检索结果-内蒙古大学图书馆

Valley-selective optical Stark effect probed by Kerr rotation

Physical Review B 2018年第4期97卷 045307-045307页

作者： Trevor LaMountain Hadallia Bergeron Itamar Balla Teodor K. Stanev Mark C. Hersam Nathaniel P. Stern Applied Physics Program Northwestern University Evanston Illinois 60208 USA Department of Materials Science and Engineering Northwestern University Evanston Illinois 60208 USA Department of Physics and Astronomy Northwestern University Evanston Illinois 60208 USA Department of Chemistry Northwestern University Evanston Illinois 60208 USA Department of Electrical Engineering and Computer Science Northwestern University Evanston Illinois 60208 USA

The ability to monitor and control distinct states is at the heart of emerging quantum technologies. The valley pseudospin in transition metal dichalcogenide (TMDC) monolayers is a promising degree of freedom for such control, with the optical Stark effect allowing for valley-selective manipulation of energy levels in WS2 and WSe2 using ultrafast optical pulses. Despite these advances, understanding of valley-sensitive optical Stark shifts in TMDCs has been limited by reflectance-based detection methods where the signal is small and prone to background effects. More sensitive polarization-based spectroscopy is required to better probe ultrafast Stark shifts for all-optical manipulation of valley energy levels. Here, we show time-resolved Kerr rotation to be a more sensitive probe of the valley-selective optical Stark effect in monolayer TMDCs. Compared to the established time-resolved reflectance methods, Kerr rotation is less sensitive to background effects. Kerr rotation provides a fivefold improvement in the signal-to-noise ratio of the Stark effect optical signal and a more precise estimate of the energy shift. This increased sensitivity allows for observation of an optical Stark shift in monolayer MoS2 that exhibits both valley and energy selectivity, demonstrating the promise of this method for investigating this effect in other layered materials and heterostructures.

关键词： Dielectric properties Excitons Semiconductors Transition metal dichalcogenides Kerr effect Reflectivity

来源：评论

学校读者我要写书评

暂无评论

Switchable and unidirectional plasmonic beacons in hyperbolic two-dimensional materials

引用

Physical Review B 2019年第20期99卷 201405(R)-201405(R)页

作者： Andrei Nemilentsau Tobias Stauber Guillermo Gómez-Santos Mitchell Luskin Tony Low Department of Electrical & Computer Engineering University of Minnesota Minneapolis Minnesota 55455 USA Materials Science Factory Instituto de Ciencia de Materiales de Madrid CSIC E-28049 Madrid Spain Departamento de Física de la Materia Condensada Instituto Nicolás Cabrera and Condensed Matter Physics Center (IFIMAC) Universidad Autónoma de Madrid E-28049 Madrid Spain School of Mathematics University of Minnesota Minneapolis Minnesota 55455 USA

In hyperbolic two-dimensional (2D) materials, energy is channeled into their deep subwavelength polaritonic modes via four narrow beams. Here, we consider the launching of surface polaritons in hyperbolic 2D materials and demonstrate that efficient unidirectional excitation is possible with an elliptically polarized electric dipole, with the optimal choice of dipole ellipticity depending on the materials' optical constants. The selection rules afforded by the choice of dipole polarization allow turning off up to two beams, and even three if the dipole is placed close to an edge. This makes the dipole a directionally switchable beacon for the launching of subdiffractional polaritonic beams, a potential logical gate. We develop an analytical approximation of the excitation process which describes well the results of the numerical simulations and affords a simple physical interpretation.

关键词： Nanoantennas Photonics Plasmonics Plasmons Hyperbolic metamaterials Metamaterials

来源：评论

学校读者我要写书评

暂无评论

Remote Blind State Preparation with Weak Coherent Pulses in the Field

引用

Physical Review Letters 2019年第10期123卷 100503-100503页

作者： Yang-Fan Jiang Kejin Wei Liang Huang Ke Xu Qi-Chao Sun Yu-Zhe Zhang Weijun Zhang Hao Li Lixing You Zhen Wang Hoi-Kwong Lo Feihu Xu Qiang Zhang Jian-Wei Pan Shanghai Branch National Laboratory for Physical Sciences at Microscale and Department of Modern Physics University of Science and Technology of China Shanghai 201315 China Synergetic Innovation Center of Quantum Information and Quantum Physics University of Science and Technology of China Hefei Anhui 230026 China Centre for Quantum Information and Quantum Control Department of Electrical & Computer Engineering and Department of Physics University of Toronto Toronto Ontario M5S 3G4 Canada State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai 200050 China

Quantum computing has seen tremendous progress in past years. Due to implementation complexity and cost, the future path of quantum computation is strongly believed to delegate computational tasks to powerful quantum servers on the cloud. Universal blind quantum computing (UBQC) provides the protocol for the secure delegation of arbitrary quantum computations, and it has received significant attention. However, a great challenge in UBQC is how to transmit a quantum state over a long distance securely and reliably. Here, we solve this challenge by proposing a resource-efficient remote blind qubit preparation (RBQP) protocol, with weak coherent pulses for the client to produce, using a compact and low-cost laser. We experimentally verify a key step of RBQP—quantum nondemolition measurement—in the field test over 100 km of fiber. Our experiment uses a quantum teleportation setup in the telecom wavelength and generates 1000 secure qubits with an average fidelity of (86.9±1.5)%, which exceeds the quantum no-cloning fidelity of equatorial qubit states. The results prove the feasibility of UBQC over long distances, and thus serves as a key milestone towards secure cloud quantum computing.

关键词： Optical quantum information processing Quantum computation Quantum cryptography Quantum optics Quantum protocols Quantum teleportation

来源：评论

学校读者我要写书评

暂无评论

Nonlocal Spin Transport Mediated by a Vortex Liquid in Superconductors

引用

Physical Review Letters 2018年第18期121卷 187203-187203页

作者： Se Kwon Kim Roberto Myers Yaroslav Tserkovnyak Department of Physics and Astronomy University of California Los Angeles California 90095 USA Department of Physics and Astronomy University of Missouri Columbia Missouri 65211 USA Department of Materials Science and Engineering The Ohio State University Columbus Ohio 43210 USA Department of Electrical and Computer Engineering The Ohio State University Columbus Ohio 43210 USA

Departing from the conventional view on superconducting vortices as a parasitic source of dissipation for charge transport, we propose to use mobile vortices as topologically stable information carriers. To this end, we start by constructing a phenomenological theory for the interconversion between spin and vorticity, a topological charge carried by vortices, at the interface between a magnetic insulator and a superconductor, by invoking the interfacial spin Hall effect therein. We then show that a vortex liquid in superconductors can serve as a spin-transport channel between two magnetic insulators by encoding spin information in the vorticity. The vortex-mediated nonlocal signal between the two magnetic insulators is shown to decay algebraically as a function of their separation, contrasting with the exponential decay of the quasiparticle-mediated spin transport. We envision that hydrodynamics of topological excitations, such as vortices in superconductors and domain walls in magnets, may serve as a universal framework to discuss long-range transport properties of ordered materials.

关键词： Nucleation on surfaces Spin Hall effect Spintronics Superconductivity Topological defects Vortex flows Vortices in superconductors

来源：评论

学校读者我要写书评

暂无评论

Quantum metamaterial for nondestructive microwave photon counting

arXiv

引用

arXiv 2020年

作者： Grimsmo, Arne Løhre Royer, Baptiste Kreikebaum, John Mark Ye, Yufeng O'Brien, Kevin Siddiqi, Irfan Blais, Alexandre Institut quantique Départment de Physique Université de Sherbrooke SherbrookeQCJ1K 2R1 Canada Centre for Engineered Quantum Systems School of Physics The University of Sydney SydneyNSW2006 Australia Department of Physics Yale University New HavenCT06520 United States Materials Science Division Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Quantum Nanoelectronics Laboratory Department of Physics University of California BerkeleyCA94720 United States Research Laboratory of Electronics Massachusetts Institute of Technology CambridgeMA02139 United States Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology CambridgeMA02139 United States Canadian Institute for Advanced Research Toronto Canada

Detecting traveling photons is an essential primitive for many quantum information processing tasks. We introduce a single-photon detector design operating in the microwave domain, based on a weakly nonlinear metamaterial where the nonlinearity is provided by a large number of Josephson junctions. The combination of weak nonlinearity and large spatial extent circumvents well-known obstacles limiting approaches based on a localized Kerr medium. Using numerical many-body simulations we show that the single-photon detection fidelity increases with the length of the metamaterial to approach one at experimentally realistic lengths. A remarkable feature of the detector is that the metamaterial approach allows for a large detection bandwidth. In stark contrast to conventional photon detectors operating in the optical domain, the photon is not destroyed by the detection and the photon wavepacket is minimally disturbed. The detector design we introduce offers new possibilities for quantum information processing, quantum optics and metrology in the microwave frequency domain. Copyright © 2020, The Authors. All rights reserved.

关键词： Photons

来源：评论

学校读者我要写书评

暂无评论

Erratum: “Adsorption-controlled growth of Ga2O3 by suboxide molecular-beam epitaxy,” [APL. Mater. 9, 031101 (2021)]

引用

APL materials 2021年第4期9卷

作者： Patrick Vogt Felix V. E. Hensling Kathy Azizie Celesta S. Chang David Turner Jisung Park Jonathan P. McCandless Hanjong Paik Brandon J. Bocklund Georg Hoffmann Oliver Bierwagen Debdeep Jena Huili G. Xing Shin Mou David A. Muller Shun-Li Shang Zi-Kui Liu Darrell G. Schlom 1Department of Materials Science and Engineering Cornell University Ithaca New York 14853 USA 2School of Applied and Engineering Physics Cornell University Ithaca New York 14853 USA 3Air Force Research Laboratory Materials and Manufacturing Directorate Wright Patterson AFB Ohio 45433 USA 4Azimuth Corporation 2970 Presidential Drive Suite 200 Fairborn Ohio 45324 USA 5School of Electrical and Computer Engineering Cornell University Ithaca New York 14853 USA 6Platform for the Accelerated Realization Analysis and Discovery of Interface Materials (PARADIM) Cornell University Ithaca New York 14853 USA 7Department of Materials Science and Engineering Pennsylvania State University University Park Pennsylvania 16802 USA 8Paul-Drude-Institut für Festkörperelektronik Leibniz-Institut im Forschungsverbund Berlin e.V. Hausvogteiplatz 5-7 10117 Berlin Germany 9Kavli Institute at Cornell for Nanoscale Science Ithaca New York 14853 USA 10Leibniz-Institut für Kristallzüchtung Max-Born-Str. 2 12489 Berlin Germany

In the original article,1 the author Georg Hoffmann was misspelled as “Georg Hoffman.” The name appears correctly above.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Full-color complex-amplitude vectorial holograms based on multi-freedom metasurfaces

arXiv

引用

arXiv 2019年

作者： Deng, Zi-Lan Jin, Mingke Ye, Xuan Wang, Shuai Shi, Tan Deng, Junhong Mao, Ningbin Cao, Yaoyu Guan, Bai-Ou Alù, Andrea Li, Guixin Li, Xiangping Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications Institute of Photonics Technology Jinan University Guangzhou510632 Department of Materials Science and Engineering Southern University of Science and Technology Shenzhen518055 China Shenzhen Institute for Quantum Science and Engineering Southern University of Science and Technology Shenzhen518055 China Photonics Initiative Advanced Science Research Center City University of New York 85 St. Nicholas Terrace New YorkNY10031 United States Physics Program Graduate Center City University of New York 365 Fifth Avenue New YorkNY10016 United States Department of Electrical Engineering City College of New York New YorkNY10031 United States

Phase, polarization, amplitude and frequency represent the basic dimensions of light, playing crucial roles for both fundamental light-mater interactions and all major optical applications. Metasurface emerges as a compact platform to manipulate these knobs, but previous metasurfaces have limited flexibility to simultaneous control them. Here, we introduce a multi-freedom metasurface that can simultaneously and independently modulate phase, polarization and amplitude in an analytical form, and further realize frequency multiplexing by a k-space engineering technique. The multi-freedom metasurface seamlessly combine geometric Pancharatnam-Berry phase and detour phase, both of which are frequency-independent. As a result, it allows complex-amplitude vectorial hologram at various frequencies based on the same design strategy, without sophisticated nanostructure searching of massive size parameters. Based on this principle, we experimentally demonstrate full-color complex-amplitude vectorial meta-holograms in the visible with a metal-insulator metal architecture, unlocking the long-sought full potential of advanced light field manipulation through ultrathin metasurfaces. Copyright © 2019, The Authors. All rights reserved.

关键词： Polarization

来源：评论

学校读者我要写书评

暂无评论

Clustering of transcriptomic data for the identification of cancer subtypes

arXiv

引用

arXiv 2018年

作者： Chen, Xiaochun Wang, Honggang Yan, Donghui Department of Electrical and Computer Engineering University of Massachusetts Dartmouth MA United States Department of Mathematics and Program in Data Science University of Massachusetts Dartmouth MA United States

Cancer is a number of related yet highly heterogeneous diseases. Correct identification of cancer subtypes is critical for clinical decisions. The advance in sequencing technologies has made it possible to study cancer based on abundant genomics and transcriptomic (-omics) data. Such a data-driven approach is expected to address limitations and issues with traditional methods in identifying cancer subtypes. We evaluate the suitability of clustering–a data mining tool to study heterogenous data when there is a lack of sufficient understanding of the subject matters–in the identification of cancer subtypes. A number of popular clustering algorithms and their consensus are explored, and we find cancer subtypes identified by consensus clustering agree well with clinical studies. Copyright © 2018, The Authors. All rights reserved.

关键词： Clustering algorithms

来源：评论

学校读者我要写书评

暂无评论

Emerging Photoluminescence from the Dark-Exciton Phonon Replica in Monolayer WSe2

arXiv

引用

arXiv 2019年

作者： Li, Zhipeng Wang, Tianmeng Jin, Chenhao Lu, Zhengguang Lian, Zhen Meng, Yuze Blei, Mark Gao, Shiyuan Taniguchi, Takashi Watanabe, Kenji Ren, Tianhui Tongay, Sefaattin Yang, Li Smirnov, Dmitry Cao, Ting Shi, Su-Fei Department of Chemical and Biological Engineering Rensselaer Polytechnic Institute TroyNY12180 United States School of Chemistry and Chemical Engineering Shanghai Jiao Tong University Shanghai200240 China Kavli Institute at Cornell for Nanoscale Science IthacaNY14853 National High Magnetic Field Lab TallahasseeFL32310 United States Department of Physics Florida State University TallahasseeFL32306 United States College of Physics Nanjing University Nanjing210093 China National Institute for Materials Science 1-1 Namiki Tsukuba305-0044 Japan School for Engineering of Matter Transport and Energy Arizona State University TempeAZ85287 United States Department of Physics Washington University in St. Louis St. LouisMO63136 United States Geballe Laboratory for Advanced Materials Stanford University StanfordCA94305 United States Department of Materials Science and Engineering University of Washington SeattleWA98195 United States Department of Electrical Computer & Systems Engineering Rensselaer Polytechnic Institute TroyNY12180 United States

Tungsten-based monolayer transition metal dichalcogenides host a long-lived "dark" exciton, an electron-hole pair in a spin-triplet configuration. The long lifetime and unique spin properties of the dark exciton provide exciting opportunities to explore light-matter interactions beyond electric dipole transitions. Here we demonstrate that the coupling of the dark exciton and an optically silent chiral phonon enables the intrinsic photoluminescence of the dark-exciton replica in monolayer WSe2. Gate and magnetic-field dependent PL measurements unveil a circularly-polarized replica peak located below the dark exciton by 21.6 meV, equal to E′′ phonon energy from Se vibrations. First-principles calculations show that the exciton-phonon interaction selectively couples the spin-forbidden dark exciton to the intravalley spin-allowed bright exciton, permitting the simultaneous emission of a chiral phonon and a circularly-polarized photon. Our discovery and understanding of the phonon replica reveals a chirality dictated emission channel of the phonons and photons, unveiling a new route of manipulating valley-spin. Copyright © 2019, The Authors. All rights reserved.

关键词： Monolayers

来源：评论

学校读者我要写书评

暂无评论

Organic Memristors: Nanometer‐Scale Uniform Conductance Switching in Molecular Memristors (Adv. Mater. 42/2020)

引用

Advanced materials 2020年第42期32卷

作者： Sreetosh Goswami Debalina Deb Agnès Tempez Marc Chaigneau Santi Prasad Rath Manohar Lal Ariando R. Stanley Williams Sreebrata Goswami Thirumalai Venkatesan NUSNNI‐NanoCore National University of Singapore Singapore 117411 Singapore NUS Graduate School for Integrative Sciences and Engineering (NGS) National University of Singapore Singapore 117456 Singapore Department of Physics National University of Singapore Singapore 117542 Singapore Department of Physics University of Kalyani Kalyani West Bengal 741235 India HORIBA FRANCE SAS HORIBA Scientific Palaiseau 91120 France School of Chemical Sciences Indian Association for the Cultivation of Science Jadavpur Kolkata West Bengal 700032 India Department of Electrical and Computer Engineering National University of Singapore Singapore 117583 Singapore Department of Electrical and Computer Engineering Texas A&M University College Station TX 77843 USA Materials Science and Engineering Department National University of Singapore Singapore 117575 Singapore

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：