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arXiv 2025年

作者： Logan, Jack A. Sumner, Jacob Grigas, Alex T. Shattuck, Mark D. O'Hern, Corey S. Department of Mechanical Engineering Yale University New HavenCT06520 United States Graduate Program in Computational Biology & Biomedical Informatics Yale University New HavenCT06520 United States Integrated Graduate Program in Physical and Engineering Biology Yale University New HavenCT06520 United States Benjamin Levich Institute and Physics Department The City College of New York New YorkNY10031 United States Department of Applied Physics Yale University New HavenCT06520 United States Department of Physics Yale University New HavenCT06520 United States

Proteins are composed of linear chains of amino acids that fold into complex three-dimensional structures. A general feature of folded proteins is that they are compact with a radius of gyration Rg(N) ∼ Nν that obeys power-law scaling with the number of amino acids N in each protein and ν ∼ 1/3. In this study, we investigate the internal scaling of the radius of gyration Rg(n) versus the chemical separation n between amino acids for all subchains of length n. We show that for globular proteins Rg(n) ∼ nν1,2 with a larger exponent ν1 > 1/3 for small n and a smaller exponent ν2 g(N) ∝ Nν. To describe this scaling behavior for Rg(n), we carry out folding simulations for a series of coarse-grained models for proteins beginning with the freely-jointed and freely-rotating chain models composed of spherical monomers and varying degrees of stereochemical constraints. We show that a minimal model, which coarse-grains amino acids into a single spherical backbone atom and one variable-sized spherical side-chain atom, and enforces bend- and dihedral-angle constraints, can recapitulate Rg(n) for x-ray crystal structures of globular proteins. In addition, this model predicts the correct average packing fraction and size of the hydrophobic core, which are two key physical features that can be used to distinguish between computational 'decoys' and correctly folded proteins in protein design applications. © 2025, CC BY.

关键词： Spheres

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Spectrophotometric reverberation mapping of Intermediate-mass black hole NGC 4395

arXiv

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arXiv 2024年

作者： Pandey, Shivangi Rakshit, Suvendu Chand, Krishan Stalin, C.S. Cho, Hojin Woo, Jong-Hak Jalan, Priyanka Mandal, Amit Kumar Omar, Amitesh Jose, Jincen Gupta, Archana Aryabhatta Research Institute of Observational Sciences Uttarakhand Nainital263001 India Department of Applied Physics/Physics Mahatma Jyotiba Phule Rohilkhand University Bareilly243006 India Department of Physics and Astronomical Science Central University of Himachal Pradesh Kangra Himachal Pradesh Dharamshala176215 India Indian Institute of Astrophysics Block II Koramangala Bangalore560034 India Department of Physics & Astronomy Seoul National University Seoul08826 Korea Republic of Center for Theoretical Physics The Polish Academy of Sciences Al. Lotników 32/46 Warsaw02-668 Poland Astronomy Program Department of Physics and Astronomy Seoul National University Seoul08826 Korea Republic of Indian Institute of Technology Kanpur Uttar Pradesh Kanpur208016 India Center for Basic Sciences Pt. Ravishankar Shukla University Chhattisgarh Raipur492010 India

Understanding the origins of massive black hole seeds and their co-evolution with their host galaxy requires studying intermediate-mass black holes (IMBHs) and estimating their mass. However, measuring the mass of these IMBHs is challenging due to the high spatial resolution requirement. A spectrophotometric reverberation monitoring is performed for a low-luminosity Seyfert 1 galaxy NGC 4395 to measure the size of the broad line region (BLR) and black hole mass. The data were collected using the 1.3-m Devasthal fast optical telescope (DFOT) and 3.6-m Devasthal optical telescope (DOT) at ARIES, Nainital, over two consecutive days in March 2022. The analysis revealed strong emission lines in the spectra and light curves of merged 5100Å spectroscopic continuum flux (f5100) with photometric continuum V-band and Hα, with fractional variabilities of 6.38% and 6.31% respectively. In comparison to several previous studies with lag estimation line) of the broad line clouds is measured to be (Equation presented) km s−1, yielding a black hole mass of (Equation presented) and an Eddington ratio of 0.06. © 2024, CC BY.

关键词： Reverberation

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基于合成磁场的声学非互易

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Science Bulletin 2023年第19期68卷 2164-2169,M0003页

作者：陈召宪李正伟翁经锴梁彬陆延青程建春 Andrea Alù Collaborative Innovation Center of Advanced Microstructures Key Laboratory of Modern Acoustics of Ministry of EducationInstitute of AcousticsDepartment of PhysicsNanjing UniversityNanjing 210093China College of Engineering and Applied Sciences Nanjing UniversityNanjing 210093China Photonics Initiative Advanced Science Research CenterCity University of New YorkNew York NY 10031USA Physics Program Graduate CenterCity University of New YorkNew York NY 10016USA

通过设计特定的时空调制,合成磁性的概念最近被提出以实现对光子和声子等电荷中性粒子的非互易操控,但现有方案存在着隔离度低、信号频率变化等问题.本文设计了一种新型耦合共振腔系统,其中动态耦合的相位作为实现声学合成磁场的新机制... 详细信息

通过设计特定的时空调制,合成磁性的概念最近被提出以实现对光子和声子等电荷中性粒子的非互易操控,但现有方案存在着隔离度低、信号频率变化等问题.本文设计了一种新型耦合共振腔系统,其中动态耦合的相位作为实现声学合成磁场的新机制并打破了系统的时间反演对称性,最终取得了优异的声波非互易传输.基于旋转波近似方法,作者严格推导出了实现系统强非互易声传输的参数条件.通过优化动态耦合之间的相位差以及耦合强度,实验展示了隔离度达45-dB和正向传输率达0.85的优异单向声传输.此外,这种单向声传输具有始末态频率不变和隔离方向可电控等重要特性.该研究突破了现有声波单向操控机制在效率和隔离度方面的局限,并为实现弗洛奎和非线性声学拓扑绝缘体提供了新途径.

关键词：隔离度信号频率动态耦合非线性声学拓扑绝缘体耦合共振耦合强度声传输

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Direct Visualization of a Disorder Driven Electronic Smectic Phase in Dirac Nodal Line Semimetal GdSbTe

arXiv

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arXiv 2024年

作者： Venkatesan, Balaji Guan, Syu-You Chang, Jen-Te Chiu, Shiang-Bin Yang, Po-Yuan Su, Chih-Chuan Chang, Tay-Rong Raju, Kalaivanan Sankar, Raman Fongchaiya, Somboon Chu, Ming-Wen Chang, Chia-Seng Chang, Guoqing Lin, Hsin Del Maestro, Adrian Kao, Ying-Jer Chuang, Tien-Ming Department of Physics National Taiwan University Taipei10617 Taiwan Nano Science and Technology Program Taiwan International Graduate Program Academia Sinica National Taiwan University Taipei11529 Taiwan Institute of Physics Academia Sinica Taipei11529 Taiwan Department of Physics National Cheng-Kung University Tainan701 Taiwan Center for Condensed Matter Sciences National Taiwan University Taipei10617 Taiwan Molecular Science and Technology Program Taiwan International Graduate Program Academia Sinica Taipei11529 Taiwan Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University 21 Nanyang Link 637371 Singapore Department of Physics and Astronomy University of Tennessee KnoxvilleTN37996 United States Institute for Advanced Materials & Manufacturing University of Tennessee KnoxvilleTN37996 United States Min H. Kao Department of Electrical Engineering and Computer Science University of Tennessee KnoxvilleTN37996 United States Center for Quantum Science and Technology National Taiwan University Taipei10607 Taiwan

Electronic liquid crystal (ELC) phases are spontaneous symmetry breaking states believed to arise from strong electron correlation in quantum materials such as cuprates and iron pnictides. Here, we report a direct observation of a smectic phase in a weakly correlated Dirac nodal line (DNL) semimetal GdSbxTe2-x. Incommensurate smectic charge modulation and intense local unidirectional nanostructure are visualized by using spectroscopic imaging - scanning tunneling microscopy. As topological materials with symmetry protected Dirac or Weyl fermions are mostly weakly correlated, the discovery of such an ELC phase are anomalous and raise questions on the origin of their emergence. Specifically, we demonstrate how chemical substitution generates these symmetry breaking phases before the system undergoes a charge density wave (CDW) - orthorhombic structural transition. Our results highlight the importance of impurities in realizing ELC phases and present a new material platform for exploring the interplay among quenched disorder, topology and electron correlation. Copyright © 2024, The Authors. All rights reserved.

关键词： Charge density waves

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Nonlinear and nonreciprocal transport effects in untwinned thin films of ferromagnetic Weyl metal SrRuO3

arXiv

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arXiv 2023年

作者： Kar, Uddipta Lu, Elisha Cho-Hao Singh, Akhilesh Kr Reddy, P.V. Sreenivasa Han, Youngjoon Li, Xinwei Cheng, Cheng-Tung Yang, Song Lin, Chun-Yen Cheng, I-Chun Hsu, Chia-Hung Hsieh, David Lee, Wei-Cheng Guo, Guang-Yu Lee, Wei-Li Institute of Physics Academia Sinica Nankang Taipei11529 Taiwan Department of Physics National Taiwan University Taipei10617 Taiwan Department of Physics Applied Physics and Astronomy Binghamton University BinghamtonNY13902 United States Department of Physics California Institute of Technology PasadenaCA91125 United States Scientific Research Division National Synchrotron Radiation Research Center Hsinchu30076 Taiwan Nano Science and Technology Taiwan International Graduate Program Academia Sinica National Taiwan University Taipei Taiwan Physics Division National Center for Theoretical Sciences Taipei10617 Taiwan Graduate Institute of Photonics and Optoelectronics National Taiwan University Taipei Taiwan

The identification of distinct charge transport features, deriving from nontrivial bulk band and surface states, has been a challenging subject in the field of topological systems. In topological Dirac and Weyl semimetals, nontrivial conical bands with Fermi-arc surface states give rise to negative longitudinal magnetoresistance due to chiral anomaly effect and unusual thickness dependent quantum oscillation from Weyl-orbit effect, which were demonstrated recently in experiments. In this work, we report the experimental observations of large nonlinear and nonreciprocal transport effects for both longitudinal and transverse channels in an untwinned Weyl metal of SrRuO3 thin film grown on a SrTiO3 substrate. From rigorous measurements with bias current applied along various directions with respect to the crystalline principal axes, the magnitude of nonlinear Hall signals from the transverse channel exhibits a simple sinα dependence at low temperatures, where α is the angle between bias current direction and orthorhombic [001]o, reaching a maximum when current is along orthorhombic [11¯0]o. On the contrary, the magnitude of nonlinear and nonreciprocal signals in the longitudinal channel attains a maximum for bias current along [001]o, and it vanishes for bias current along [11¯0]o. The observed α-dependent nonlinear and nonreciprocal signals in longitudinal and transverse channels reveal a magnetic Weyl phase with an effective Berry curvature dipole along [11¯0]o from surface states, accompanied by 1D chiral edge modes along [001]o Copyright © 2023, The Authors. All rights reserved.

关键词： Surface states

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Quantum-Classical-Quantum Workflow in Quantum-HPC Middleware with GPU Acceleration

Quantum-Classical-Quantum Workflow in Quantum-HPC Middleware...

引用

Quantum Communications, Networking, and Computing (QCNC), International Conference on

作者： Kuan-Cheng Chen Xiaoren Li Xiaotian Xu Yun-Yuan Wang Chen-Yu Liu Centre for Quantum Engineering Science and Technology (QuEST) Imperial College London London UK Department of Materials Imperial College London London UK Department of Physics and Astronomy University of Waterloo Waterloo Canada NVidia AI Technology Center (NVAITC) NVIDIA Corp. Taipei Taiwan Graduate Institute of Applied Physics National Taiwan University Taipei Taiwan

ISBN: (数字)9798350366778

ISBN: (纸本)9798350366785

Achieving high-performance computation on quantum systems is challenging, requiring integration between quantum and classical computing resources. This study presents a distribution-aware Quantum-Classical-Quantum (QCQ) architecture that combines advanced quantum software frameworks with high-performance classical computing to improve quantum simulations for materials and condensed matter physics, including the prediction of quantum phase transitions. The architecture employs Variational Quantum Eigensolver (VQE) algorithms on Quantum Processing Units (QPUs) for efficient quantum state preparation, and Tensor Network states and Quantum Convolutional Neural Networks (QCNNs) on classical hardware for state classification. Utilizing the cuQuantum SDK and PennyLane's Lightning plugin, the QCQ architecture achieves up to tenfold increases in computational speed for complex phase transition classification tasks compared to traditional CPU-based methods, demonstrating 99.5% accuracy in predicting phase transitions in models like the transverse field Ising and XXZ systems. This framework integrates quantum algorithms, machine learning, and Quantum-HPC capabilities, offering transformative insights into the behavior of quantum systems across different scales. As quantum hardware continues to improve, the QCQ framework will play a crucial role in realizing the full potential of quantum computing by seamlessly integrating distributed quantum resources with state-of-the-art classical computing infrastructure.

关键词： Quantum system Quantum computing Accuracy Machine learning algorithms Tensors Computer architecture Prediction algorithms

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In-orbit performance of the Xtend-XMA onboard XRISM

In-orbit performance of the Xtend-XMA onboard XRISM

引用

Space Telescopes and Instrumentation 2024: Ultraviolet to Gamma Ray

作者： Tamura, Keisuke Hayashi, Takayuki Boissay-Malaquin, Rozenn Okajima, Takashi Sato, Toshiki Eckart, Megan E. Leutenegger, Maurice A. Yaqoob, Tahir Mori, Koji Ishida, Manabu Maeda, Yoshitomo Tomida, Hiroshi Nakajima, Hiroshi Noda, Hirofumi Uchida, Hiroyuki Suzuki, Hiromasa Kobayashi, Shogo B. Yoneyama, Tomokage Hagino, Kouichi Nobukawa, Kumiko K. Tanaka, Takaaki Murakami, Hiroshi Uchiyama, Hideki Nobukawa, Masayoshi Yoshida, Tessei Matsumoto, Hironori Tsuru, Takeshi Go Yamauchi, Makoto Hatsukade, Isamu Odaka, Hirokazu Kohmura, Takayoshi Yamaoka, Kazutaka Kanemaru, Yoshiaki Hiraga, Junko S. Dotani, Tadayasu Ozaki, Masanobu Tsunemi, Hiroshi Miyazaki, Keitaro Kusunoki, Kohei Otsuka, Yoshinori Yokosu, Haruhiko Yonematsu, Wakana Ichikawa, Kazuhiro Nakano, Hanako Takemoto, Reo Matsushima, Tsukasa Asahina, Yoh Fukuda, Masahiro Yoshimoto, Marina Shima, Kohei Aoyagi, Mio Aoki, Yuma Ito, Yamato Aoki, Daiki Fujisawa, Kaito Shimizu, Yasuyuki Higuchi, Mayu Simionescu, Aurora Miller, Eric Brenneman, Laura Hayashida, Kiyoshi BaltimoreMD United States GreenbeltMD United States GreenbeltMD United States Department of Physics School of Science and Technology Meiji University Kanagawa Japan Lawrence Livermore National Laboratory LivermoreCA United States Department of Applied Physics Faculty of Engineering University of Miyazaki Miyazaki Japan Japan Arerospace Exploration Agency kanagawa Japan College of Science and Engineering Kanto Gakuin University Kanagawa Japan Astronomical Institute Tohoku University Miyagi Japan Department of Science Faculty of Science Kyoto University Kyoto Japan Department of Physics Faculty of Science Division Tokyo University of Science Tokyo Japan Department of Physics Faculty of Science and Engineering Chuo University Japan Department of Physics Graduate School of Science University of Tokyo Tokyo Japan Faculty of Science and Engineering Department of Science Kindai University Osaka Japan Faculty of Science and Engineering Department of Physics Konan University Hyogo Japan Faculty of Liberal Arts Department of Information Science Tohoku Gakuin University Miyagi Japan Faculty of Education Shizuoka University Sizuoka Japan Faculty of Education Science Education Nara University of Education Nara Japan Institute for Space-Earth Environmental Research Nagoya University Aichi Japan Department of Physics Faculty of Science Osaka University Osaka Japan School of Science Department of Physics and Astronomy Kwansei Gakuin University Hyogo Japan Advanced Technology Center National Astronomical Observatory of Japan Tokyo Japan SRON Netherlands Institute for Space Research Utrecht Netherlands Kavli Institute for Astrophysics and Space Research Massachusetts Institute of Technology MA02139 United States Harvard-Smithsonian Center for Astrophysics MA02138 United States

ISBN: (纸本)9781510675094

XRISM (X-ray Imaging and Spectroscopy Mission) is an X-ray astronomy satellite developed in collaboration with JAXA, NASA and ESA. It successfully launched on Sept. 7, 2023. Two complementary X-ray telescopes, Resolve and Xtend are on-board XRISM. Resolve uses the pixelized X-ray micro calorimeter developed by NASA/GSFC and has very high energy resolution of 5 eV. On the other hand, Xtend uses an X-ray CCD camera as its focal plane detector which has high spatial resolution and a wide field of view. We evaluated the performance of the X-ray Mirror Assembly (XMA) for Xtend using data observed during the commissioning and PV phases of XRISM. To verify the imaging performance, the Point Spread Functions (PSF) generated from the observations of NGC 4151 and PDS 456 were compared with the ground-calibration results. The results show that the imaging performance of Xtend-XMA is not significantly different from that of the ground calibration, and that it meet the requirement. The effective area was verified by comparing the results of simultaneous observations of 3C 273 by XRISM and four X-ray astronomy satellites (Chandra, XMM-Newton, NuSTAR, and Swift). The results of the fitting of the X-ray spectrum of Xtend show no significant difference from the results of other satellites, suggesting the effective area used for fitting is correct. The on-axis position on the detector was estimated from the intensity of the Abell 2029 observations at four off-axis angles. The on-axis is about 40 arcsec away from the aim point, and the decrease in effective area at the aim point is less than 1%. Stray light observations of the Crab Nebula at 60 arcmin off-axis were obtained at two different satellite roll angles. The stray light intensity obtained at each roll angle was significantly different, verifying the dependence of the stray light on the roll angle. © 2024 SPIE.

关键词： NASA

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Observation of the Magnonic Dicke Superradiant Phase Transition

arXiv

引用

arXiv 2024年

作者： Kim, Dasom Dasgupta, Sohail Ma, Xiaoxuan Park, Joong-Mok Wei, Hao-Tian Luo, Liang Doumani, Jacques Li, Xinwei Yang, Wanting Cheng, Di Kim, Richard H.J. Everitt, Henry O. Kimura, Shojiro Nojiri, Hiroyuki Wang, Jigang Cao, Shixun Bamba, Motoaki Hazzard, Kaden R.A. Kono, Junichiro Applied Physics Graduate Program Smalley–Curl Institute Rice University HoustonTX77005 United States Department of Electrical and Computer Engineering Rice University HoustonTX77005 United States Ames National Laboratory AmesIA50011 United States Department of Physics and Astronomy Rice University HoustonTX77005 United States Department of Physics International Center of Quantum and Molecular Structures Materials Genome Institute Shanghai University Shanghai200444 China Department of Physics National University of Singapore 117551 Singapore Department of Physics and Astronomy Iowa State University AmesIA50011 United States Smalley–Curl Institute Rice University HoustonTX77005 United States DEVCOM Army Research Laboratory-South HoustonTX77005 United States Institute for Materials Research Tohoku University Sendai980-8577 Japan Department of Physics Yokohama National University Yokohama240-8501 Japan Department of Physics and Astronomy University of California DavisCA95616 United States Department of Materials Science and NanoEngineering Rice University HoustonTX77005 United States

Two-level atoms coupled with single-mode cavity photons are predicted to exhibit a quantum phase transition when the coupling strength exceeds a critical value, entering a phase in which atomic polarization and photonic field are finite even at zero temperature and without external driving. However, this phenomenon, the superradiant phase transition (SRPT), is forbidden by a no-go theorem due to the existence of the diamagnetic term in the Hamiltonian. Here, we present spectroscopic evidence for a magnonic SRPT in ErFeO3, where the role of the photonic mode (two-level atoms) in the photonic SRPT is played by an Fe3+ magnon mode (Er3+ spins). The absence of the diamagnetic term in the Fe3+–Er3+ exchange coupling ensures that the no-go theorem does not apply. Terahertz and gigahertz magnetospectroscopy experiments revealed the signatures of the SRPT – a kink and a softening, respectively, of two spin–magnon hybridized modes at the critical point. Copyright © 2024, The Authors. All rights reserved.

关键词： Phase transitions

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Enhancing Fieldwork Productivity in Subsurface Characterization: Advancements in Data Acquisition with Masw-Ds

SSRN

引用

SSRN 2024年

作者： Hamdan, Hamdan Ali Kritikakis, George Elsamani, Mahmoud Harb, Mahmoud Abdel-Fattah, Mohamed Soupios, Pantelis University of Sharjah Petroleum Geosciences and Remote Sensing Program Department of Applied Physics and Astronomy United Arab Emirates Applied Geophysics Lab Technical University of Crete Greece United Arab Emirates Department of Geosciences College of Petroleum Engineering and Geosciences King Fahd University of Petroleum and Minerals Dhahran31261 Saudi Arabia

The Multichannel Analysis of Surface Waves (MASW) method utilizes low-frequency surface waves, to characterize the shallow subsurface layers. It is a very useful tool in geotechnical engineering for evaluating soil quality and mapping the characteristics of the upper sedimentary layers. Despite its efficiency, the limited productivity of conventional MASW due to its relatively slow data acquisition process presents a challenge, especially for large-scale projects, such as those carried out in the Gulf Cooperation Council (GCC) region. To address this issue, we introduce the Multichannel Analysis of Surface Waves-Dual Streamer (MASW-DS) technique to enhance fieldwork productivity by almost 90%. This approach involves towing two parallel land streamers simultaneously behind a truck and enabling the acquisition of data from the two adjacent MASW profiles with a single source activated between the two land streamers. Our study evaluates the precision and effectiveness of MASW-DS through a set of synthetic and real data testing across diverse sites, demonstrating its potential for expedited surveys and reduced project costs. While MASW-DS introduces assumptions that may impact the resulting S-wave profiles, our findings indicate its comparable performance to conventional MASW, with negligible differences in dispersion curves and promising results, even in challenging geological settings. The proposed technique managed to reproduce the S-wave profiles resulting from the classic MASW deployment in the framework of an acceptable error for engineers. These results prove the reliability of the MASW-DS technique for subsurface characterization while achieving significant time and cost savings. MASW-DS also holds the potential for further enhancement by towing more than two land streamers simultaneously, positioning it as a valuable and effective tool for geotechnical investigations and civil engineering projects worldwide. © 2024, The Authors. All rights reserved.

关键词： Geotechnical engineering

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Spin-orbit-locked hyperbolic polariton vortices carrying reconfigurable topological charges

引用

eLight 2022年第1期2卷 143-153页

作者： Mingsong Wang Guangwei Hu Saroj Chand Michele Cotrufo Yohannes Abate Kenji Watanabe Takashi Taniguchi Gabriele Grosso Cheng‑Wei Qiu Andrea Alù Photonics Initiative Advanced Science Research CenterCity University of New YorkNew York CityNY 10031USA Department of Electrical and Computer Engineering National University of SingaporeSingapore 116083Singapore Department of Physics and Astronomy The University of GeorgiaAthensGA 30602USA Research Center for Functional Materials National Institute for Materials ScienceTsukubaIbaraki 305‑0044Japan International Center for Materials Nanoarchitectonics National Institute for Materials ScienceTsukubaIbaraki 305‑0044Japan Physics Program Graduate CenterCity University of New YorkNew YorkNY 10016USA

The topological features of optical vortices have been opening opportunities for free-space and on-chip photonic technologies,e.g.,for multiplexed optical communications and robust information *** a parallel but disjoint effort,polar anisotropic van der Waals nanomaterials supporting hyperbolic phonon polaritons(HP2s)have been leveraged to drastically boost light-matter *** far HP2 studies have been mainly focusing on the control of their amplitude and scale *** we report the generation and observation of mid-infrared hyperbolic polariton vortices(HP2Vs)associated with reconfigurable topological ***-shaped gold disks coated with a flake of hexagonal boron nitride are exploited to tailor spin-orbit interactions and realise deeply subwavelength *** complex interplay between excitation spin,spiral geometry and HP2 dispersion enables robust reconfigurability of the associated topological *** results reveal unique opportunities to extend the application of HP2s into topological photonics,quantum information processing by integrating these phenomena with single-photon emitters,robust on-chip optical applications,sensing and nanoparticle manipulation.

关键词： Hyperbolic polariton vortex Light-matter interactions Spin-orbit interaction Topological charge Reconfigurability

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