Article
Multidisciplinary Sciences
Seung-Hwan Do, Hao Zhang, Travis J. Williams, Tao Hong, V. Ovidiu Garlea, J. A. Rodriguez-Rivera, Tae-Hwan Jang, Sang-Wook Cheong, Jae-Hoon Park, Cristian D. Batista, Andrew D. Christianson
Summary: The study explores the collective quantum effects in quantum materials by investigating the interacting transverse and longitudinal modes in an easy-plane quantum magnet. The experimental and theoretical analysis demonstrates the emergence, decay, and renormalization of a longitudinal mode, with decay being more pronounced at the zone center. The theoretical framework developed here is broadly applicable to anisotropic spin quantum magnets with multiple low energy modes.
NATURE COMMUNICATIONS
(2021)
Article
Materials Science, Multidisciplinary
Gao-Qi An, Yan-Hua Zhou, Tao Wang, Xue-Feng Zhang
Summary: The study investigates the behavior of a two-dimensional array of Rydberg atoms in an optical cavity using variational methods and large-scale quantum Monte Carlo simulations. The results show that the strong dipole-dipole interactions between the atoms can lead to a crystal structure, and the coupling between a two-level atom and a cavity photon mode leads to the formation of polaritons. The interplay between these interactions results in a rich quantum phase diagram. This research provides guidance for future experiments.
Article
Chemistry, Physical
Mauro Sellitto
Summary: The phase behavior of a Biroli-Mezard model on a two-dimensional square lattice was studied using Monte Carlo simulations. It was found that a first-order phase transition occurs at high density, leading to the formation of a crystal phase with enantiomorph ground state configurations.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Multidisciplinary Sciences
Cheng Chen, Guillaume Bornet, Marcus Bintz, Gabriel Emperauger, Lucas Leclerc, Vincent S. Liu, Pascal Scholl, Daniel Barredo, Johannes Hauschild, Shubhayu Chatterjee, Michael Schuler, Andreas M. Laeuchli, Michael P. Zaletel, Thierry Lahaye, Norman Y. Yao, Antoine Browaeys
Summary: Spontaneous symmetry breaking is the basis of classifying phases of matter and their transitions, and continuous symmetry breaking leads to the emergence of gapless Goldstone modes that control the thermodynamic stability of the ordered phase. In this study, a two-dimensional dipolar XY model is realized using a programmable Rydberg quantum simulator, and the presence of long-range XY order is characterized. This work complements recent studies on Ising-type interactions showing discrete spin rotation symmetry using the Rydberg-blockade mechanism.
Article
Mathematics, Applied
Serena Dipierro, Giorgio Poggesi, Enrico Valdinoci
Summary: This study provides a quantitative estimate of the angular function of equilibria in a Frenkel-Kontorova system of harmonic oscillators in a two-dimensional Euclidean lattice. The proof involves a PDE method related to a conjecture by E. De Giorgi and a technique based on complex variables introduced by A. Farina. Careful analysis of the reminders in the discrete setting is necessary to apply these methodologies inspired by continuum models.
PHYSICA D-NONLINEAR PHENOMENA
(2021)
Article
Materials Science, Multidisciplinary
I. Andreev, V. M. Muravev, N. D. Semenov, A. A. Zabolotnykh, I. Kukushkin
Summary: The spectrum of two-dimensional plasmon polaritons over the full range of magnetic fields was investigated, with a focus on their hybridization with the TM0 photonic mode of a dielectric waveguide. A theory for plasmon-polaritons in an infinite 2DES was developed and found to be in good agreement with experimental data.
Article
Mathematics, Interdisciplinary Applications
Zeyun Shi, Fazal Badshah, Lu Qin
Summary: This study proposes a method to achieve two-dimensional optical lattices and nonlocal giant Kerr nonlinearity using Rydberg-dressed atomic gas under the condition of electromagnetically induced transparency (EIT). Stable 2D bright lattice solitons and extended optical pattern formations are obtained by balancing diffraction, negative effective mass, and nonlocal self-defocusing Kerr nonlinearity. The results provide a versatile control route for laser patterns and solitons, with potential applications in optical communications and information processing.
CHAOS SOLITONS & FRACTALS
(2023)
Article
Materials Science, Multidisciplinary
Wei Xin Teo, Weiwei Zhu, Jiangbin Gong
Summary: Two-dimensional laser arrays can be achieved at a large scale by utilizing higher-order topological insulator physics and the non-Hermitian skin effect. By tuning the system parameters appropriately and pumping at a single site, a stable topologically protected lasing mode delocalized across two dimensions can be obtained. Coupled optical ring resonators are proposed as a promising platform for realizing large-scale two-dimensional laser arrays.
Article
Materials Science, Multidisciplinary
A. M. Zarezin, V. M. Muravev, P. A. Gusikhin, A. A. Zabolotnykh, V. A. Volkov, I. Kukushkin
Summary: We investigated the microwave response of a gated two-dimensional electron system loaded by an external on-chip resonator. We found that the system response was dominated by the excitation of relativistic plasmons, which exhibited anomalously strong coupling to the photon mode of the resonator. This strong coupling resulted in a drastic reduction of the plasma resonant frequency and linewidth. We developed an analytical approach that explained the observed phenomenon and found good agreement with the experiment.
Article
Materials Science, Multidisciplinary
L. Desplat, S. Meyer, J. Bouaziz, P. M. Buhl, S. Lounis, B. Dupe, P. -A. Hervieux
Summary: This research demonstrates the generation of Dzyaloshinskii-Moriya interaction in ultrathin metal film from a femtosecond pulse in electric field, achieving magnetoelectric coupling. Through calculations and simulations, it is shown that this phenomenon does not require structural inversion-symmetry breaking and can be achieved in a very short timescale.
Article
Physics, Fluids & Plasmas
Y. Huang, W. Li, C. Reichhardt, C. J. O. Reichhardt, Yan Feng
Summary: The phonon spectra of a 2D solid dusty plasma modulated by square and triangular periodic substrates show that wave propagation is suppressed due to confinement of particles. Different commensurability ratios lead to different vibrational characteristics, with a commensurability ratio of 1 resulting in particles oscillating at a specific frequency and a ratio of 2 allowing for more complex vibrational modes. The differences in spectra between square and triangular substrates are attributed to substrate anisotropy and alignment directions of the particles within potential wells.
Article
Materials Science, Multidisciplinary
Peigeng Zhong, Tao Wang, Shijie Hu, Haiqing Li
Summary: In this study, density-dependent hoppings of two-species hardcore bosons in a one-dimensional optical lattice were investigated, focusing on the effects in the first resonance region. The system undergoes a phase transition and exhibits a state that breaks the translation symmetry. The level spectroscopic technique was used to obtain precise transition lines, and other physical properties were also examined.
Article
Engineering, Chemical
Alexander Tarasenko
Summary: This study investigates the diffusion process in a binary mixture of species coadsorbed on a multisite square lattice. The diffusion equations are derived to describe the evolution of small hydrodynamic fluctuations of the molecule coverages. The Fickian diffusivities and Onsager phenomenological coefficients are expressed in analytical expressions, revealing the diffusion behavior in this complex system.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Wei Zhang, Changchun Chai, Qingyang Fan, Yintang Yang, Minglei Sun, Maurizia Palummo, Udo Schwingenschlogl
Summary: We have designed two-dimensional borocarbonitrides (poly-butadiene-cyclooctatetraene framework BC2N) with stable hexagonal unit cells. These materials are n-type semiconductors with strain-tunable direct band gaps, high electron mobility, and strong absorption. They show great potential for photocatalytic hydrogen production and can be used in high-efficiency solar cells based on type-II heterostructures with transition metal dichalcogenides.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Review
Physics, Multidisciplinary
Fangli Liu, Zhi-Cheng Yang, Przemyslaw Bienias, Thomas Iadecola, Alexey Gorshkov
Summary: This study investigates the effect of positional disorder on Rydberg atoms trapped in a 2D square lattice and uncovers three different regimes, which are absent in other systems. The use of quench dynamics is proposed for experimental probing of these regimes.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Markus Stecker, Raphael Nold, Lea-Marina Steinert, Jens Grimmel, David Petrosyan, Jozsef Fortagh, Andreas Guenther
PHYSICAL REVIEW LETTERS
(2020)
Article
Quantum Science & Technology
Arpad Kurko, Peter Domokos, Andras Vukics, Thomas Baekkegaard, Nikolaj Thomas Zinner, Jozsef Fortagh, David Petrosyan
Summary: In this study, we investigate the emission of photons from a coherently prepared atomic ensemble in an elongated harmonic trap with normal density distribution. By determining the parameters of paraxial optics, we match the mode geometry of the emitted radiation and collect it optimally into an optical waveguide.
EPJ QUANTUM TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Panayotis A. Kalozoumis, David Petrosyan
Summary: The study shows that a semiconductor exciton-polariton condensate in a double-well potential, after being pumped by above-threshold laser, forms a self-organized PT-symmetric phase.
APPLIED SCIENCES-BASEL
(2021)
Article
Physics, Multidisciplinary
Nikolaos E. Palaiodimopoulos, Maximilian Kiefer-Emmanouilidis, Gershon Kurizki, David Petrosyan
Summary: We investigate the transmission of spin excitation through spin chains with long-range exchange interactions in the presence of diagonal and off-diagonal disorder. By determining the mean localization length of single-excitation eigenstates, we identify energy eigenstates suitable for transferring excitation between the sender and receiver spins connected to opposite ends of the chain. We examine the performance of two transfer schemes involving weak static couplings and time-dependent couplings, and find that the latter, which utilizes stimulated adiabatic passage, shows improved performance.
SCIPOST PHYSICS CORE
(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
Optics
A. F. Tzortzakakis, A. Katsaris, N. E. Palaiodimopoulos, P. A. Kalozoumis, G. Theocharis, K. Diakonos, D. Petrosyan
Summary: We study the non-Hermitian, parity-time-symmetric extensions of the one-dimensional Su-Schrieffer-Heeger model in the topological nontrivial configuration. We investigate the properties of the topologically protected edge states and develop an effective analytical description that accurately predicts the PT-symmetry-breaking point for these edge states. Our analytical results are verified through exact numerical calculations.
Article
Optics
Arpad Kurko, Peter Domokos, David Petrosyan, Andras Vukics
Summary: Stimulated Raman scattering on A atoms is explored to generate optical photons in a microwave excitation. By coupling an atomic Bose-Einstein condensate to a microwave field, the photons can be scattered into the guided modes of a nearby optical fiber. The study investigates the possibility of using momentum transfer to separate the converted photons from the Raman readout pulse, as well as achieving superradiant scattering for increased collection efficiency in the fiber's guided modes.
Article
Optics
Armen E. Allahverdyan, David Petrosyan
Summary: This paper investigates the search problem in an unstructured database and introduces the Grover algorithm for quantum search. By reformulating the search problem as a Markov process, the authors find that the desired element can be found in a shorter time.
Article
Physics, Multidisciplinary
Manuel Kaiser, Conny Glaser, Li Yuan Ley, Jens Grimmel, Helge Hattermann, Daniel Bothner, Dieter Koelle, Reinhold Kleiner, David Petrosyan, Andreas Guenther, Jozsef Fortagh
Summary: Hybrid quantum systems involving cold atoms and microwave resonators can enable cavity-mediated infinite-range interactions between atomic spin systems and realize atomic quantum memories and transducers for microwave-to-optical conversion. In this experiment, the researchers achieved coherent coupling of a Rydberg transition of ultracold atoms, trapped on an integrated superconducting atom chip, to the microwave field of an on-chip coplanar waveguide resonator. This study demonstrates the feasibility of coherent-state manipulation of Rydberg atoms interacting with superconducting circuits, paving the way for realization of capable hybrid quantum systems.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Materials Science, Multidisciplinary
K. Orfanakis, A. F. Tzortzakakis, D. Petrosyan, P. G. Savvidis, H. Ohadi
Summary: Researchers observed temporal coherence beyond 1 ns in an optically trapped exciton-polariton condensate, with coherence time more than an order of magnitude longer than an untrapped condensate. This ultralong coherence allows for high-precision spectroscopy of the trapped condensate, where periodic beats of the field correlation function were observed due to fine energy splitting of two polarization modes of the condensate, emphasizing the importance for polariton simulators with spinor condensates in lattice potentials.
Article
Multidisciplinary Sciences
Armen E. Allahverdyan, Karen Hovhannisyan, David Petrosyan
Summary: This proposal presents a dynamical model for the state symmetrization of two identical particles produced by independent sources in spacelike-separated events. The model suggests that initially distinguishable particles become indistinguishable as they collide, leading to a symmetrized state. The probability density of collision times can be estimated using quasi-classical methods or fully quantum mechanical considerations.
PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2021)
Article
Optics
David Petrosyan, Klaus Molmer
Summary: The study focuses on the collective radiation properties of cold, trapped ensembles of atoms in the high-density regime, finding a strong enhancement in photon emission rate in elongated atomic clouds. The absorption-emission spectrum is broadened and shifted to lower frequencies compared to noninteracting or single-atom spectrum, and analysis is done on the spatial and temporal profiles of emitted radiation. Additionally, exploration is conducted on efficiently exciting collective superradiant states of the atomic ensemble from a long-lived storage state for matter-light interfaces in quantum computation and communication applications.
Article
Physics, Multidisciplinary
P. A. Kalozoumis, G. M. Nikolopoulos, D. Petrosyan
Article
Physics, Multidisciplinary
K. S. Christensen, S. E. Rasmussen, D. Petrosyan, N. T. Zinner
PHYSICAL REVIEW RESEARCH
(2020)
