Review
Physics, Multidisciplinary
Shengjie Jin, Xuzong Chen, Xiaoji Zhou
Summary: This article reviews the methods for manipulating high orbital ultracold atoms in optical lattices and discusses the construction of atom-orbital qubits and the study of the dynamical evolution of high orbital atoms. These studies are of great significance for the application of ultracold atoms in optical lattices in various fields.
FRONTIERS IN PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Hao Qiao, Chang-Yue Sun, Cheng-Quan Peng, Qi-Chao Qi, Cheng-Cheng Zhao, Min Zhou, Xin-Ye Xu
Summary: In this experiment, the absolute frequencies and hyperfine splittings of ultracold 171Yb atoms in an optical lattice were determined. The frequencies were measured using a frequency comb referenced to an ultrastable optical cavity. The results showed higher linewidths than the natural linewidth due to probe and lattice light broadening. The measurements obtained were more accurate than previous measurements by one order of magnitude and also included the first measurements for certain transitions.
RESULTS IN PHYSICS
(2023)
Article
Physics, Multidisciplinary
Saeed Ghanbari
Summary: We introduce 3D permanent magnetic lattices for ultracold atoms and provide analytical expressions for the location of magnetic field minima and various physical quantities. The trap depths, modulation depths, and trap frequencies can be controlled by the bias field. Compared to optical lattices, the permanent magnetic lattices offer higher trap depths and trap frequencies, particularly between magnetic layers.
Review
Quantum Science & Technology
Shangguo Zhu, Yun Long, Wei Gou, Mingbo Pu, Xiangang Luo
Summary: Arrays of individual atoms trapped in optical microtraps offer a versatile platform for quantum sciences and technologies. By utilizing tunnel-coupled optical microtraps, researchers can explore exotic quantum states, phases, and dynamics that are challenging to achieve in conventional optical lattices.
ADVANCED QUANTUM TECHNOLOGIES
(2023)
Article
Physics, Multidisciplinary
Zhi-Cong Xu, Ziyu Zhou, Enhong Cheng, Li-Jun Lang, Shi-Liang Zhu
Summary: This study investigates the gain/loss effects on spin-orbit coupled ultracold atoms in two-dimensional optical lattices, revealing the interplay of non-Hermiticity and spin-orbit coupling. The researchers analytically obtain the topological phase diagram and develop a gauge-independent Wilson-loop method for numerically calculating the Chern number of multiple degenerate complex bands.
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
(2022)
Article
Physics, Multidisciplinary
Nilanjan Kundu, Ajay Nath, Jayanta Bera, Suranjana Ghosh, Utpal Roy
Summary: We provide a generic and precise analytical model for achieving negative absolute temperature in ultracold atoms under a quasi-periodic optical lattice and an expulsive trap. By controlling the trap parameters, we explore all the necessary conditions for achieving negative temperature domain and perform a quantitative estimation of the temperature in the negative domain. Numerical stability analysis confirms the stability of the proposed family of solutions and connects it to the merit of negative temperature through mean deviation data with varied trap parameters.
Article
Physics, Applied
Ryoto Takeuchi, Hayaki Chiba, Shoichi Okaba, Masao Takamoto, Shigenori Tsuji, Hidetoshi Katori
Summary: We have demonstrated the continuous outcoupling of ultracold Sr-88 atoms using a moving optical lattice. By optically pumping the atoms to the 5s5p P-3(0) state, we outcouple the atoms by a moving optical lattice. Such a continuous atomic source enables superradiant lasers and the zero-dead-time operation of atom interferometers and optical lattice clocks.
APPLIED PHYSICS EXPRESS
(2023)
Article
Physics, Multidisciplinary
C. A. Bracamontes, J. Maslek, J. Porto
Summary: We experimentally engineer a moatlike dispersion in a system of weakly interacting bosons. By periodically modulating the amplitude of a checkerboard optical lattice, we hybridize the two lowest isolated bands and observe a continuum of nearly degenerate minima that lie along a circle in reciprocal space. This moatlike dispersion has a direct effect on the trajectory of the center of mass position of the condensate, and the decay of the condensates is found to increase rapidly as the quasimomentum decreases below the minimum of the moat.
PHYSICAL REVIEW LETTERS
(2022)
Article
Multidisciplinary Sciences
Huan Yang, Xin-Yao Wang, Zhen Su, Jin Cao, De-Chao Zhang, Jun Rui, Bo Zhao, Chun-Li Bai, Jian-Wei Pan
Summary: The formation of triatomic molecules in mixtures of ultracold atoms and diatomic molecules using Feshbach resonance remains challenging. However, evidence of triatomic molecule association near the Feshbach resonance has been reported, and the binding energy of the triatomic molecules has been estimated.
Article
Optics
Vaibhav Sharma, Erich J. Mueller
Summary: The study introduces a set of driven-dissipative protocols for controlling cold atoms in tilted optical lattices and showcases how dissipation can manipulate quantum many-body systems. By employing a specific experimental setup, the research team successfully achieved controllable atom transport in the lattice and generation of self-healing quantum states.
Article
Optics
Dong Hu, Shengjie Jin, Zhongcheng Yu, Hongmian Shui, Yu Wang, Xiaoji Zhou
Summary: Manipulating quantum states with robustness is crucial for various quantum applications. This paper presents an improved shortcut design scheme that ensures exceptional robustness while maintaining high speed and high fidelity. Experimental verifications are conducted to demonstrate its effectiveness and application in quantum gate design.
Article
Instruments & Instrumentation
M. A. W. van Ninhuijs, K. A. Daamen, J. Beckers, O. J. Luiten
Summary: In this study, a resonant microwave cavity is presented as a new diagnostic tool for studying ultracold plasmas, utilizing the shift in resonance frequency to monitor the evolution of the plasma. By laser-cooling gas and creating an ultracold plasma inside the cavity, the diagnostic method is shown to be fast, sensitive, and non-destructive. The characterization of the cavity and the response time determination demonstrate the effectiveness of the cavity as a sensitive probe for studying ultracold plasmas.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2021)
Article
Optics
Dmitry Kouznetsov, Pol Van Dorpe, Niels Verellen
Summary: This paper catalogs known optical moire lattices and discovers exotic lattice configurations using a geometric analog of the Eratosthenes algorithm. Numerical simulations of time-of-flight interference patterns reveal the rich dynamics of Bose-Einstein condensates loaded into these optical lattices. The unique feature of this method is the ability to tune the periodicity of the lattices without changing the laser wavelength, while maintaining the local potential at each lattice site.
Article
Mathematics
Zhangjun Wang, Zili Chen
Summary: In this paper, the authors study the issue of unbounded convergence in Banach lattices and discuss the approximation property and continuity characterization of continuous operators. They also analyze the properties of order-weakly compact operators on Banach lattices.
Article
Physics, Applied
Oliver S. Burrow, Paul F. Osborn, Edward Boughton, Francesco Mirando, David P. Burt, Paul F. Griffin, Aidan S. Arnold, Erling Riis
Summary: Compact vacuum systems are essential for cold atom technologies, but existing systems can be large and require active pumping. This study presents a centiliter-scale ceramic vacuum chamber that enables robust laser cooling with minimal power consumption, showing promise for wide-ranging ultracold quantum metrology applications.
APPLIED PHYSICS LETTERS
(2021)
Article
Physics, Multidisciplinary
Nina del Ser, Lukas Heinen, Achim Rosch
Summary: In chiral magnets, a spatially homogeneous but oscillating magnetic field perpendicular to the propagation vector induces a net rotation of the texture around the vector, reminiscent of the motion of an Archimedean screw. This effect, proportional to the square of the field strength, can transport spin and charge, and can be resonantly enhanced by exciting internal modes of the helix. The helix can become unstable under stronger fields, forming a 'time quasicrystal' that oscillates in space and time.
Article
Physics, Multidisciplinary
Chen Qiu, Stephan Mandt, Maja Rudolph
Summary: The importance of deep probabilistic time series forecasting models is highlighted in the article, pointing out that existing generative models' inference models are often too limited, resulting in overly averaged dynamics in predictions. A variational dynamic mixtures (VDM) model is developed to address this issue by capturing multi-modality. Empirical studies show that VDM outperforms other methods in handling highly multi-modal datasets.
Article
Chemistry, Multidisciplinary
Mariia Stepanova, Jan Masell, Erik Lysne, Peggy Schoenherr, Laura Koehler, Michael Paulsen, Alireza Qaiumzadeh, Naoya Kanazawa, Achim Rosch, Yoshinori Tokura, Arne Brataas, Markus Garst, Dennis Meier
Summary: Research on magnetic disclinations, dislocations, and domain walls in FeGe reveals unique responses that distinguish them from the helimagnetic background, proposing a new detection scheme using superconducting microcoils for topological spin textures and domain walls in device-relevant geometries.
Article
Physics, Multidisciplinary
Alla Bezvershenko, Catalin-Mihai Halati, Ameneh Sheikhan, Corinna Kollath, Achim Rosch
Summary: In this study, we proposed an approach to describe the Dicke transition of interacting many-particle systems strongly coupled to the light of a lossy cavity. By combining a mean-field approach with a perturbative treatment of fluctuations, we were able to determine the nature of the steady state, the thermal character of the transition, and the universal properties of the emerging self-organized states. Our results were validated through comparisons with time-dependent matrix-product-state calculations.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
Anne Matthies, Jinhong Park, Erez Berg, Achim Rosch
Summary: Investigated two Josephson-coupled topological quantum wires with Coulomb interactions, inducing Floquet Majorana modes through oscillating gate voltage, enabling encoding of three qubits in a sector with fixed electron parity. Avoided system instability by gradually increasing oscillation frequency.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Yongjian Wang, Henry F. Legg, Thomas Boemerich, Jinhong Park, Sebastian Biesenkamp, A. A. Taskin, Markus Braden, Achim Rosch, Yoichi Ando
Summary: Researchers have discovered that ZrTe5 crystals exhibit a gigantic magnetochiral anisotropy when they are in proximity to a topological quantum phase transition, which is the largest ever observed. The low carrier density, inhomogeneities, and torus-shaped Fermi surface induced by breaking of inversion symmetry in a Dirac material are argued to be central to explaining this extraordinary property.
PHYSICAL REVIEW LETTERS
(2022)
Article
Multidisciplinary Sciences
Jessica N. Howard, Stephan Mandt, Daniel Whiteson, Yibo Yang
Summary: In many scientific fields, simulations are used to bridge the gap between theoretical models and experimental data. However, the transformation from theoretical models to experimental data is often poorly described analytically due to the reconstruction of experimental data from indirect measurements. To address this issue, we propose OTUS, a fast simulator based on unsupervised machine-learning, which can predict experimental data directly from theoretical models. OTUS trains a probabilistic autoencoder to transform between theoretical models and experimental data, and has the potential to replace current computationally-costly simulators.
SCIENTIFIC REPORTS
(2022)
Article
Physics, Multidisciplinary
Aprem P. Joy, Achim Rosch
Summary: This paper explores the behavior of visons in perturbed Kitaev spin liquid, revealing different phenomena in ferromagnetic and antiferromagnetic models, and discusses the universal signatures of vison diffusion in quench experiments.
Article
Physics, Multidisciplinary
Phoebe Tengdin, Benoit Truc, Alexey Sapozhnik, Lingyao Kong, Nina del Ser, Simone Gargiulo, Ivan Madan, Thomas Schoenenberger, Priya R. Baral, Ping Che, Arnaud Magrez, Dirk Grundler, Henrik M. Ronnow, Thomas Lagrange, Jiadong Zang, Achim Rosch, Fabrizio Carbone
Summary: The rotation of a skyrmion crystal can be controlled by a faster method, which is achieved through magnetic oscillations triggered by laser pulses. This method has potential applications in the engineering of spin-based logical devices.
Article
Materials Science, Multidisciplinary
Jeyong Park, Lasse Gresista, Simon Trebst, Achim Rosch, Jinhong Park
Summary: Moire systems provide a highly tunable platform for engineering band structures and exotic correlated phases. A theoretical study of a single layer of graphene subject to a smooth moire electrostatic potential is conducted, and it is found that ultra-flat bands coexist with a triangular network of chiral one-dimensional channels. Effective interactions between localized modes with multiple degrees of freedom emerge from the flat bands, and the form of these interactions reflects the chirality and one-dimensional nature of the network. The study focuses on commensurate order stabilized by local two-site and chiral three-site interactions and explores the effects of quantum and classical fluctuations on the observed phases.
Article
Physics, Multidisciplinary
Ruihan Yang, Prakhar Srivastava, Stephan Mandt
Summary: Denoising diffusion probabilistic models are a promising new class of generative models that demonstrate high-quality image generation. This paper presents an autoregressive, end-to-end optimized video diffusion model that surpasses previous methods in perceptual and probabilistic forecasting metrics. Results show significant improvements in perceptual quality and probabilistic frame forecasting ability for various datasets.
Article
Physics, Multidisciplinary
Camiel van Efferen, Jeison Fischer, Theo A. Costi, Achim Rosch, Thomas Michely, Wouter Jolie
Summary: In this study, a Kondo system based on a quantum confined state within a MoS2 grain boundary is described. The system allows for experimental resolution of the spectral function and its spatial modulation, as well as testing the predictive power of the Anderson model in Kondo physics.
Proceedings Paper
Computer Science, Artificial Intelligence
Antonios Alexos, Alex Boyd, Stephan Mandt
Summary: Researchers propose a new non-parametric variational inference scheme that combines ideas from SGMCMC and coordinate-ascent VI, aiming to relax the assumptions on the posterior distribution. They introduce a new Langevin-type algorithm that operates on a self-averaged posterior energy function to break the statistical dependencies between coordinates, allowing for faster mixing. The scheme is tested on various tasks and shows improvements in convergence speed and/or final accuracy compared to SGMCMC and parametric VI.
INTERNATIONAL CONFERENCE ON MACHINE LEARNING, VOL 162
(2022)
Article
Materials Science, Multidisciplinary
Jinhong Park, Omri Golan, Yuval Vinkler-Aviv, Achim Rosch
Summary: This study investigates the response of quantum Hall states and other gapped chiral topological states to temperature gradients. The traditional approach of using a gravitational model to describe temperature gradients is found to be invalid for these states.
Article
Chemistry, Multidisciplinary
Fabian Jirasek, Robert Bamler, Sophie Fellenz, Michael Bortz, Marius Kloft, Stephan Mandt, Hans Hasse
Summary: This study combines machine learning and classical thermodynamic models to predict the thermodynamic properties of mixtures. By embedding machine learning methods into classical models, the predictive accuracy is significantly improved, and a complete set of parameters for all binary systems is obtained.
