Article
Physics, Multidisciplinary
Xiao-Tong Lu, Tao Wang, Ting Li, Chi-Hua Zhou, Mo-Juan Yin, Ye-Bing Wang, Xue-Feng Zhang, Hong Chang
Summary: By modulating the frequency and Rabi frequency in an optical lattice clock system, the interference between two Floquet channels was observed, demonstrating the relation between the effective Floquet Hamiltonian and a one-dimensional topological insulator with a high winding number. This experiment not only provides a direction for detecting phase effects, but also paves the way for simulating quantum topological phases in the OLC platform.
PHYSICAL REVIEW LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Chenyue Wen, Xingchuan Zhu, Ning Hao, Huaiming Guo, Shiping Feng
Summary: This study investigates the unconventional ferromagnetism and superconductivity in the imbalanced kagome-lattice Hubbard model using mean-field theory and determinant quantum Monte Carlo method. It reveals the intrinsic presence of spin-z ferromagnetic order and its interaction-induced enhancement and destruction. The development of xy-plane ferromagnetism is found to be above a critical interaction, and its possible superconducting state exhibits a triplet f-wave pairing symmetry. These findings provide important insights into the interplay between electronic correlations and geometry frustrations on the kagome lattice.
Article
Physics, Multidisciplinary
S. Flannigan, L. Madail, R. G. Dias, A. J. Daley
Summary: This research investigates the properties of cold atoms in an optical Lieb lattice and explores how experiments can observe the robustness of edge states and achieve strongly correlated many-body phases. The study further extends these findings to a half-filled 1D Lieb ladder and examines the impact of interactions on correlations.
NEW JOURNAL OF PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Francesco Ferrari, Federico Becca, Roser Valenti
Summary: This study investigates the ground state properties of the Hubbard model on the kagome lattice with both on-site U and nearest-neighbor V Coulomb repulsion at van Hove filling. The results reveal the presence of different interaction-driven charge density waves (CDWs) and the absence of ferromagnetism and charge or spin-bond order. The CDWs triggered by the nearest-neighbor repulsion have charge disproportionations that are not in line with experimental observations in AV3Sb5. Additionally, electron-phonon interaction is considered as an alternative mechanism to stabilize charge-bond order, leading to findings that are closer to experimental results.
Article
Quantum Science & Technology
Wentao Chen, Shuaining Zhang, Jialiang Zhang, Xiaolu Su, Yao Lu, Kuan Zhang, Mu Qiao, Ying Li, Jing-Ning Zhang, Kihwan Kim
Summary: This article introduces a quantum error mitigation method called probabilistic error cancellation (PEC), which can be applied to various quantum hardware platforms and quantum algorithms. Researchers attempt to benchmark PEC in trapped-ion qubits to improve simulation fidelity and observe the dynamics of the Fermi-Hubbard model.
NPJ QUANTUM INFORMATION
(2023)
Article
Optics
Pierpaolo Fontana, Joao C. Pinto Barros, Andrea Trombettoni
Summary: We propose a scheme for quantum simulation of quantum link models in two-dimensional lattices using spinor dipolar gases. Our scheme involves one-dimensional chains coupled by dipolar interactions and requires at least four levels. The parameters of the quantum link models are derived using two different approaches, one nonperturbative and tied to angular-momentum conservation, and the other perturbative. The extension to three-dimensional lattices is also discussed.
Article
Multidisciplinary Sciences
Daniel Shaffer, Jian Wang, Luiz H. Santos
Summary: In this work, we demonstrate through a renormalization group analysis that the combination of repulsive interactions and a tunable manifold of Van Hove singularities provides a new mechanism for driving unconventional superconductivity in Hofstadter bands. Our findings establish Hofstadter quantum materials like moire heterostructures as promising platforms for realizing novel reentrant Hofstadter superconductors.
NATURE COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Diana Csontosova, Jiri Chaloupka, Hiroshi Shinaoka, Atsushi Hariki, Jan Kunes
Summary: The spin excitation spectra of SrRu2O6 are studied using density functional plus dynamical mean-field theory, and a good quantitative agreement with experimental results is found. Depending on the size of the Hund's coupling JH, the system exhibits either a Mott insulator or covalent insulator state when magnetic ordering is not allowed. The nature of the paramagnetic state has a negligible influence on the charge and spin excitation spectra, while antiferromagnetic correlations hide the covalent insulator state for realistic choices of the interaction parameters.
Article
Physics, Multidisciplinary
Ganiyu D. Adebanjo, P. E. Kornilovitch, J. P. Hague
Summary: This study investigates the formation and condensation of fermion pairs in cold-atom quantum simulators, predicting small and light pairs. Pair mass, radius, and binding conditions are calculated, and transition temperatures are computed. The research predicts that local pairs form in BCC optical lattices with large binding energies, and that pairs of 6Li atoms Bose-Einstein condense at temperatures around 10 nK.
Review
Chemistry, Multidisciplinary
Sai Li, Wang Kang, Xichao Zhang, Tianxiao Nie, Yan Zhou, Kang L. Wang, Weisheng Zhao
Summary: Improvements in computing performance have slowed down due to hardware limitations in recent years, while the demand for data computing has increased exponentially. Attention has been focused on scaling Moore's law and advanced non-von Neumann computing architecture, with a variety of unconventional computing paradigms devised with the rapid development of nanoscale devices. Magnetic skyrmions, seen as potential candidates for unconventional computing due to their small size and unique properties, have attracted significant interest.
MATERIALS HORIZONS
(2021)
Article
Materials Science, Multidisciplinary
Jie Liu, Carlo Danieli, Jianxin Zhong, Rudolf A. Roemer
Summary: In the three-dimensional generalized Lieb models, uncorrelated disorder destroys the macroscopic degeneracy of the flat bands. However, by introducing a mix of order and disorder, this degeneracy can be preserved and the compactly localized states can be maintained.
Article
Materials Science, Multidisciplinary
Narayan Mohanta, Elbio Dagotto
Summary: This article presents a general method to induce exotic magnetic phases using interfacial phase frustration within artificially grown superlattices. Three unconventional magnetic phases are obtained through Monte Carlo calculations, and these frustration-induced phases can greatly enhance the spin chirality-driven topological Hall conductivity. This method provides a playground to realize unconventional magnetic phases in any family of materials that can be grown in superlattices.
NPJ QUANTUM MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Ansgar Graf, Frederic Piechon
Summary: Flat bands on periodic lattices are characterized by macroscopically degenerate eigenstates, and a method to build flat-band tight-binding models with short-range hoppings on any periodic lattice is presented in this work. The resulting models exhibit flat bands as well as multifold band touching points, which can be controlled in terms of number, location, degeneracy, and singularity. Various types of flat-band models can be constructed, including quadratic models from any arbitrary compact localized state and linear models from specific compatibility relations with the lattice structure.
Article
Physics, Multidisciplinary
R. Cardman, G. Raithel
Summary: This study develops and demonstrates a spectroscopic method for Rydberg-Rydberg transitions using a phase-controlled laser field. The method enables the detection of Rydberg transitions with less-restrictive selection rules and provides Doppler-free spectra with narrow linewidths. This new method opens up possibilities for high-precision spectroscopy and qubit manipulation in Rydberg-based systems.
PHYSICAL REVIEW LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Fabian Schrodi, Peter M. Oppeneer, Alex Aperis
Summary: The conventional understanding that electron-phonon interaction cannot lead to unconventional superconductivity needs to be revised, as more complex theories suggest that EPI may serve as a mediator for unconventional and high-Tc superconductivity.
Article
Quantum Science & Technology
Noah Van Horne, Dahyun Yum, Tarun Dutta, Peter Haenggi, Jiangbin Gong, Dario Poletti, Manas Mukherjee
NPJ QUANTUM INFORMATION
(2020)
Article
Physics, Multidisciplinary
Bo Xing, Wei-Ting Chiu, Dario Poletti, R. T. Scalettar, George Batrouni
Summary: A new generation of quantum simulations has expanded our understanding of charge density wave phase transitions. The SSH Hamiltonian describes a scenario where phonons exist on bonds and modulate electron hopping. Results for the 2D SSH model show the presence of a bond ordered wave insulator at half filling, with a critical value of electron-phonon coupling required for its onset.
PHYSICAL REVIEW LETTERS
(2021)
Article
Mathematics, Applied
Xiansong Xu, Dario Poletti
Summary: The study reveals that the natural orbitals of the steady state single-particle density matrix are localized for both weak and strong interactions in the presence of strong disorder. In contrast, the steady-state occupation tends to be more evenly spread with strong disorder or stronger interactions. Strong dissipation increases coherence of the steady states, leading to reduced localization signatures.
Article
Computer Science, Interdisciplinary Applications
Heitor P. Casagrande, Dario Poletti, Gabriel T. Landi
Summary: This article introduces an implementation based on matrix product state and tensor network methods for studying the complex properties of one-dimensional quantum systems coupled to multiple reservoirs. The method produces accurate results and is suitable for studying thermal transport. Through a case study using the XXZ quantum spin chain, the effectiveness of the implementation is demonstrated.
COMPUTER PHYSICS COMMUNICATIONS
(2021)
Article
Physics, Multidisciplinary
Andreas Burger, Leong Chuan Kwek, Dario Poletti
Summary: This study investigates how to simulate open quantum dynamics in a digital quantum computer, showing that simulating the unitary portion of the dynamics is key while the dissipative part can lead to a more noise-resistant simulation.
Review
Physics, Multidisciplinary
Gabriel T. Landi, Dario Poletti, Gernot Schaller
Summary: Recent years have witnessed significant progress in the theoretical understanding of quantum systems driven dissipatively by coupling to different baths. This progress has been possible due to advancements in models, methods, and analysis of emerging phenomena. This review provides a comprehensive overview of these three integrated research directions. It first gives an overarching view of boundary-driven open quantum system models in both weak and strong coupling regimes. It then reviews state-of-the-art analytical and numerical methods that are exact, perturbative, and approximate. Lastly, it discusses transport properties of paradigmatic one-dimensional chains, with a focus on disordered and quasiperiodic systems, rectification and negative differential conductance, phase transitions, and provides an outlook on further research options.
REVIEWS OF MODERN PHYSICS
(2022)
Article
Mathematics
Yangjun Wu, Xiansong Xu, Dario Poletti, Yi Fan, Chu Guo, Honghui Shang
Summary: In this paper, a single-layer fully connected neural network called tanh-FCN is proposed as a tool to solve ab initio quantum chemistry problems, adapted from the restricted Boltzmann machine (RBM). The network represents real electronic wave functions using real numbers, achieving comparable precision to RBM for various molecules. Additionally, the authors show that knowledge of the Hartree-Fock reference state can be utilized to accelerate the convergence of the variational Monte Carlo algorithm and improve the energy precision.
Article
Materials Science, Multidisciplinary
Chunhan Feng, Bo Xing, Dario Poletti, Richard Scalettar, George Batrouni
Summary: In this Letter, numerical studies are performed on the square lattice optical Su-Schrieffer-Heeger-Hubbard model, and the phase transition behavior is demonstrated. The results show that, under certain conditions, the interaction between the Hubbard model and the SSH model can directly transform into an antiferromagnetic phase and a bond-ordered wave.
Article
Optics
Xiansong Xu, Chu Guo, Dario Poletti
Summary: This study investigates the typical emergence of nonequilibrium quasi-steady current and its prethermalization mechanism between two nonintegrable systems.
Article
Materials Science, Multidisciplinary
Bo Xing, Xiansong Xu, Vinitha Balachandran, Dario Poletti
Summary: In this study, a two-legged ladder structure is considered, and the energy conversion efficiency and power generation for different energy spectra are investigated. The results show that the type of underlying energy spectrum significantly affects the performance efficiency and generated power, with the optimal scenario being the presence of a gap between the energy bands and a degenerate ground state.
Article
Physics, Fluids & Plasmas
Kang Hao Lee, Vinitha Balachandran, Chu Guo, Dario Poletti
Summary: This study investigates the transport and spectral properties of a segmented diode formed by an XX+XXZ spin chain. Numerical evidence shows that the system exhibits different transport regimes and spectral properties under different bias conditions.
Article
Physics, Fluids & Plasmas
Tianqi Chen, Dario Poletti
Summary: The study examines a harmonic oscillator under periodic driving and coupled to two harmonic-oscillator heat baths at different temperatures. By tuning parameters, the system can be transformed from an engine to an accelerator or even to a heater. Through studying the unitary evolution of the system and baths, steady correlations between the system and baths, as well as correlations between the baths, can be evaluated.
Article
Materials Science, Multidisciplinary
Vinitha Balachandran, Giuliano Benenti, Giulio Casati, Dario Poletti
Summary: When a quantum system has local conserved quantities, out-of-time-ordered correlators typically relax in an algebraic manner, assuming that the dynamics are local and the system follows the eigenstate thermalization hypothesis. This result depends on the algebraic scaling of OTOCs' infinite-time value with system size, typical in thermalizing systems with local conserved quantities, and on the presence of finite speed of propagation of correlations for finite-range-interaction systems. The conditions (i) and (ii) can also occur in time-dependent systems, both periodic or aperiodic, indicating that time independence of the Hamiltonian is not necessary.
Article
Physics, Fluids & Plasmas
Kang Hao Lee, Vinitha Balachandran, Dario Poletti
Summary: The study demonstrates that giant rectification can still be achieved in segmented chains even when each half chain is interacting, if the two interacting half chains are sufficiently different, possibly due to the emergence of an energy gap. In the thermodynamic limit, perfect rectification does not exist when each half chain is interacting.
Article
Physics, Fluids & Plasmas
Chu Guo, Dario Poletti
Summary: This work demonstrates how to extend automatic differentiation to complex loss functions, and applies it in solving quantum physics problems, providing practical value in efficiently computing gradients for neural networks.
