Article
Physics, Multidisciplinary
Kavish Bhardwaj, S. P. Ram, S. Singh, V. B. Tiwari, S. R. Mishra
Summary: This work investigates the effect of AC-Stark shift of atomic energy levels in an optical dipole trap on in situ absorption imaging of trapped atoms. The estimated number of atoms trapped in the ODT is found to be higher at higher ODT beam power, showing qualitative agreement with larger trap depth at higher beam power. This research can be particularly useful in estimating the in situ loss rate of atoms from the trap during evaporative cooling of the trapped atom cloud.
Article
Optics
Junnosuke Takai, Kosuke Shibata, Naota Sekiguchi, Takuya Hirano
Summary: We demonstrate the measurement of quadratic ac Stark shifts between Zeeman sublevels in an 87Rb Bose-Einstein condensate using a multistate atomic interferometer. The interferometer is able to detect the quadratic shift without being affected by relatively large state-independent shifts, thus improving the measurement precision. We measured the quadratic shifts in the total spin F = 2 state due to the light being near resonant to the D1 line. The agreement between the measured and theoretical detuning dependences of the quadratic shifts confirms the validity of the measurement. We also present results on the suppression of nonlinear spin evolution using near-resonant dual-color light pulses with opposite quadratic shifts.
Article
Physics, Applied
Qinfang Xu, Xiaotong Lu, Jingjing Xia, Yebing Wang, Hong Chang
Summary: This paper introduces a frequency modulation technique to measure the probe Stark shift of optical clocks accurately by controlling the effective coupling strength precisely. Experimental results show that with the help of frequency modulation, the probe light power can be increased significantly without decreasing the measurement precision, resulting in an improved measurement lever arm compared with previous results.
APPLIED PHYSICS LETTERS
(2021)
Article
Physics, Multidisciplinary
Javad Kazemi, Hendrik Weimer
Summary: This study theoretically analyzes the steady state of a van der Waals interacting Rydberg gas in an optical lattice, with a focus on the physics of the Rydberg blockade. The research finds that, under sufficiently strong dephasing, the steady state undergoes a first order phase transition from a blockaded Rydberg gas to a facilitation phase where the blockade is lifted. This transition terminates in a critical point, offering a promising route to investigate dissipative criticality in these systems.
PHYSICAL REVIEW LETTERS
(2023)
Article
Optics
S. Yusofsani, M. Kolesik
Summary: An approximation-free and numerically efficient algorithm is introduced for the calculation of Hamiltonian eigenstates in the Stark hydrogen problem, which describes a quantum particle subject to the central Coulomb force and a homogeneous external field. The algorithm is applied to calculate the time-dependent wave function of an electron tunneling from a hydrogen atom suddenly exposed to an external electric field, as an example.
Article
Physics, Multidisciplinary
D. Chetty, R. D. Glover, X. M. Tong, B. A. deHarak, H. Xu, N. Haram, K. Bartschat, A. J. Palmer, A. N. Luiten, P. S. Light, I. Litvinyuk, R. T. Sang
Summary: This joint experimental-theoretical study focuses on the carrier-envelope phase (CEP) of a few-cycle pulse and its effect on atomic excitation processes. The results confirm the theoretical predictions and suggest the use of tailored laser fields for coherent control of strong-field excitation. The study shows distinct CEP-dependent behavior for bound-state population at low and high intensities.
PHYSICAL REVIEW LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Sergei Gladyshev, Artem Shalev, Kristina Frizyuk, Konstantin Ladutenko, Andrey Bogdano
Summary: We develop a theory of bound states in the continuum (BICs) in multipolar lattices and predict their robustness to changes in lattice parameters. We also find that some multipolar lattices can host BICs forming a continuous line and carrying zero topological charge. The developed theory establishes a fundamental relation between the topological charge of BICs and the asymptotic behavior of the Q factor in its vicinity.
Article
Multidisciplinary Sciences
Shulin Wang, Chengzhi Qin, Weiwei Liu, Bing Wang, Feng Zhou, Han Ye, Lange Zhao, Jianji Dong, Xinliang Zhang, Stefano Longhi, Peixiang Lu
Summary: This study demonstrates higher-order dynamic localization of photons in a synthetic temporal mesh lattice and discusses the idea of tunable temporal cloaking by combining different-order localizations.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Jiaqi Zhao, Ya Bai, Zhenhua Li, Jinjia Liu, Wei Wang, Pu Wang, Bei Yang, Run Shi, Geoffrey I. N. Waterhouse, Xiao-Dong Wen, Qing Dai, Tierui Zhang
Summary: The activation of water molecules in thermal catalysis typically requires high temperatures, which poses a challenge for catalyst development in the low-temperature water-gas shift reaction (WGSR). Plasmonic photocatalysis provides a solution by activating water at low temperatures through the generation of light-induced hot electrons. In this study, a layered double hydroxide-derived copper catalyst (LD-Cu) was developed for efficient low-temperature photo-driven WGSR.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Materials Science, Multidisciplinary
Stefano Longhi
Summary: In this article, an exact spectral analysis of the mosaic Wannier-Stark Hamiltonian is presented to prove that there are no mobility edges separating extended and localized states in disorder-free one-dimensional models. The energy spectrum is shown to be almost pure point, with all wave functions exhibiting localization higher than exponential, except for (M - 1) isolated extended states where a countably infinite number of localized states with a diverging localization size condense.
Article
Nanoscience & Nanotechnology
Subhaskar Mandal, Gui-Geng Liu, Baile Zhang
Summary: We study a photonic lattice system where a coherent drive is applied to nonlinear lossy resonators. The system initially has a trivial topology but undergoes a topological phase transition after the application of an additional coherent pulse, which modifies the system's couplings. Interestingly, even after the pulse dies out, the system retains the acquired topological phase, acting as a trigger for amplifying topological modes with frequency conversion and intensity transfer. Our findings have implications for active topological photonic devices.
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
Engineering, Electrical & Electronic
Javier Serrano-Delgado, Santiago Cobreces, Mario Rizo, Emilio Jose Bueno
Summary: This article presents a systematic robust current control design approach for three-phase voltage-source converters, ensuring stability against uncertainty sources with less conservative performance than traditional robust control theories. The approach utilizes multiobjective controller synthesis formulation to logically combine robustness requirements with performance objectives, avoiding heuristic iteration. Controller synthesis is done through nonsmooth H infinity optimization technique, providing a controller with lower order than convex optimization definitions of the H infinity control problem. The methodology is validated through theoretical analysis and experimental results with different grid filters.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2021)
Article
Optics
Ling-Ling Du, Zhi-Bing Wang, Fa-Cheng Jin, Guo-Li Wang, Peng-Cheng Li
Summary: The effects of laser-induced ac Stark shift on high-order harmonic generation of H-2(+) molecular ions below the ionization threshold were investigated. Sub-peak harmonics generated near odd harmonics were observed, and were found to result from the transition between the excited and ground states related to ac Stark shift. Additionally, fine oscillatory structures of the sub-peak harmonics were discovered due to spectral interference. The generation and spectral oscillations of sub-peak harmonics can be controlled by laser intensity and pulse duration.
LASER PHYSICS LETTERS
(2023)
Article
Physics, Multidisciplinary
Grazia Salerno, Rebecca Heilmann, Kristian Arjas, Kerttu Aronen, Jani-Petri Martikainen, Paivi Torma
Summary: Experimental observation of lasing in a hexamer plasmonic lattice revealed changes in polarization properties of the emission with tuning of the unit cell scale. Theoretical analysis identified the lasing modes as quasi-bound-states in continuum with topological charges of zero, one, or two. T-matrix simulation of the structure showed that the mode quality factors depended on the unit cell scale, favoring highest-Q modes for lasing.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Bettina Gertjerenken, Martin Holthaus
Article
Physics, Multidisciplinary
Bettina Gertjerenken, Martin Holthaus
Article
Physics, Multidisciplinary
Soeren Sanders, Christoph Heinisch, Martin Holthaus
Article
Optics
Martin Holthaus
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS
(2016)
Article
Optics
Christoph Heinisch, Martin Holthaus
JOURNAL OF MODERN OPTICS
(2016)
Article
Chemistry, Physical
Christoph Heinisch, Martin Holthaus
ZEITSCHRIFT FUR NATURFORSCHUNG SECTION A-A JOURNAL OF PHYSICAL SCIENCES
(2016)
Article
Physics, Multidisciplinary
Soeren Sanders, Martin Holthaus
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
(2017)
Article
Physics, Multidisciplinary
Soeren Sanders, Martin Holthaus
NEW JOURNAL OF PHYSICS
(2017)
Article
Physics, Multidisciplinary
Soeren Sanders, Martin Holthaus
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
(2019)
Article
Mathematics, Applied
Heinz-Juergen Schmidt, Juergen Schnack, Martin Holthaus
Summary: The study focuses on the analytical solution and time evolution of a two-level system under a specific external field, calculating the time evolution and quasienergy to understand the system properties.
APPLICABLE ANALYSIS
(2021)
Article
Multidisciplinary Sciences
Onno R. Diermann, Martin Holthaus
SCIENTIFIC REPORTS
(2019)
Article
Physics, Multidisciplinary
Nils Krueger, Martin Holthaus
Summary: An iterative algorithm has been developed to calculate individual Floquet states for high-dimensional Hilbert spaces, with a proposed strategy for tracking state changes. Applied to a Bose-Hubbard chain, it demonstrates efficient population of target Floquet states, showing the algorithm's potential for future research in many-body Floquet systems.
PHYSICAL REVIEW RESEARCH
(2021)
Article
Physics, Multidisciplinary
Onno R. Diermann, Heinz-Jurgen Schmidt, Juergen Schnack, Martin Holthaus
PHYSICAL REVIEW RESEARCH
(2020)
Article
Physics, Fluids & Plasmas
Heinz-Juergen Schmidt, Juergen Schnack, Martin Holthaus
Article
Physics, Fluids & Plasmas
Onno R. Diermann, Helge Frerichs, Martin Holthaus