Article
Physics, Multidisciplinary
Yafen Cai, Shuai Shi, Yijia Zhou, Jianhao Yu, Yali Tian, Yitong Li, Kuan Zhang, Chenhao Du, Weibin Li, Lin Li
Summary: This study demonstrates a novel atom-based microwave field amplitude stabilizer using microwave-dressed Rydberg atoms, which features multi-band frequency tunability and large stabilization bandwidth. The stabilization bandwidth achieved is two orders of magnitude higher than previous methods and can potentially be further increased. This research paves the way for developing noise-resilient, miniaturized, sensitive, and broadband electric field control and applications.
FRONTIERS OF PHYSICS
(2023)
Article
Optics
Maitreyi Jayaseelan, Andrew P. Rotunno, Nikunjkumar Prajapati, Samuel Berweger, Alexandra B. Artusio-Glimpse, Matthew T. Simons, Christopher L. Holloway
Summary: In this study, we experimentally demonstrate and theoretically model various nonlinear and multiphoton phenomena in the atomic response of Rydberg atoms driven by near-resonant dual-tone radio-frequency (rf) fields under strong driving conditions. Our findings validate previous two-state models and highlight the complexity and unique excitation pathways of the rf-driven Rydberg system.
Article
Materials Science, Multidisciplinary
Pierre Fromholz, Mikheil Tsitsishvili, Matteo Votto, Marcello Dalmonte, Alexander Nersesyan, Titas Chanda
Summary: Dressed Rydberg atoms in optical lattices offer a promising platform for quantum simulation of intriguing phenomena in strongly interacting systems. This study investigates the phase diagram of hard-core bosons in a triangular ladder, revealing transitions between different phases.
Article
Materials Science, Multidisciplinary
Yu-Xi Xu, Yuan Zhao, Qi-Hong Huang, De-Wei Wang, Zhuo Fan, Li Xue, Si-Liu Xu
Summary: The researchers theoretically investigated the localization of nonlinear matter waves in the PT-symmetric Rydberg atomic BECs system, finding that they can be generated and maintained with stability. Fundamental, higher-order, and vortical solitons were discovered, and their stability was evaluated through numerical simulation and linear-stability analysis. Additionally, the collision of solitons showed a quasi-elastic feature.
RESULTS IN PHYSICS
(2023)
Article
Optics
Junhyun Lee, Pavel A. Volkov, B. J. DeSalvo, J. H. Pixley
Summary: We theoretically investigate the emergent phases of strongly correlated spin-21 Fermi gases of Rydberg-dressed atoms in a one-dimensional optical lattice. At weak coupling, a bosonization description is used to demonstrate the ability to drive alternating quantum phase transitions between distinct Luttinger liquids. At strong coupling, the ground state exhibits nontrivial phase separation, with Luttinger liquid puddles separated by magnetic domain walls, due to the interplay of the incommensurate filling and the Rydberg core length scale. These phases can be detected in ultracold gases of Rydberg atoms made from 6Li.
Article
Optics
Yucheng He, Jing-Xin Liu, F-Q Guo, L-L Yan, Ronghui Luo, Erjun Liang, S-L Su, M. Feng
Summary: The scheme proposed in this study combines Vitanov-style pulses and dressed-state-based shortcut to adiabaticity (STA) to achieve multiple-qubit quantum state transfer and quantum logic gate in Rydberg atoms. By using STA technology to reduce the population of Rydberg excited states, the scheme demonstrates robustness to spontaneous emission, while well-designed pulses help minimize control errors. The dressed-state method applied in the scheme allows for smoother quantum state transfer operations with high fidelity, and is faster than traditional shortcut to adiabaticity methods.
OPTICS COMMUNICATIONS
(2022)
Article
Optics
Yuxi Chen, Zhengyang Bai, Chao Hang, Guoxiang Huang
Summary: A scheme to generate nonlocal optical Kerr nonlinearity and polaritonic solitons via matter-wave superradiance in a Rydberg-dressed Bose-Einstein condensate (BEC) is presented. The scattered field polariton spectrum is significantly changed due to the long-range Rydberg-Rydberg interaction between atoms, taking a roton-maxon form. The BEC structure factor also exhibits a strong dependence on Rydberg-dressing, which can be controllably tuned.
Article
Optics
Yunhui He, Zhengyang Bai, Yuechun Jiao, Jianming Zhao, Weibin Li
Summary: In this study, steady-state phases of a one-dimensional array of Rydberg atoms coupled by a microwave field were investigated. The interplay among the microwave coupling, van der Waals interaction, and single-body and collective decay between Rydberg states was examined. Different phases, including uniform, antiferromagnetic, oscillatory, bistable, and multistable phases, were observed. Numerical simulations and linear stability analysis were performed to investigate the critical point and scaling of the phase transition with the atom number.
Article
Optics
Jinpeng Yuan, Ting Jin, Lirong Wang, Liantuan Xiao, Suotang Jia
Summary: A mechanism for improving the sensitivity of microwave electric field measurement is presented using dual-MW-dressed electromagnetically induced transparency in a Rb-85 atomic coherent system. By introducing an auxiliary MW field and adjusting its frequency and power, the sensitivity of MW E-field measurement is improved by about two orders of magnitude. This mechanism is applicable for all frequency bands covered by Rydberg energy levels and opens up a novel pathway for high-sensitivity MW E-field measurement with Rydberg atoms.
LASER PHYSICS LETTERS
(2022)
Article
Materials Science, Multidisciplinary
T. Kwapinski
Summary: This study investigates a phase of solid state matter existing in the time dimension on a linear chain of quantum dots or atomic sites using the evolution operator technique and the Laplace transform technique. The focus is on the spectral density of states (DOS) function and its modifications after a sudden change in the system. The results show that this function exhibits a regular oscillating structure in time, corresponding to the stationary DOS of one-dimensional crystals. Therefore, this system represents a transient crystal material that exists in the time dimension for a short period and then suddenly disappears. Additionally, different impulse propagation velocities are observed due to the local DOS inertia, making it more difficult to rebuild a multi-peaked DOS structure associated with longer chains. Furthermore, the transient crystal pattern in a linear chain can be observed in real electrodes characterized by van Hove singularities or a flat spectral density.
Article
Chemistry, Physical
Haruki Sato, Syed A. Abd Rahman, Yota Yamada, Hiroyuki Ishii, Hiroyuki Yoshida
Summary: The authors employed angle-resolved low-energy inverse photoelectron spectroscopy to reveal the LUMO band structure of pentacene and proposed an improved polaron model to explain the phenomenon of bandwidth reduction. The results demonstrate that electron mobility in high-mobility organic semiconductors is limited by polaron formation.
Article
Optics
Travis Frazer, Katharina Gillen
Summary: In this work, a one-dimensional optical dipole trap array is computationally investigated to reduce light scattering and enable neutral atom quantum computing. The system shows similar trap properties to the traditional red-detuned case but with lower laser power. It also offers versatility and the ability to reduce light scattering.
APPLIED PHYSICS B-LASERS AND OPTICS
(2022)
Article
Multidisciplinary Sciences
Yuan Zhao, Heng-Jie Hu, Qian-Qian Zhou, Zhang-Cai Qiu, Li Xue, Si-Liu Xu, Qin Zhou, Boris A. Malomed
Summary: Numerical results show that the interplay of spin-orbit coupling and Rydberg interactions can stabilize 3D solitons, improving their resistance to collapse. The stability range depends on the strengths of spin-orbit coupling, Rydberg interactions, and the soft-core atomic radius.
SCIENTIFIC REPORTS
(2023)
Article
Multidisciplinary Sciences
Jiawei Zhang, Nikolaj Roth, Kasper Tolborg, Seiya Takahashi, Lirong Song, Martin Bondesgaard, Eiji Nishibori, Bo B. Iversen
Summary: Disordered, diffusive atoms are rarely found in simple crystalline solids. Here, the authors observe a one-dimensional disordered diffusion channel in a simple chain-like thermoelectric InTe with ultralow thermal conductivity, which undergoes a static-dynamic transition with increasing temperature. This phenomenon provides insight into the mechanism behind ultra-low thermal conductivity in chain-like materials.
NATURE COMMUNICATIONS
(2021)
Article
Optics
Feng-Dong Jia, Xiu-Bin Liu, Jiong Mei, Yong-Hong Yu, Huai-Yu Zhang, Zhao-Qing Lin, Hai-Yue Dong, Jian Zhang, Feng Xie, Zhi-Ping Zhong
Summary: The study introduces a method using auxiliary microwave-dressed Rydberg atoms to extend the measurement range of microwave electric field strength from several mV/cm to μV/cm. This method can improve the accuracy and sensitivity of microwave electrometry.
Article
Physics, Multidisciplinary
Maximilian Kiefer-Emmanouilidis, Razmik Unanyan, Michael Fleischhauer, Jesko Sirker
Summary: We study quench dynamics in a t-V chain of spinless fermions with strong potential disorder and argue particles do not become fully localized, with no alternative interpretations found. Further insights into entanglement dynamics and particle fluctuations are obtained by comparing with noninteracting systems. Renormalized bounds in the interacting case support numerically discovered scaling relations between number and entanglement entropies.
Article
Physics, Multidisciplinary
Alexander Altland, Michael Fleischhauer, Sebastian Diehl
Summary: This study presents a complete symmetry classification of fermion matter in and out of thermal equilibrium, starting from the state transformations in fermionic Fock spaces and the invariance properties of the density matrix dynamical equation. The classification of generators of reversible dynamics, dissipation, and fluctuations in irreversible and interacting dynamical equations leads to a distinction between equilibrium and out-of-equilibrium symmetries, highlighting the role of time in each case. In the context of nonequilibrium quantum dynamics, a novel realization of antilinear symmetries is observed, fundamentally different from the rules of thermal equilibrium.
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
Simon Ohler, Maximilian Kiefer-Emmanouilidis, Antoine Browaeys, Hans Peter Buechler, Michael Fleischhauer
Summary: Investigation of properties in a one-dimensional zig-zag ladder system of spin-orbit coupled Rydberg atoms reveals an association between second-order hopping and effective gauge field, leading to the formation of current vortices.
NEW JOURNAL OF PHYSICS
(2022)
Article
Physics, Multidisciplinary
C. D. Mink, A. Pelster, J. Benary, H. Ott, M. Fleischhauer
Summary: The truncated Wigner approximation is a method for describing the dynamics of weakly interacting Bose gases. In this paper, a numerically inexpensive scheme is developed by approximating the c-number field, and its accuracy and efficiency are demonstrated by comparing predictions to experimental data.
Article
Physics, Multidisciplinary
Maximilian Kiefer-Emmanouilidis, Razmik Unanyan, Michael Fleischhauer, Jesko Sirker
Summary: In this study, we investigate and compare the particle number fluctuations in a spinless fermion model with potential disorder and nearest-neighbor interactions in the putative many-body localized (MBL) phase with those in the non-interacting case (Anderson localization) and in effective models where only interaction terms diagonal in the Anderson basis are kept. We demonstrate that these simple effective models cannot explain the particle number fluctuations observed in the MBL phase of the microscopic model.
Article
Physics, Multidisciplinary
Benjamin Nagler, Martin Will, Silvia Hiebel, Sian Barbosa, Jennifer Koch, Michael Fleischhauer, Artur Widera
Summary: We experimentally study the dissipative dynamics of ultracold bosonic gases in a dynamic disorder potential with tunable correlation time. Our results reveal the interplay between superfluidity and time-dependent disorder and establish ultracold atoms as a platform for studying spatiotemporal noise and time-dependent disorder.
PHYSICAL REVIEW LETTERS
(2022)
Article
Optics
R. G. Unanyan, N. V. Vitanov, M. Fleischhauer
Summary: The Born-Fock theorem is a fundamental theorem in quantum mechanics that provides the basis for reliable and efficient navigation in the Hilbert space of a quantum system with a time-dependent Hamiltonian through adiabatic evolution. By controlling the eigenstates and their energetic order, perfect adiabatic transfer between initial and target states can be achieved. The fidelity of the state transfer is limited by adiabaticity, and the selection of target states is controlled by the integer invariant labeling the order of eigenstates. In this study, we demonstrate the adiabatic control of eigenstates in a finite superlattice Wannier-Stark ladder, resulting in perfectly quantized single-particle transport across a predetermined number of lattice sites. We dedicate this paper to the memory of our late friend and colleague Bruce Shore, who was an expert in adiabatic processes and greatly influenced our understanding in this field.
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS
(2023)
Article
Physics, Multidisciplinary
Helene Wetter, Michael Fleischhauer, Stefan Linden, Julian Schmitt
Summary: This paper studies the dissipation-induced emergence of a topological band structure in a non-Hermitian one-dimensional lattice system using arrays of plasmonic waveguides with tailored loss, and provides direct evidence for a topological edge state residing in the center of the band gap.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Multidisciplinary
Simon Ohler, Maximilian Kiefer-Emmanouilidis, Michael Fleischhauer
Summary: We investigate the nonlinear transport of bosonic excitations in a two-dimensional honeycomb lattice of spin-orbit-coupled Rydberg atoms, and find that it gives rise to topological disordered quantum phases. By using exact diagonalization (ED), we study the competition between density-dependent and direct transport terms as well as density-density interactions, and numerically determine the resulting phase diagram. We show the emergence of a new phase with large spin chirality and nontrivial many-body Chern number induced by the density dependence of the complex hopping.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Physics, Multidisciplinary
Christopher D. Mink, David Petrosyan, Michael Fleischhauer
Summary: In this study, we propose a systematic approach for the semiclassical treatment of many-body dynamics of interacting, open spin systems. This approach improves the classical treatment by accounting for lowest-order quantum fluctuations and overcomes some of the limitations of the existing discrete truncated Wigner approximation. By embedding the discrete truncated Wigner approximation in a continuous phase space, we derive an exact equation of motion for the continuous SU(2) Wigner function of spins. By neglecting specific terms in this exact equation of motion, we recover the standard discrete truncated Wigner approximation. This hybrid approach allows us to determine validity conditions and gain a detailed understanding of the approximation quality, paving the way for systematic improvements. We also demonstrate that the continuous embedding allows for an extension of the method to open spin systems subject to dephasing, losses, and incoherent drive.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Optics
Andreas F. Tzortzakakis, David Petrosyan, Michael Fleischhauer, Klaus Molmer
Summary: This study examines the adiabatic preparation of spatially ordered Rydberg excitations of atoms in finite one-dimensional lattices. It aims to unravel the microscopic mechanism of the phase transition and estimate the preparation fidelity of the target state. The study shows that the many-body system can be described as an effective two-level system and the final preparation fidelity can be approximated using the Landau-Zener formula.
Article
Materials Science, Multidisciplinary
Lukas Wawer, Michael Fleischhauer
Summary: The topological classification of fermion systems in mixed states has been a long-standing quest. Observable many-body correlators in mixed states preserve the quantized nature and naturally connect to known topological invariants in the ground state. A Z(2) topological invariant has been proposed for systems with time-reversal symmetry, which is identical to well-known Z(2) invariants for the ground state.
Article
Materials Science, Multidisciplinary
Lukas Wawer, Michael Fleischhauer
Summary: The study extends the concept of ensemble geometric phase to mixed states in two-dimensional band structures, introducing a proper Chern number calculation method for various types of states. The Chern number can be calculated through the ground-state Berry curvature of a fictitious Hamiltonian that breaks time-reversal symmetry.
Article
Optics
Lukas Wawer, Rui Li, Michael Fleischhauer
Summary: The study demonstrates that a topological pump in a one-dimensional insulator can cause strictly quantized transport in an auxiliary chain of noninteracting fermions, with the transported charge determined by an integer topological invariant of the insulator's fictitious Hamiltonian. This number is identical to the TKNN invariant of the original system in the case of noninteracting fermions, while in interacting systems, the transported charge defines a topological invariant. In certain cases, this invariant agrees with the many-body generalization of the TKNN number.
