Article
Physics, Multidisciplinary
Ettore Vitali, Peter Rosenberg, Shiwei Zhang
Summary: By leveraging cutting-edge numerical methodologies, this study investigates the ground state and properties of a two-dimensional spin-polarized Fermi gas in an optical lattice. The results provide strong evidence of the stability of the elusive Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) superfluid phase, and show the existence of density order in the system, suggesting the possibility of an intricate coexistence of long-range orders in the ground state. The study also points out significant differences between the ground-state properties and the standard mean-field description, providing a compelling avenue for future theoretical and experimental explorations of spin imbalance, strong interactions, and superfluidity in this exotic phase of matter.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Ethan Lake, T. Senthil
Summary: We study Fermi-Hubbard models with kinetically constrained dynamics in strongly tilted optical lattices, where interacting fermions are placed. Through analytics and numerics, we demonstrate how the kinetic constraints stabilize an exotic non-Fermi liquid phase described by fermions coupled to a gapless bosonic field that behaves like a dynamical gauge field in several aspects. This provides a novel approach to studying non-Fermi liquid phases in precision environments offered by ultracold atom platforms.
PHYSICAL REVIEW LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Ruipeng Li, Jonas von Milczewski, Atac Imamoglu, Rafal Oldziejewski, Richard Schmidt
Summary: We study induced pairing between two identical fermions mediated by an attractively interacting quantum impurity in two-dimensional systems. Based on a stochastic variational method (SVM), we investigate the influence of confinement and finite interaction range on the ground state of the quantum three-body problem. We find that confinement and a finite interaction range can enhance trimer stability and overcome Coulomb repulsion, opening possibilities for electron pairing beyond conventional paradigms.
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
Raul Bombin, Viktor Cikojevic, Juan Sanchez-Baena, Jordi Boronat
Summary: This study focuses on the repulsive Fermi polaron in a two-component, two-dimensional system of fermionic atoms, investigating properties such as polaron energy, quasiparticle residue, and effective mass using the diffusion Monte Carlo method. The results highlight the importance of considering the effective range and scattering length to reproduce experimental results, as well as the establishment of universality through different model potentials for the interaction between the Fermi sea and the impurity. This underscores the significance of quantum fluctuations and beyond mean-field effects in accurately describing the Fermi polaron problem.
Article
Physics, Multidisciplinary
Zhi-Qiang Jiao, Stefano Longhi, Xiao-Wei Wang, Jun Gao, Wen-Hao Zhou, Yao Wang, Yu-Xuan Fu, Li Wang, Ruo-Jing Ren, Lu-Feng Qiao, Xian-Min Jin
Summary: Symmetries play a crucial role in identifying topological phases and connecting protected edge states with topological bulk invariants through the bulk-boundary correspondence. One-dimensional lattices are believed to be protected by chiral symmetry, but this is not always the case. By experimentally detecting topological invariants in the bulk through continuous-time quantum walks of photons, it has been shown that inversion symmetry protects the quantized Zak phase but edge states may disappear in the topological nontrivial phase.
PHYSICAL REVIEW LETTERS
(2021)
Article
Optics
Jian-Te Wang, Peng He
Summary: We propose feasible schemes to realize topological phases with cold atoms in momentum-space lattices through carefully engineering artificial gauge potentials for neutral atoms. We demonstrate a Floquet approach to design momentum-space lattices with long-range hoppings, which can be applicable to realize the momentum-space Haldane model. We further show the realization of two-dimensional spin-orbit coupling for a spinful momentum-space lattice, arising from a general formulation of non-Abelian gauge potential.
Article
Physics, Multidisciplinary
T. Yanagisawa, H. Matsumori, H. Saito, H. Hidaka, H. Amitsuka, S. Nakamura, S. Awaji, D. Gorbunov, S. Zherlitsyn, J. Wosnitza, K. Uhlirova, M. Valiska, V Sechovsky
Summary: The study presents acoustic signatures of electric quadrupolar degrees of freedom in UNi4B, showing softening of the C-66 ultrasonic mode below 30 K and anisotropic elastic response within the honeycomb layer. Magnetic field-temperature phase diagrams suggest the role of electric quadrupolar degrees of freedom in magnetic toroidal dipole order and magnetic-field-induced phases.
PHYSICAL REVIEW LETTERS
(2021)
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
Physics, Multidisciplinary
Deepak Gaur, Hrushikesh Sable, D. Angom
Summary: In this research, we investigate the bosonic fractional quantum Hall (FQH) states in a two-dimensional optical lattice with a synthetic magnetic field, described by the bosonic Harper-Hofstadter Hamiltonian. We utilize cluster Gutzwiller mean-field and exact diagonalization techniques to study these states. We observe incompressible states resembling FQH states at various filling factors. Our particular focus is on the nu = 1/2 FQH state, characterized by the two-point correlation function and the many-body Chern number. Furthermore, we examine the impact of dipolar interaction on the nu = 1/2 FQH state, finding that it stabilizes the FQH state against the competing superfluid state.
FRONTIERS IN PHYSICS
(2023)
Article
Chemistry, Physical
Yihang Zeng, Zhengchao Xia, Roei Dery, Kenji Watanabe, Takashi Taniguchi, Jie Shan, Kin Fai Mak
Summary: In a heterostructure composed of WS2/bilayer WSe2/WS2 multilayers, it was discovered that strongly correlated bosons can be trapped in a triangular lattice. Correlated insulating states were observed when the electron filling factor of the two lattices reached 1/3, 2/3, 4/3, and 5/3. These states can be explained as exciton density waves in a Bose-Fermi mixture of excitons and holes. The strong repulsive interactions between the constituents led to the formation of robust generalized Wigner crystals, which restricted the exciton fluid to channels that spontaneously broke the translational symmetry of the lattice. These results demonstrate that Coulomb-coupled lattices are a fertile ground for studying correlated many-boson phenomena.
Article
Physics, Multidisciplinary
Yi-Yin Zheng, Shan-Tong Chen, Zhi-Peng Huang, Shi-Xuan Dai, Bin Liu, Yong-Yao Li, Shu-Rong Wang
Summary: We studied the stability of zero-vorticity and vortex lattice quantum droplets described by a 2D GP equation, finding the stability areas for different numbers of sites and vorticities. The relationship between mu and N for stable LQDs may violate the VK criterion, and two types of vortex LQDs with the same number of sites were found to be degenerate, while zero-vorticity LQDs were not. The offsite-centered LQDs with zero-vorticity and vortex LQDs with S = 1 were heterogeneous.
FRONTIERS OF PHYSICS
(2021)
Review
Mathematics, Interdisciplinary Applications
Fei-yan Zhao, Zi-teng Yan, Xiao-yan Cai, Chao-long Li, Gui-lian Chen, He-xiang He, Bin Liu, Yong-yao Li
Summary: The dynamical model of quantum droplets launched in a deep optical lattice is studied, and it is found that the hopping rate C plays a dominant role in characterizing the properties of the system. The system is divided into quasicontinuum (QC) and tightly-bound (TB) regions, with different characteristics and behaviors observed in each region. The effects of introducing synthetic gauge fields on the system are also explored, leading to the creation of stable staggered discrete QDs for the first time.
CHAOS SOLITONS & FRACTALS
(2021)
Article
Physics, Multidisciplinary
Xiang-Chuan Yan, Da-Li Sun, Lu Wang, Jing Min, Shi-Guo Peng, Kai-Jun Jiang
Summary: The experimental production of degenerate Fermi gases of Li-6 atoms in an optical dipole trap was successfully achieved, where atomic temperature was decreased using gray-molasses technique and evaporative cooling. The anisotropic expansion of the degenerate atom cloud in the strongly interacting regime was also observed during the study.
CHINESE PHYSICS LETTERS
(2021)
Article
Optics
Jose Carlos Pelayo, Karol Gietka, Thomas Busch
Summary: In distributed quantum sensing, correlations between multiple modes of a photonic system are used to improve the precision of measuring an unknown parameter. This study investigates the metrological potential of a multimode, tilted Bose-Hubbard system and demonstrates that it can achieve parameter estimation at the Heisenberg limit. By optimizing the initial state, the limit can be reached without requiring correlations between different modes. Furthermore, strategies are proposed to obtain quadratic dependence on the number of modes in a more realistic experimental setup.
Article
Chemistry, Multidisciplinary
Derek S. Wang, Susanne F. Yelin, Johannes Flick
Summary: This study demonstrates how to tune the optical properties of defects in solid-state materials via the formation of defect polaritons in an optical cavity from first principles. It shows significant polaritonic splitting and absorption intensity enhancement, potentially overcoming phonon-limited single-photon emission from defect centers. These findings are expected to inspire experimental investigations of strong light-matter coupling between defect centers and cavity photons for applications in quantum technologies.
Article
Physics, Condensed Matter
Eric Zou, Erik Long, Erhai Zhao
Summary: The capacity of restricted Boltzmann machines (RBMs) in learning the ground states of frustrated quantum spin Hamiltonians is demonstrated in this study. The research focuses on the ground states of a compass spin model on the honeycomb lattice, which unifies multiple spin models. The calculated results show that RBMs can effectively describe the complex magnetic orders with large unit cells.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2022)
Article
Optics
Robert A. McCutcheon, Susanne F. Yelin
Summary: There has been increasing interest in manipulating the refractive index recently, with a focus on enhancing the absolute-value limit of the linear index in coherent atomic systems. By exploring wave mixing as a possible solution to the limitations posed by two-level transitions, it was found that the frequencies of the involved transitions play a key role in changing the attainable index value, alongside the medium optical depth/density.
OPTICS COMMUNICATIONS
(2022)
Article
Chemistry, Physical
Derek S. Wang, Tomas Neuman, Susanne F. Yelin, Johannes Flick
Summary: This study explores the influence of an optical cavity on intramolecular vibrational energy redistribution and demonstrates that optical cavity resonance coupling can alter the rates of unimolecular dissociation reactions.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Optics
Derek S. Wang, Inci Anali, Susanne F. Yelin
Summary: This study demonstrates how hybridization and dipole-dipole interactions can couple different emitters into composite emitters with flexible control over the level structure, leading to the emission of frequency-entangled photons with Bell states and three-photon GHZ states.
Article
Multidisciplinary Sciences
Trond Andersen, Ryan J. Gelly, Giovanni Scuri, Bo L. Dwyer, Dominik S. Wild, Rivka Bekenstein, Andrey Sushko, Jiho Sung, You Zhou, Alexander A. Zibrov, Xiaoling Liu, Andrew Y. Joe, Kenji Watanabe, Takashi Taniguchi, Susanne F. Yelin, Philip Kim, Hongkun Park, Mikhail D. Lukin
Summary: Techniques to control the flow of light on subwavelength scales enable new optical systems and device applications. This study demonstrates a few-pixel beam steering device based on electrostatic gate control of excitons in an atomically thin semiconductor with strong light-matter interactions. The device achieves continuously tunable beam deflection, two-dimensional beam steering, and fast switching times down to 1.6 nanoseconds. This opens possibilities for atomically thin optical systems with rapidly switchable beam arrays and quantum metasurfaces.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Physical
Derek S. S. Wang, Johannes Flick, Susanne F. F. Yelin
Summary: Recent experiments have shown the potential to alter and steer chemical reactions in optical cavities, but the theoretical understanding remains limited. This paper focuses on the unimolecular dissociation reactions of multiple molecules interacting with an infrared cavity mode. The study reveals that increasing the number of aligned molecules can slow down the reaction rate if the cavity mode is resonant with a vibrational mode of the molecules. A scaling relation is also discovered to estimate the onset of reaction rate modification by collective vibrational strong coupling.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Quantum Science & Technology
Taylor L. Patti, Omar Shehab, Khadijeh Najafi, Susanne F. Yelin
Summary: This article introduces a method that combines classical Markov chain Monte Carlo techniques with variational quantum algorithms, allowing the algorithm to converge to global minima and improve solution quality. The effectiveness of the technique is demonstrated through quantum circuit simulations and tests on large-scale quantum models.
QUANTUM SCIENCE AND TECHNOLOGY
(2023)
Article
Optics
Samuel Buckley-Bonanno, Stefan Ostermann, Oriol Rubies-Bigorda, Taylor L. Patti, Susanne F. Yelin
Summary: The lattice geometry plays a crucial role in determining the effective decay rate for impurities, with the minimum effective decay rate appearing in lattices where the impurity's nearest neighbors are maximum and the number of distinct distances among nearest neighbors are minimal. In terms of impurity placement, interstitial placement consistently exhibits lower decay rates and longer photon storage compared to substitutional placement.
Article
Physics, Multidisciplinary
Taylor L. Patti, Jean Kossaifi, Anima Anandkumar, Susanne F. Yelin
Summary: Despite previous research efforts, there have been limited quantum algorithms that demonstrate an achievable quantum advantage for classical optimization. This study proposes a variational quantum algorithm that overcomes the challenges of high circuit depth and nonconvex optimization landscapes through multibasis graph encodings and nonlinear activation functions. The results show improved optimization performance and reduced qubit requirements. Moreover, the study introduces exact circuit representations using factorized tensor rings to mitigate the exponential scaling limitation of classical simulation of many qubits. The shallow circuits and efficient simulation enable successful optimization of the MaxCut problem on 512-vertex DIMACS library graphs using a single GPU. The research offers tangible progress for variational quantum optimization by improving performance, requiring fewer resources, and utilizing shallower and more error-resistant circuits.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Quantum Science & Technology
Rodrigo Araiza Bravo, Khadijeh Najafi, Xun Gao, Susanne F. Yelin
Summary: In this paper, a quantum version of a recurrent neural network is introduced, utilizing the natural Hamiltonian dynamics of spin-1/2 particles for computation. The study reveals that the quantum dynamics of the network provide it with quantum computational features that can be advantageous for tasks such as multitasking, decision making, and long-term memory.
Article
Physics, Multidisciplinary
Stefan Ostermann, Valentin Walther, Susanne F. Yelin
Summary: The studied quantum many-body system exhibits an amorphous phase due to the competition between two competing long-range interaction potentials with incommensurate length scales.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Physics, Multidisciplinary
Oriol Rubies-Bigorda, Valentin Walther, Taylor L. Patti, Susanne F. Yelin
Summary: This study demonstrates how to utilize lattice dark states in atomic arrays to store and retrieve single photons, as well as control the degrees of freedom of the emitted electromagnetic field. Furthermore, it shows how to manipulate information stored in the lattice by building coherent interactions between multiple dark states.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Materials Science, Multidisciplinary
Valentin Walther, Lida Zhang, Susanne F. Yelin, Thomas Pohl
Summary: Excitons in a semiconductor monolayer can reflect resonant light with high efficiency, and this study investigates the nonlinear optical properties of these excitonic mirrors. The research shows that interactions between excitons can generate highly nonclassical light, with two different scenarios described. The findings suggest promising applications in quantum photonics at the individual photon level.
Article
Materials Science, Multidisciplinary
James Bartlett, Haiping Hu, Erhai Zhao
Summary: The topological analysis of non-Hermitian systems with nonreciprocal hopping reveals the breakdown of conventional bulk-boundary correspondence due to the presence of point gaps and the skin effect. By introducing a winding number for systems with chiral symmetry, the correspondence can be restored. The study shows that a Z2 invariant derived from Majorana's representation can accurately predict the appearance of edge states between bulk gaps in systems lacking chiral symmetry.
