Article
Physics, Multidisciplinary
Przemyslaw Koscik, Tomasz Sowinski
Summary: We investigate the ground state of polarized fermions interacting through zero-range p-wave forces in one dimension. We prove that in the limit of infinite attraction, the spectral properties of any-order reduced density matrix describing arbitrary subsystems are independent of the shape of an external potential. Furthermore, we show that the purity of these matrices, which quantifies the amount of quantum correlations, can be analytically obtained for any number of particles without diagonalization. This observation serves as a rigorous benchmark for models and methods studying strongly interacting p-wave fermions.
PHYSICAL REVIEW LETTERS
(2023)
Article
Optics
Giovanni Pecci, Patrizia Vignolo, Anna Minguzzi
Summary: The spin-mixing dynamics of a one-dimensional strongly repulsive Fermi gas under harmonic confinement was studied, revealing superdiffusion, spin-dipolar large amplitude oscillations, and thermalization. A universal scaling of the oscillations with particle number N-1/4 was reported.
Article
Multidisciplinary Sciences
Ruotian Gong, Guanghui He, Xingyu Gao, Peng Ju, Zhongyuan Liu, Bingtian Ye, Erik A. Henriksen, Tongcang Li, Chong Zu
Summary: In this study, we investigated the coherent dynamics of strongly interacting ensembles of negatively charged boron vacancy (V-B(-)) centers in hexagonal boron nitride (hBN). By selectively isolating different dephasing sources, we observed significant improvement in the measured coherence times and estimated the concentration of V-B(-). Additionally, we studied the spin response of V-B(-) to local charged defects induced electric field signals.
NATURE COMMUNICATIONS
(2023)
Article
Physics, Multidisciplinary
Camille Lagoin, Stephan Suffit, Kirk Baldwin, Loren Pfeiffer, Francois Dubin
Summary: In this research, the existence of a Mott phase was observed by exploring the Bose-Hubbard model with semiconductor excitons confined in a two-dimensional lattice. This provides a potential pathway for studying many-body phases that break lattice symmetry.
Article
Physics, Multidisciplinary
Milosz Panfil, Sarang Gopalakrishnan, Robert M. Konik
Summary: Many experimentally relevant systems are quasi-one-dimensional, consisting of nearly decoupled chains, where weak interchain couplings play a crucial role in thermalizing the system. We developed a Boltzmann-equation formalism involving a collision integral that is asymptotically exact for any interacting integrable system, and applied it to study relaxation in coupled Bose gases in the Newton's cradle setup. We found that relaxation involves a broad spectrum of timescales and the Markov process governing relaxation at late times is gapless, leading to nonexponential approach to equilibrium even for spatially uniform perturbations.
PHYSICAL REVIEW LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Frederick del Pozo, Loic Herviou, Karyn Le Hur
Summary: We investigate the topological phases of two interacting superconducting wires in one dimension (1D) and propose directly measurable topological markers from ground-state correlation functions. These quantities remain powerful tools in the presence of couplings and interactions. We show that the double critical Ising (DCI) phase of two interacting Kitaev chains is a fractional topological phase with gapless Majorana modes in the bulk and a one-half topological invariant per wire. Using both numerics and quantum field theoretical methods, we demonstrate that the phase diagram remains stable in the presence of an interwire hopping amplitude t perpendicular to at length scales below similar to 1/t perpendicular to. A large interwire hopping amplitude leads to the emergence of two integer topological phases, which are also stable at large interactions. These phases host one edge mode per boundary shared between both wires. At large interactions, the two wires are described by Mott physics, with the t perpendicular to hopping amplitude resulting in a paramagnetic order.
Article
Optics
Sagarika Basak, Han Pu
Summary: The study examines a two-component coupled Bose gas in a 1D optical lattice. The coupling of components leads to changes in spin phases and reveals remarkable spin correlations. The phase transition shifts from first to second order with the introduction of coupling, resulting in the emergence of two spin phases instead of one.
Article
Multidisciplinary Sciences
T. -W. Zhou, G. Cappellini, D. Tusi, L. Franchi, J. Parravicini, C. Repellin, S. Greschner, M. Inguscio, T. Giamarchi, M. Filippone, J. Catani, L. Fallani
Summary: The Hall effect, which describes the motion of charged particles in magnetic fields, has important implications for material properties. Understanding this effect in interacting systems is challenging, even for small magnetic fields. In this study, we used an atomic quantum simulator to investigate the behavior of ultracold fermions in the presence of artificial magnetic fields. Through experimental measurements, we observed a universal behavior of the Hall response, which is independent of the strength of atomic interactions. This research demonstrates the capability of quantum simulation to describe strongly correlated topological states of matter.
Article
Physics, Multidisciplinary
Li Yang, Shah Saad Alam, Han Pu
Summary: This article reviews some work on strongly interacting 1D spinor quantum gas, discussing a generalized Bose-Fermi mapping and constructing an ansatz wavefunction for the strongly interacting system.
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
(2022)
Article
Multidisciplinary Sciences
Hideki Konishi, Kevin Roux, Victor Helson, Jean-Philippe Brantut
Summary: Directly coupling cavity photons to pairs of atoms in a strongly interacting Fermi gas generates pair polaritons-hybrid excitations coherently mixing photons, atom pairs and molecules.
Article
Optics
Gianni Aupetit-Diallo, Silvia Musolino, Mathias Albert, Patrizia Vignolo
Summary: We investigate the equilibrium momentum distribution of strongly interacting one-dimensional mixtures of particles at zero temperature confined in a box potential. We find that the magnitude of the tail of the momentum distribution, characterized by 1/k4, is influenced not only by short-distance correlations but also by the presence of rigid walls. This additional contribution, which includes a k-independent term and an oscillating part, breaks the Tan relation and surprisingly encodes information on long-range spin correlations.
Article
Physics, Multidisciplinary
Ronan Gautier, Hepeng Yao, Laurent Sanchez-Palencia
Summary: The study reveals a superfluid-to-Bose glass transition in two-dimensional correlated bosons under an eightfold quasicrystal potential, and shows that strong interactions stabilize Mott insulator phases with broken eightfold symmetry.
PHYSICAL REVIEW LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Sourav Nandy, Ferdinand Evers, Soumya Bera
Summary: Many-body localization is a theoretical concept describing the interplay of quantum interference and many-body interaction-induced dephasing. The study investigates how dephasing affects observable variance in the disordered spinless Hubbard model, revealing strong temporal fluctuations in local charge density. Results comparing exact computations with the time-dependent Hartree-Fock approximation shed light on the correlations underlying the damping mechanism and its implications for experimentally relevant observables.
Article
Optics
Ren Liao, Fangyu Xiong, Xuzong Chen
Summary: Through numerical studies, it is found that an exact one-dimensional transverse Ising model can be obtained through superexchange interactions in a one-dimensional double-chain tilted lattice. The results indicate that the dynamic quantum phase transition of the transverse Ising model can be accurately simulated using a double-chain Bose-Hubbard model.
Article
Physics, Multidisciplinary
Chris Nill, Kay Brandner, Beatriz Olmos, Federico Carollo, Igor Lesanovsky
Summary: When atoms are excited to high-lying Rydberg states, their interactions with dipolar forces play a significant role. These interactions not only affect the dissipative effects caused by the coupling of Rydberg atoms with the surrounding electromagnetic field, but also modify the frequency of emitted photons, making it dependent on the local neighborhood of the emitting atom. The interactions among Rydberg atoms accelerate decoherence and affect dissipative phase transitions.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Francesco Di Colandrea, Alessio D'Errico, Maria Maffei, Hannah M. Price, Maciej Lewenstein, Lorenzo Marrucci, Filippo Cardano, Alexandre Dauphin, Pietro Massignan
Summary: This paper investigates the analogy between the topological properties of Hofstadter Hamiltonians and the diffraction figures resulting from optical gratings. By establishing a one-to-one relation between Diophantine equations and the Bragg condition, the influence of structural disorder on the robustness of diffraction figures in optical gratings is discussed, which can be analogous to the robustness of transverse conductance in the quantum Hall effect.
NEW JOURNAL OF PHYSICS
(2022)
Article
Physics, Multidisciplinary
Magdalini Zonnios, Jesper Levinsen, Meera M. Parish, Felix A. Pollock, Kavan Modi
Summary: Motivated by the famous ink-drop experiment, the study proposes an experimentally implementable method for measuring the scrambling capacity of quantum processes. The researchers introduce a fully quantum version of the out of-time-order correlator, called the out-of-time-order tensor, which provides clear information about the chaoticity of a process.
PHYSICAL REVIEW LETTERS
(2022)
Article
Multidisciplinary Sciences
Jack B. Muir, Jesper Levinsen, Stuart K. Earl, Mitchell A. Conway, Jared H. Cole, Matthias Wurdack, Rishabh Mishra, David J. Ing, Eliezer Estrecho, Yuerui Lu, Dmitry K. Efimkin, Jonathan O. Tollerud, Elena A. Ostrovskaya, Meera M. Parish, Jeffrey A. Davis
Summary: Researchers introduced mobile exciton impurities into a two-dimensional electron gas and conducted experiments on monolayer WS2 using multi-dimensional coherent spectroscopy. They found that at low electron doping densities, the dominant interactions occur between polaron states dressed by the same Fermi sea. Additionally, they discovered a bipolaron bound state with remarkably large binding energy involving excitons in different valleys cooperatively bound to the same electron.
NATURE COMMUNICATIONS
(2022)
Article
Optics
Francesco Di Colandrea, Amin Babazadeh, Alexandre Dauphin, Pietro Massignan, Lorenzo Marrucci, Filippo Cardano
Summary: In this work, a method of photonic quantum walks using liquid-crystal meta-surfaces is reported, enabling ultra-long distance walks between hundreds of optical modes. By exploiting spin-orbit effects, this method allows for space-dependent polarization transformations and mixing of circularly polarized optical modes with quantized transverse momentum. By using only a few meta-surfaces, quantum walks up to 320 discrete steps are simulated without optical amplification, surpassing current state-of-the-art experiments. Rating: 9 points.
Article
Physics, Multidisciplinary
Hugo Cayla, Pietro Massignan, Thierry Giamarchi, Alain Aspect, Christoph I. Westbrook, David Clement
Summary: We measured the momentum density in a Bose-Einstein condensate (BEC) with dilute spin impurities and observed algebraic tails decaying as 1/k4 at large momentum k, which originated from impurity-BEC interactions. The amplitudes of these tails exceeded those expected from two-body contact interactions at equilibrium in the trap. These unexpected algebraic tails were found to originate from the nontrivial dynamics of the expansion in the presence of impurity-bath interactions.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Multidisciplinary
Di Huang, Kevin Sampson, Yue Ni, Zhida Liu, Danfu Liang, Kenji Watanabe, Takashi Taniguchi, Hebin Li, Eric Martin, Jesper Levinsen, Meera M. Parish, Emanuel Tutuc, Dmitry K. Efimkin, Xiaoqin Li
Summary: When mobile impurities are introduced and coupled to a Fermi sea, new quasiparticles called Fermi polarons are formed. There are two regimes of the Fermi polaron problem: attractive polarons (AP) connected to pairing phenomena, and repulsive polarons (RP) responsible for ferromagnetism. In this study, we investigate Fermi polarons in a doped MoSe2 monolayer and find agreement with polaron theory for attractive polarons. The dynamics of Fermi polarons are important for understanding pairing and magnetic instabilities in various physical systems.
Article
Physics, Multidisciplinary
Matteo Caldara, Andrea Richaud, Massimo Capone, Pietro Massignan
Summary: We have studied a superfluid in a planar annulus with vortices having massive cores. The analytical point-vortex model reveals that these massive vortices can have radial oscillations on top of their uniform precession. However, when the vortex mass exceeds a critical value, the oscillatory motion becomes unstable and the vortices are driven towards the edges of the annulus. By considering an analogy with the motion of a charged particle in a static electromagnetic field, we have developed a plasma orbit theory that accurately describes the trajectories even beyond the regime of small radial oscillations. These findings are supported by numerical solutions of coupled two-component Gross-Pitaevskii equations. We have also extended the analysis to a necklace of vortices symmetrically arranged within the annulus.
Article
Materials Science, Multidisciplinary
Sangeet S. Kumar, Meera M. Parish, Jesper Levinsen
Summary: We theoretically investigate the scenario of a semiconductor quantum well in a microcavity, where optically excited electron-hole pairs can form exciton polaritons via the exchange of microcavity photons rather than Coulomb interactions. Using a diagrammatic theory, we determine the spectral response of the semiconductor microcavity and obtain the conditions under which an exciton is bound by photon exchange. Our results are in good agreement with a recent experiment on doped quantum wells.
Article
Optics
Andrea Richaud, Pietro Massignan, Vittorio Penna, Alexander L. Fetter
Summary: We study the motion of a superfluid vortex in condensates with different background density profiles and propose an effective point-vortex model. Both empty-core and filled-core vortices are analyzed, and it is found that the presence of a core leads to the vortex acquiring mass. The dynamics of the vortex with the localized massive core is influenced by the energy dependence on the radial position and the trap potential.
Article
Optics
Nikolay Yegovtsev, Pietro Massignan, Victor Gurarie
Summary: This paper examines strong boson-impurity interactions with finite range in a Bose gas. It shows that for attractive impurity-boson interactions, including the unitary point, static properties of a Bose polaron in a dilute Bose gas can be calculated using the scattering length and an additional parameter characterizing the range of the interactions.
Article
Materials Science, Multidisciplinary
Emma Laird, Francesca M. Marchetti, Dmitry K. Efimkin, Meera M. Parish, Jesper Levinsen
Summary: Exciton-polaritons in a two-dimensional semiconductor heterostructure under a static magnetic field are investigated theoretically. The study employs a fully microscopic theory that incorporates electrons, holes, and photons, and utilizes a mapping technique to efficiently solve the problem numerically. The obtained results demonstrate the shrinking of exciton wave functions with increasing magnetic field, which reflects the enhancement of their interaction energy and oscillator strength.
Review
Physics, Atomic, Molecular & Chemical
Francesco Scazza, Matteo Zaccanti, Pietro Massignan, Meera M. Parish, Jesper Levinsen
Summary: This article provides an overview of the current theoretical and experimental understanding of the properties of repulsive polarons, which are quasiparticles formed by coupling a mobile impurity to the elementary excitations of a many-particle background. The study of these quasiparticles is important for understanding various quantum many-body systems in ultracold atomic gases and in the solid state. The article also highlights unresolved issues that deserve further investigation.
Article
Materials Science, Multidisciplinary
A. Tiene, J. Levinsen, J. Keeling, M. M. Parish, F. M. Marchetti
Summary: This article studies the optical absorption spectrum of doped two-dimensional semiconductors in the spin-valley polarized limit. It demonstrates that the three-body trion state must have p-wave symmetry and evaluates the optical properties of the system. It also explores the impact of different doping conditions on the system's optical properties.
Article
Optics
Monica A. Caracanhas, Pietro Massignan, Alexander L. Fetter
Summary: This study presents an investigation into the dynamics of superfluid vortices on general axisymmetric compact surfaces without any holes. By transforming the axisymmetric surface conformally to a plane, a general method is developed using hydrodynamic stream function. The research reveals that vortices constitute a Hamiltonian dynamical system with the angular positions on the surface serving as canonical variables. The dynamical motion conserves both the total energy and angular momentum, and it shows a significant anticorrelation between vortex speed and local surface curvature.
