Article
Physics, Multidisciplinary
Mitchell J. Knight, Harry M. Quiney, Andy M. Martin
Summary: This paper describes the variational determination of the two-fermion reduced density matrix for harmonically trapped, ultracold few-fermion systems in one dimension with equal spin populations. The problem is formulated as a semi-definite program subject to N-representability conditions. The ground-state energies, density, pair-correlation function, and eigenvalues of the 2-RDM are found using an augmented Lagrangian method. The results show that this method accurately describes the salient features of the systems and has the potential to handle larger systems.
NEW JOURNAL OF PHYSICS
(2022)
Article
Physics, Multidisciplinary
G. Bougas, S. Mistakidis, P. Giannakeas, P. Schmelcher
Summary: The few-body correlations emerging in two-dimensional harmonically trapped mixtures were comprehensively investigated, revealing the formation of atom-dimer and trap states, in addition to trimers. The Tan's contacts of these eigenstates were studied, showing enhanced correlations in trimer states compared to other eigenstates. An upper bound was found in the two-body contact of atom-dimer and trap states, while no such bound existed in the three-body contact.
NEW JOURNAL OF PHYSICS
(2021)
Article
Optics
Jinzhu Jiang, Jia-Hui Zhang, Feng Mei, Zhonghua Ji, Ying Hu, Jie Ma, Liantuan Xiao, Suotang Jia
Summary: The recent experimental realization of optical tweezer arrays of ultracold molecules has provided a versatile platform for exploring different molecular phases of matter. By programming tweezers, researchers have been able to tailor dipolar interactions in an optical tweezer ladder to implement a generalized Su-Schrieffer-Heeger model, leading to the discovery of various chiral and interacting topological phases with richer topological edge states. Detection and robustness of these topological phases have also been discussed.
Article
Optics
K. K. Kesharpu, E. A. Kochetov
Summary: This paper solves the t-J Hamiltonian of the spinful hard-core bosonic ring in the Nagaoka limit and finds that the energy spectrum becomes quantized due to the presence of spin. The ground state is true ferromagnetic when the ring contains 2 or 3 spinful hard-core bosons, and a mixture of ferromagnetic and nonferromagnetic states for other cases. The paper also discusses the analogies between intrinsic spin-generated gauge fields and synthetic gauge fields generated by rotation of either the condensate or the confining potential, and explores possible experimental verifications of these results.
Article
Chemistry, Physical
Adrien Devolder, Timur V. Tscherbul, Paul Brumer
Summary: This study investigates the coherent control of ultracold molecule-molecule scattering influenced by a dense set of rovibrational resonances. A simple model based on multichannel quantum defect theory is used to characterize the resonance spectrum and analyze the control of scattering cross section and reaction rate. The results show that complete control is possible around resonance energies, but thermal averaging reduces the control range of reaction rates due to the random distribution of optimal control parameters among resonances. Measuring the extent of coherent control can provide meaningful information about the relative contribution of direct scattering versus collision complex formation and the statistical regime.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Physics, Multidisciplinary
Thomas Kohlert, Sebastian Scherg, Pablo Sala, Frank Pollmann, Bharath Hebbe Madhusudhana, Immanuel Bloch, Monika Aidelsburger
Summary: Intriguingly, quantum many-body systems can exhibit nonergodic behavior even in the absence of disorder. The tilted one-dimensional Fermi-Hubbard model is shown to naturally realize distinct effective Hamiltonians that support nonergodic behavior due to fragmentation. The observed dynamics in experimentally accessible parameter ranges suggest a pronounced dependence of the relaxation dynamics on the initial doublon fraction, revealing the microscopic processes of the fragmented model. These findings are significant for future studies of nonergodic behavior in higher dimensions.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Multidisciplinary
Donghao Liu, Gu Zhang, Zhan Cao, Hao Zhang, Dong E. Liu
Summary: The paper discusses the Majorana search and proposes a method using a dissipative probe to generate electron-boson interaction. It shows distinct universal zero-bias conductance behaviors for different types of Andreev reflections compared to Majorana zero modes. Specific cases are studied to help identify subgap states in experiments and promote the identification of Majorana zero modes.
PHYSICAL REVIEW LETTERS
(2022)
Article
Optics
Jianwen Jie, Yonghong Yu, Dajun Wang, Peng Zhang
Summary: By combining a real magnetic field with a laser-induced species-dependent synthetic magnetic field, it is possible to control the interspecies singlet-pairing process in a mixture of ultracold spin-1 atoms, enhancing this process while suppressing other spin-changing processes. This approach is useful for precise measurement of weak singlet-pairing interaction strength and generation of entanglement between two different atoms.
Article
Physics, Multidisciplinary
Bugra Tuzemen, Tomasz Zawislak, Gabriel Wlazlowski, Piotr Magierski
Summary: We investigate the properties of spin-imbalanced ultracold Fermi gas at low temperatures over a wide range of spin polarizations. We employ microscopic calculations using mean-field and density functional theory approaches without any symmetry constraints. At low polarization values, the system is predicted to consist of multiple spin-polarized droplets. As the polarization increases, the system self-organizes into disordered structures resembling liquid crystals and can energetically compete with ordered structures like grid-like domain walls. Further increasing polarization leads to the development of regularities that can be considered as supersolid, where periodic density modulation and pairing correlations coexist. The robustness of the results has been verified against temperature effects, dimensionality, and the presence of a trapping potential. Dynamical stability has also been investigated.
NEW JOURNAL OF PHYSICS
(2023)
Article
Physics, Multidisciplinary
K. Roux, V Helson, H. Konishi, J. P. Brantut
Summary: This paper reports the fast production and weakly destructive detection of a Fermi gas with tunable interactions in a high finesse cavity. The cavity is used to create an optical dipole trap and to reach the strong light-matter coupling regime, allowing for the observation of slow atom-number variations and the study of strongly correlated quantum matter.
NEW JOURNAL OF PHYSICS
(2021)
Article
Multidisciplinary Sciences
Hon Wai Hana Lau, Jorn Davidsen, Christoph Simon
Summary: We propose a conservative Hamiltonian system with nonlocal hopping, which can exhibit chimera patterns. We also propose a possible experimentally realizable quantum system based on a two-component Bose-Einstein condensate with a spin-dependent optical lattice, where nonlocal spatial hopping over tens of lattice sites can be achieved and simulations suggest that chimera patterns should be observable in certain parameter regimes.
SCIENTIFIC REPORTS
(2023)
Article
Physics, Multidisciplinary
Javier del Pino, Oded Zilberberg
Summary: The quantum simulation of dynamical gauge field theories allows for studying complex high-energy physics using controllable low-energy devices. In this study, we demonstrate the use of bosonic codes to simulate dynamical gauge fields by encoding matter and gauge fields in a network of resonators coupled via three-wave mixing. Our findings provide insights into preserving necessary gauge symmetries and promote the realization of high-energy models using bosonic codes.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Multidisciplinary
Xiaoxia Li, Qili Li, Tongzhou Ji, Ruige Yan, Wenlin Fan, Bingfeng Miao, Liang Sun, Gong Chen, Weiyi Zhang, Haifeng Ding
Summary: In this study, Lieb lattices were constructed using scanning tunneling microscopy and the electronic properties were probed by observing the electron wavefunction overlap between iron atoms. The observed long-range overlap is attributed to the surface state.
CHINESE PHYSICS LETTERS
(2022)
Article
Multidisciplinary Sciences
An Wang, Feng Du, Yongjun Zhang, David Graf, Bin Shen, Ye Chen, Yang Liu, Michael Smidman, Chao Cao, Frank Steglich, Huiqiu Yuan
Summary: Ferromagnetic quantum criticality was observed in CeRh6Ge4 under moderate hydrostatic pressure, supported by quantum oscillation measurements. The study found that Ce 4f electrons remain localized and do not contribute to the Fermi surface, suggesting localized ferromagnetism as a key factor for the occurrence of a ferromagnetic quantum critical point in CeRh6Ge4.
Article
Physics, Multidisciplinary
Jianying Du, Tong Fu, Jingyi Chen, Shanhe Su, Jincan Chen
Summary: A self-reliant quantum cooler without external control is proposed in this study. By establishing models to study the thermal transport properties of quantum systems interacting with baths, it is found that an unbalanced system coupled with ultracold quantum gases can achieve steady heat flow, and the cooling rate can be enhanced by quantum coherence.
PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS
(2022)
Article
Physics, Multidisciplinary
K. Kwon, K. Mukherjee, S. J. Huh, K. Kim, S. Mistakidis, D. K. Maity, P. G. Kevrekidis, S. Majumder, P. Schmelcher, J-y Choi
Summary: Star-shaped surface patterns are experimentally observed in driven Bose-Einstein condensates, with varying symmetries and instability in certain modes. The oscillation amplitude increases exponentially during modulation, with only the l=6 mode being unstable. Experimental results are in excellent agreement with the mean-field framework.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
Jie Chen, Simeon Mistakidis, Peter Schmelcher
Summary: In this study, we investigate the polaronic properties of a single impurity immersed in a weakly interacting bosonic environment confined within a one-dimensional double-well potential using an exact diagonalization approach. We find that the occurrence of the polaron orthogonality catastrophe is signified by a vanishing residue with an increase of the impurity-bath coupling. We obtain the asymptotic configurations of the systems' ground state wave function in the strongly interacting regime by means of a Schmidt decomposition, which accounts for the observed orthogonality catastrophe of the polaron.
NEW JOURNAL OF PHYSICS
(2022)
Article
Physics, Multidisciplinary
Fabian Brauneis, Timothy G. Backert, Simeon Mistakidis, Mikhail Lemeshko, Hans-Werner Hammer, Artem G. Volosniev
Summary: In this study, we investigate the ground-state properties of weakly repulsive one-dimensional bosons in the presence of an attractive zero-range impurity potential. We find that there are two cases: all bosons are bound to the impurity or all bosons are in a scattering state, and we derive the critical line that separates these cases in the parameter space. The critical line determines the maximum number of bosons that can be bound by the impurity potential in the thermodynamic limit, forming an artificial atom.
NEW JOURNAL OF PHYSICS
(2022)
Article
Physics, Multidisciplinary
S. Mistakidis, G. M. Koutentakis, F. Grusdt, P. Schmelcher, H. R. Sadeghpour
Summary: In this study, we investigate the formation and phase diagram of magnetic Bose polaron in a one-dimensional spinor Bose gas. The residue of magnetic polarons decreases significantly with strong impurity-spin interactions. Impurities can be utilized to manipulate spin polarization and suppress spin-spin correlations in the magnetic medium.
NEW JOURNAL OF PHYSICS
(2022)
Article
Optics
Jie Chen, Simeon Mistakidis, Peter Schmelcher
Summary: We investigate the correlated quantum quench dynamics of a single impurity immersed in a bosonic environment confined in a one-dimensional double-well potential. By analyzing the time-evolved many-body wave function, we find that a two-fold fragmented many-body state is dynamically formed when the impurity interacts with the non-interacting bosonic bath. However, increasing the strength of the impurity-bath coupling leads to the destruction of the two-fold fragmentation due to additional inter-band excitation dynamics.
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS
(2023)
Article
Physics, Multidisciplinary
Vasil Rokaj, Simeon I. Mistakidis, H. R. Sadeghpour
Summary: Cavity quantum electrodynamics allows manipulation and control of light-matter interactions by engineering polariton quasiparticles. This study focuses on collective phenomena in a system of multiple particles coupled to a homogeneous cavity vacuum field. The collective interaction with the cavity field gives rise to emergent polariton states and enhanced localization in the matter ground state density. Moreover, the light-matter interaction leads to modifications in the photonic properties of the polariton system, including the population of bunched photons and the necessity of the diamagnetic A2 term for system stability. The coherent transfer of polaritonic population can be achieved through an external magnetic field and monitoring the Landau-Zener transition probability.
Article
Physics, Multidisciplinary
Ceren B. Dag, Simeon I. Mistakidis, Amos Chan, H. R. Sadeghpour
Summary: In quantum chaotic systems, the spectral form factor (SFF) follows random matrix theory (RMT) predictions, with a 'ramp' followed by a 'plateau' in late times. However, recent studies have shown a deviation from RMT known as the 'bump' in random quantum circuits. This study demonstrates the 'bump-ramp-plateau' behavior in several one-dimensional cold-atom models and investigates the sensitivity of the scaling and bump amplitude to atom number.
COMMUNICATIONS PHYSICS
(2023)
Article
Optics
G. C. Katsimiga, S. I. Mistakidis, G. N. Koutsokostas, D. J. Frantzeskakis, R. Carretero-Gonzalez, P. G. Kevrekidis
Summary: We investigate the existence and stability properties of dark soliton solutions in homonuclear symmetric Bose mixtures, extending from trapped quantum droplets to the Thomas-Fermi limit. Using phase-plane analysis, we identify the existence regimes of different types of quantum droplets and explore the possibility of black and gray solitons and kink-type structures. We also determine the oscillation frequency of a single dark soliton in the Gross-Pitaevskii model and find that multisoliton configurations exhibit oscillatory instabilities.
Article
Optics
I. A. Englezos, S. I. Mistakidis, P. Schmelcher
Summary: We study one-dimensional harmonically confined quantum droplets in two-component mixtures using a nonperturbative approach. In symmetric homonuclear settings, beyond-Lee-Huang-Yang correlations result in flat-top droplet configurations for decreasing intercomponent attraction or larger atom number. Asymmetric mixtures feature spatial mixing and the more strongly interacting or heavier component exhibits flat-top structures. Quenches on the harmonic trap trigger the lowest-lying collective droplet excitations, and the interaction-dependent breathing frequency shows a decreasing trend for stronger attractions. Predictions within the Lee-Huang-Yang framework are obtained. Relatively large quench amplitudes cause delocalization of the droplet, higher-lying motional excitations in its core, enhanced intercomponent entanglement, and long-range correlations. In contrast, the dipole motion remains robust. Species-selective quenches lead to dephasing or irregular dipole patterns due to intercomponent collisions.
Article
Optics
G. C. Katsimiga, S. I. Mistakidis, K. Mukherjee, P. Schmelcher, P. G. Kevrekidis
Summary: This paper investigates the existence, stability, and quench-induced dynamics of vortex-bright type excitations in two-dimensional harmonically confined spin-1 Bose-Einstein condensates. Linearly stable vortex-bright-vortex and bright-vortex-bright solutions occur in both antiferromagnetic and ferromagnetic spinor gases with variations in the quadratic Zeeman energy shift. The deformations of these solutions during relevant transitions are discussed, revealing that emergent instabilities can lead to pattern formation. The study also unveils spatial elongations, precessional motion, and spiraling of the nonlinear excitations when exposed to finite temperatures and crossing distinct phase boundaries via quenching of the quadratic Zeeman coefficient. Spin-mixing processes triggered by the quench result in changes in the waveform of the configurations. The findings highlight the interplay between pattern formation and spin-mixing processes in contemporary cold atom experiments.
Article
Physics, Multidisciplinary
S. Halder, K. Mukherjee, S. I. Mistakidis, S. Das, P. G. Kevrekidis, P. K. Panigrahi, S. Majumder, H. R. Sadeghpour
Summary: We investigate the quench dynamics of dipolar Bose-Einstein condensates of 164Dy atoms under a fast rotating magnetic field. Quantum fluctuations and dipolar interactions play important roles in the formation of exotic quantum droplet and supersolid phases. By tuning the dipolar anisotropy using the rotated magnetic field, we observe the transition from the superfluid phase to the supersolid phase and the formation of droplet lattices. The inclusion of losses due to three-body recombination is also taken into account.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Optics
Friethjof Theel, Simeon Mistakidis, Kevin Keiler, Peter Schmelcher
Summary: We investigate the dynamics of two correlated impurities in a double well coupled to a one-dimensional bosonic medium. By studying the entanglement between the impurities and the medium, as well as the impurities' two-body correlations, we determine the ground-state phase diagram of the system. Our results show that the impurity structures and the intervals of existence strongly depend on the interactions between the impurities and the external confinement of the medium.
Article
Optics
A. Romero-Ros, G. C. Katsimiga, S. I. Mistakidis, B. Prinari, G. Biondini, P. Schmelcher, P. G. Kevrekidis
Summary: This study demonstrates the potential for realizing the Peregrine soliton structure through theoretical and numerical simulations based on the experimental realization of the Townes soliton in a two-component Bose-Einstein condensate. By initializing the condensate with a suitable spatial density pattern, the robust emergence of the Peregrine wave is observed in different scenarios. The study also reveals that narrower wave packets can lead to periodic revivals of the Peregrine soliton, while broader ones give rise to a cascade of Peregrine solitons arranged in a specific structure. The persistence of these rogue-wave structures is demonstrated in certain temperature regimes and in the presence of transversal excitations. The findings offer insights into the practical feasibility of generating and observing rogue waves in ultracold atom experimental settings.
Article
Physics, Atomic, Molecular & Chemical
Georgios M. Koutentakis, Simeon Mistakidis, Peter Schmelcher
Summary: Recent studies have shown that higher than two-body bath-impurity correlations are not crucial for quantitatively describing the ground state of the Bose polaron. In this study, the Gross Ansatz approach is used to investigate the stationary and dynamical properties of the one-dimensional Bose-polarn with different impurity momenta and bath-impurity couplings. The results demonstrate the transition of the equilibrium state from the quasi-particle Bose polaron regime to the collective-excitation stationary dark-bright soliton with varying impurity momentum and interactions. The temporal orthogonality catastrophe is observed after an interspecies interaction quench, provided that bath-impurity interactions are stronger than intraspecies bath ones. This catastrophe is caused by the formation of dispersive shock wave structures associated with the zero-range character of the bath-impurity potential. Additionally, a momentum transfer process from the impurity to the dispersive shock waves via the exerted drag force is demonstrated for initially moving impurities, resulting in a final polaronic state with reduced velocity.
Article
Physics, Multidisciplinary
Friethjof Theel, Kevin Keiler, Simeon Mistakidis, Peter Schmelcher
Summary: This study investigates the many-body dynamics of a harmonically trapped impurity colliding with a bosonic medium, revealing different behaviors of the impurity depending on the strength of the interaction. Strong attractions lead to binding, intermediate attractions result in effective tunneling, weak attractions or repulsions lead to penetrating and dissipative motion, and strong repulsions cause total reflection by the medium.
PHYSICAL REVIEW RESEARCH
(2021)
