, Tommaso Roscilde
Albeit occurring at zero temperature, quantum critical phenomena are known to have a huge impact on the finite-temperature phase diagram of strongly correlated systems -- an aspect…
Entanglement and fluctuations in the XXZ model with power-law interactions
Irénée Frérot, Piero Naldesi, Tommaso Roscilde
We investigate the ground-state properties of the XXZ model with interactions, describing spins interacting with long-range (LR) transverse (XX) ferromagnetic interactions…
Auxiliary-Field Monte Carlo for lattice bosons: tackling strong interactions and frustration
Daniele Malpetti, Tommaso Roscilde
We introduce a new numerical technique -- bosonic auxiliary-field Monte Carlo (bAFMC) -- which allows to calculate the thermal properties of large lattice-boson systems within a sy…
Entanglement entropy across the superfluid-insulator transition : a signature of bosonic criticality
Irénée Frérot, Tommaso Roscilde
We study the entanglement entropy and entanglement spectrum of the paradigmatic Bose-Hubbard model, describing strongly correlated bosons on a lattice. The use of a controlled appr…
Order-by-disorder and quantum Coulomb phase in quantum square ice
Louis-Paul Henry, Tommaso Roscilde
We reconstruct the equilibrium phase diagram of quantum square ice, realized by the transverse-field Ising model on the checkerboard lattice, using a combination of quantum Monte C…
Dirty-boson physics with magnetic insulators
Andrey Zheludev, Tommaso Roscilde
We review recent theoretical and experimental efforts aimed at the investigation of the physics of interacting disordered bosons (so-called dirty bosons) in the context of quantum…
Quantum critical scaling at a Bose-glass/superfluid transition: theory and experiment on a model quantum magnet
Rong Yu, Corneliu F. Miclea, Franziska Weickert +4
In this paper we investigate the quantum phase transition from magnetic Bose glass to magnetic Bose-Einstein condensation induced by a magnetic field in NiCl2.4SC(NH2)2 (dichloro-t…
Realization of the anisotropic XY model in a Tb(III)-W(V) chain compound
Edoardo Pasca, Tommaso Roscilde, Marco Evangelisti +4
We present evidence of 1D S=1/2 anisotropic XY ferromagnetism in the paramagnetic phase of the cyanido-bridged chain complex [Tb(pzam)3(H2O)M(CN)8]H2O, with M=W(V), based upon the…
Quantum Monte Carlo calculation of entanglement Renyi entropies for generic quantum systems
Stephan Humeniuk, Tommaso Roscilde
We present a general scheme for the calculation of the Renyi entropy of a subsystem in quantum many-body models that can be efficiently simulated via quantum Monte Carlo. When the…
Spin-wave analysis of the transverse-field Ising model on the checkerboard lattice
Louis-Paul Henry, Peter C. W. Holdsworth, Frédéric Mila +1
The ground state properties of the S=1/2 transverse-field Ising model on the checkerboard lattice are studied using linear spin wave theory. We consider the general case of differe…
Bose glass and Mott glass of quasiparticles in a doped quantum magnet
Rong Yu, Liang Yin, Neil S. Sullivan +12
The low-temperature states of bosonic fluids exhibit fundamental quantum effects at the macroscopic scale: the best-known examples are Bose-Einstein condensation (BEC) and superflu…
Pairing, crystallization and string correlations of mass-imbalanced atomic mixtures in one-dimensional optical lattices
Tommaso Roscilde, Cristian Degli Esposti Boschi, Marcello Dalmonte
We numerically determine the very rich phase diagram of mass-imbalanced binary mixtures of hardcore bosons (or equivalently -- fermions, or hardcore-Bose/Fermi mixtures) loaded in…
Correlations in Quantum Spin Ladders with Site and Bond Dilution
Kien Trinh, Stephan Haas, Rong Yu +1
We investigate the effects of quenched disorder, in the form of site and bond dilution, on the physics of the antiferromagnetic Heisenberg model on even-leg ladders. Site d…
Modified spin-wave theory with ordering vector optimization II: Spatially anisotropic triangular lattice and model with Heisenberg interactions
Philipp Hauke, Tommaso Roscilde, Valentin Murg +2
We study the ground state phases of the Heisenberg quantum antiferromagnet on the spatially anisotropic triangular lattice and on the square lattice with up to next-next-ne…
Magnetic Bose glass phases of coupled antiferromagnetic dimers with site dilution
Rong Yu, Omid Nohadani, Stephan Haas +1
We numerically investigate the phase diagram of two-dimensional site-diluted coupled dimer systems in an external magnetic field. We show that this phase diagram is characterized b…
Universal phase diagram of disordered bosons from a doped quantum magnet
Rong Yu, Stephan Haas, Tommaso Roscilde
A quantum particle cannot in general diffuse through a disordered medium because of its wavelike nature, but interacting particles can escape localization by collectively percolati…