Article
Physics, Multidisciplinary
T. Dieterle, M. Berngruber, C. Hoelzl, R. Loew, K. Jachymski, T. Pfau, F. Meinert
Summary: The study investigates the transport dynamics of a single low-energy ionic impurity in a Bose-Einstein condensate by implanting the impurity using fast electric field pulses. The results show diffusive transport properties of the impurity and allow for the measurement of its mobility through comparison with simulations. This research opens up a new path for studying dynamics of charged quantum impurities in ultracold matter.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Applied
Dragan Mihailovic
Summary: In cuprate superconductors, a pronounced maximum of superconducting T-c is observed when the in-plane Cu-O distance is close to 1.92 angstroms. However, direct measurements of the electron-phonon coupling show a clear nonlinear relationship with T-c, contradicting conventional superconductivity theories. The observed crossover behavior suggests that T-c occurs at the crossover from weak to strong coupling, which is associated with carrier localization. The dynamic exchange of localized and itinerant carriers in a two-component superconductivity scenario is suggested to be the key to achieving high T-c.
JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM
(2022)
Article
Materials Science, Multidisciplinary
M. Ahsan Zeb
Summary: Fano resonance is a phenomenon where weak interaction between discrete and continuous excited states leads to asymmetric line shapes in the spectra. In the strong-coupling phase, the spectral function of the discrete state splits up and produces destructive interferences or zeros.
Article
Optics
Nils-Eric Guenther, Richard Schmidt, Georg M. Bruun, Victor Gurarie, Pietro Massignan
Summary: Research shows that in a dilute Bose-Einstein condensate, the quasiparticle residue of an impurity exponentially vanishes with increasing particle number, leading to an orthogonality catastrophe. By introducing a variational ansatz, it is possible to accurately describe the macroscopic dressing of mobile impurities, including their feedback onto the BEC and boson-boson repulsion beyond the Bogoliubov approximation. Furthermore, the prediction is made that the orthogonality catastrophe also occurs in the mobile case when the BEC becomes ideal, and experimental results have confirmed the accuracy of the ansatz.
Article
Optics
Rajiv R. P. Singh, Jaan Oitmaa
Summary: In this paper, we develop finite-temperature strong-coupling expansions for the SU(N) Hubbard model and use them to calculate the thermodynamic properties of the model at moderate and high temperatures over a wide parameter range.
Article
Physics, Applied
Chao-Wei Chen, Le-Di Chen, Cheng-Yao Li, Xiang-Yu Wu, Qing Cai, Ren-Hao Fan, Dong-Xiang Qi, Ru-Wen Peng, Mu Wang
Summary: In this work, the strong coupling of localized surface plasmons (LSPs) and intermolecular vibration mode at THz was observed, resulting in Rabi splitting effect. The measured data confirmed that the splitting originated from the strong coupling between LSPs and molecular vibration mode. This research also demonstrated the potential of implementing molecular concentration sensing based on this strong coupling effect.
APPLIED PHYSICS LETTERS
(2023)
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
Physics, Multidisciplinary
M. Will, G. E. Astrakharchik, M. Fleischhauer
Summary: The article presents a detailed study of heavy polarons in a one-dimensional Bose gas using a nonperturbative theory and exact numerical simulations. Analytic approaches for weak boson-boson interactions and strong impurity-boson couplings were developed, and the interaction potential of heavy polarons was found to deviate substantially from the exponential form in the strong coupling limit. Calculations of bipolaron binding energies for low impurity-boson mass ratios were in excellent agreement with quantum Monte Carlo results, taking into account Born-Huang corrections.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
Tuna Demircik, Christian Ecker, Matti Jaervinen
Summary: A novel framework for describing the equation of state of dense and hot QCD is presented, which is in good agreement with theoretical constraints at low and high densities and temperatures. The framework combines various models and theories, including gauge/gravity duality, lattice field theory, QCD perturbation theory, chiral effective theory, and statistical modeling.
Article
Astronomy & Astrophysics
Jan Horak, Jan M. Pawlowski, Jonas Turnwald, Julian M. Urban, Nicolas Wink, Savvas Zafeiropoulos
Summary: In this study, we computed the strong coupling constant of Landau gauge QCD using both direct calculation and spectral reconstruction in the full complex momentum plane. By considering the Taylor coupling, which is a product of ghost and gluon dressing functions, we found that the coupling also obeys a spectral representation. The spectral reconstruction of the coupling data was done using Gaussian process regression with analytically enforced asymptotics, based on spectral representations of ghost and gluon obtained from lattice QCD results and functional QCD data. The agreement between the direct calculation and the spectral reconstruction results demonstrates the reliability of the method.
Article
Physics, Multidisciplinary
Yijie Niu, Hongxing Xu, Hong Wei
Summary: In this study, we demonstrate the strong coupling of surface plasmon modes of metal nanowires and excitons in monolayer semiconductors, and validate this coupling through theoretical calculations and experimental results. These findings contribute to a deeper understanding of the spectral phenomena in the plasmon-exciton strong coupling regime.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Arthur Christianen, J. Ignacio Cirac, Richard Schmidt
Summary: In this study, the interaction between the polaron quasiparticle and chemical recombination in an atomic Bose-Einstein condensate (BEC) was investigated using a Gaussian state variational method. The results show that the polaron cloud contributes to the formation of bound states and leads to a shift of the Efimov resonance, indicating the onset of polaronic instability.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Wei Li, Renming Liu, Junyu Li, Jie Zhong, Yu-Wei Lu, Huanjun Chen, Xue-Hua Wang
Summary: A highly efficient approach for achieving strong coupling between single excitons and localized plasmon modes at room temperature is presented. By reducing the critical interaction strength at the exceptional point, rather than enhancing the coupling strength, the researchers were able to overcome the system's large damping. Experimental results showed a significant improvement in the success rate of achieving strong coupling, from about 1% to about 80%.
PHYSICAL REVIEW LETTERS
(2023)
Review
Chemistry, Multidisciplinary
Blake S. Simpkins, Adam D. Dunkelberger, Igor Vurgaftman
Summary: In this paper, the design of optical cavities, transient and modulated responses, and theoretical models relevant to vibrational strong coupling (VSC) are reviewed. The most common choice for experiments involving vibrational polaritons is planar Fabry-Perot cavities, but other choices have unique advantages. The nonlinear response to laser excitation, modulation methods, and theoretical approaches are also discussed.
Article
Chemistry, Physical
Monosij Mondal, Maicol A. Ochoa, Maxim Sukharev, Abraham Nitzan
Summary: The interaction between excited states of a molecule and excited states of a metal nanostructure leads to hybrid states with modified optical properties. The condition for strong coupling between plasmons and molecules can be easily satisfied if the only contributions to the spectral width are associated with the radiative and nonradiative relaxation of a single molecular vibronic transition. However, the observation of Rabi splitting becomes more challenging when the molecule-metal surface distance is varied due to the spectral shift associated with the same molecule-plasmon interaction.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Physics, Multidisciplinary
Zahra Baghali Khanian, Manabendra Nath Bera, Arnau Riera, Maciej Lewenstein, Andreas Winter
Summary: We extend the previous results on quantum thermodynamics to the case of multiple non-commuting charges and develop a resource theory of thermodynamics for asymptotically many non-interacting systems. The phase diagram of the system is formed by associating the vector of expected charge values and entropy with every state. Our key result is the Asymptotic Equivalence Theorem, which connects the equivalence classes of states under asymptotic charge-conserving unitaries with the points on the phase diagram. Using the phase diagram, we analyze the first and second laws of thermodynamics and provide insights into the storage of different charges in physically separate batteries.
ANNALES HENRI POINCARE
(2023)
Editorial Material
Physics, Multidisciplinary
Carlo Manzo, Gorka Munoz-Gil, Giovanni Volpe, Miguel Angel Garcia-March, Maciej Lewenstein, Ralf Metzler
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
(2023)
Article
Quantum Science & Technology
Lin Zhang, Utso Bhattacharya, Adrian Bachtold, Stefan Forstner, Maciej Lewenstein, Fabio Pistolesi, Tobias Grass
Summary: Quantum dots placed on a vibrating nanotube provide a platform for studying electron-phonon interactions, which has promising prospects for discovering new quantum materials and understanding strong correlation effects. By coupling the dots to an electronic reservoir, the state of the system can be easily prepared. Our study shows that for certain coupling strengths, the system undergoes a Peierls transition into an insulating regime with charge-density wave order in the steady state, resulting from the competition between electronic Coulomb repulsive interactions and phonon-induced attractive interactions. The transport phenomena observed can serve as fingerprints of electronic correlations. We also present powerful numerical methods to capture the physics of this open electron-phonon system with a large number of phonons. Our work paves the way for studying and detecting correlated electron-phonon physics with current experimental techniques in nanotube quantum simulators.
NPJ QUANTUM INFORMATION
(2023)
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
Quantum Science & Technology
Lorenzo Cardarelli, Sergi Julia-Farre, Maciej Lewenstein, Alexandre Dauphin, Markus Mueller
Summary: This work investigates a realistic scenario for the quantum simulation of interaction-induced topological phases using cold Rydberg-dressed atoms in optical lattices. The phase diagram of spinless fermions on a checkerboard lattice is analyzed in the mean-field approximation, and the stability of the phases with respect to temperature and quantum fluctuations is studied. An implementation protocol is proposed to access the topological properties of the model in state-of-the-art cold atom quantum simulators.
QUANTUM SCIENCE AND TECHNOLOGY
(2023)
Review
Physics, Multidisciplinary
Irenee Frerot, Matteo Fadel, Maciej Lewenstein
Summary: This review discusses methods for detecting and characterizing quantum correlations in many-body systems, with a focus on scalable approaches. It introduces concepts such as quantum entanglement, Einstein-Podolsky-Rosen steering, and Bell nonlocality, both in the bipartite scenario and their generalizations to multipartite cases. The review also covers recent progress in characterizing quantum correlations, experimental techniques for preparing and measuring highly-entangled many-body systems, and the challenges associated with each platform. It concludes with a list of open problems in the field.
REPORTS ON PROGRESS IN PHYSICS
(2023)
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
Piotr Sierant, Titas Chanda, Maciej Lewenstein, Jakub Zakrzewski
Summary: We investigate the dynamics of a single mobile impurity in a bath of Anderson localized particles in the regime of relatively strong disorder and interactions. We find that at short times, there is evidence of many-body localization, but at longer timescales, the impurity spreads subdiffusively and gradually delocalizes the Anderson insulator. The observed phenomenology includes subdiffusive growth of mean square displacement, power-law decay of density correlation functions, and power-law growth of entanglement entropy.
Article
Materials Science, Multidisciplinary
Piotr Sierant, Maciej Lewenstein, Antonello Scardicchio, Jakub Zakrzewski
Summary: We use a polynomially filtered exact diagonalization algorithm to study the many-body localization (MBL) transition in disordered Floquet systems. We focus on the disordered kicked Ising model and demonstrate quantitatively that finite-size effects at the MBL transition are less severe than in the random field XXZ spin chains commonly studied in the context of MBL. Our findings also apply to other disordered Floquet models, showing smaller finite-size effects than those observed in typical disordered autonomous spin chains. We observe consistent indications of the MBL transition for several indicators of ergodicity breaking in the kicked Ising model. Additionally, we find that assuming a power-law divergence of the correlation length at the MBL transition yields a critical exponent nu approximately equal to 2, in agreement with the Harris criterion for one-dimensional disordered systems.
Article
Physics, Multidisciplinary
Borja Requena, Gorka Munoz-Gil, Maciej Lewenstein, Vedran Dunjko, Jordi Tura
Summary: This paper proposes a novel approach that combines relaxation techniques with deep reinforcement learning to find the best possible bounds within a limited computational budget. The viability and effectiveness of the method are illustrated through benchmark tests on two paradigmatic problems in quantum physics and quantum information processing. The results show that the proposed approach has good feasibility and performance.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Materials Science, Multidisciplinary
Tomasz Szoldra, Piotr Sierant, Maciej Lewenstein, Jakub Zakrzewski
Summary: In this study, we introduce a correlation function difference (CFD) based on local density correlation functions for a one-dimensional spin system. By comparing correlations on a given site between a full system and its restriction, CFD provides useful information on transfer of information in quantum many-body systems. We investigate the examples of different phases in a disordered XXZ spin chain and find that CFD exhibits different behaviors in the ergodic and many-body localized regimes.
Article
Quantum Science & Technology
Philipp Stammer, Javier Rivera-Dean, Andrew Maxwell, Theocharis Lamprou, Andres Ordonez, Marcelo F. Ciappina, Paraskevas Tzallas, Maciej Lewenstein
Summary: Intense laser-matter interactions are of great interest in research and technology, playing important roles in atomic, molecular, and optical physics, as well as attosecond physics and ultrafast optoelectronics. Recent investigations have shown that these interactions can generate controllable high-photon-number entangled coherent states and coherent state superpositions. This tutorial provides a comprehensive fully quantized description of intense laser-atom interactions, covering processes such as high-harmonic generation and above-threshold ionization. It also discusses new phenomena that cannot be explained by semiclassical theories and explores the potential for quantum state engineering of light.
Article
Optics
Marlena Dziurawiec, Tanausu Hernandez Yanes, Marcin Plodzien, Mariusz Gajda, Maciej Lewenstein, Emilia Witkowska
Summary: Spin-squeezing protocols enable the generation of highly correlated quantum many-body states, which can enhance entanglement-inspired metrology and technologies. We investigate a quantum simulator utilizing twisting dynamics in a two-component Bose-Hubbard model with dipolar interactions. Our results demonstrate that the interplay of contact and long-range dipolar interactions in the superfluid phase activates an anisotropic two-axis countertwisting mechanism, accelerating spin-squeezing dynamics and achieving Heisenberg-limited accuracy in spectroscopic measurements.
Article
Astronomy & Astrophysics
Valentin Kasper, Torsten V. Zache, Fred Jendrzejewski, Maciej Lewenstein, Erez Zohar
Summary: Lattice gauge theories play a fundamental role in various fields such as particle physics, condensed matter, and quantum information theory. While recent advancements in controlling artificial quantum systems have allowed for studying Abelian lattice gauge theories in tabletop experiments, realizing non-Abelian models remains challenging. In this study, we propose a coherent quantum control scheme to enforce non-Abelian gauge invariance in a one-dimensional SU(2) lattice gauge system and discuss the potential extension to other non-Abelian gauge symmetries and higher spatial dimensions. The presented coherent control scheme holds promise for the quantum simulation of non-Abelian lattice gauge theories due to its wide applicability.
Article
Physics, Multidisciplinary
Luca Barbiero, Josep Cabedo, Maciej Lewenstein, Leticia Tarruell, Alessio Celi
Summary: We propose a scheme to realize a frustrated Bose-Hubbard model with ultracold atoms in an optical lattice that comprises the frustrated spin-1/2 quantum XX model. Our scheme utilizes a magnetic flux in a square ladder with one real and one synthetic spin dimension. Although this system does not have geometrical frustration, it can be mapped into an effective triangular ladder with staggered fluxes at low energies for specific values of synthetic tunneling. The scheme allows for minimal instances of frustrated magnets without the need for real geometrical frustration, in a setup of minimal experimental complexity.
PHYSICAL REVIEW RESEARCH
(2023)
