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Tunable and enhanced Rashba spin-orbit coupling in iridate-manganite heterostructures

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Physical Review B 2020年第12期102卷 125145-125145页

作者： T. S. Suraj Ganesh Ji Omar Hariom Jani M. M. Juvaid Sonu Hooda Anindita Chaudhuri Andrivo Rusydi K. Sethupathi Thirumalai Venkatesan Ariando Ariando M. S. Ramachandra Rao Department of Physics Nano Functional Materials Technology Center Material Science Research Center Indian Institute of Technology Madras Chennai 600036 India Low Temperature Physics Lab Department of Physics Indian Institute of Technology Madras Chennai 600036 India Department of Physics National University of Singapore Singapore 117542 Singapore NUSNNI-NanoCore National University of Singapore Singapore 117411 Singapore National University of Singapore Graduate School for Integrative Sciences and Engineering (NGS) University Hall 21 Lower Kent Ridge Road Singapore 119077 Singapore Singapore Synchrotron Light Source National University of Singapore 5 Research Link Singapore 117603 Singapore Department of Electrical and Computer Engineering National University of Singapore Singapore 117576 Singapore

Tailoring spin-orbit interactions and Coulomb repulsion are the key features to observe exotic physical phenomena such as magnetic anisotropy and topological spin texture at oxide interfaces. Our study proposes a platform for engineering magnetism and spin-orbit coupling at the LaMnO3/SrIrO3 (3d−5d) oxide interface by tuning the LaMnO3 growth conditions, which controls the lattice displacement and spin-correlated interfacial coupling through charge transfer. We report a tunable and enhanced interface-induced Rashba spin-orbit coupling where the spin relaxation mechanism varies with magnetic behavior of the underlying LaMnO3 layer. The x-ray spectroscopy measurements reveal the quantitative valence states of Mn and their impact on charge transfer. Our angle-dependent magnetoresistance measurements also reflects the signature of magnetic proximity effect in SrIrO3 and can be tuned with the magnetic nature of LaMnO3 in a LaMnO3/SrIrO3 bilayer. Our work demonstrates a route to engineer the interface-induced Rashba spin-orbit coupling and magnetic proximity effect at the 3d−5d oxide interface for spintronics applications.

关键词： Magnetoresistance Rashba coupling Spin relaxation Spin-orbit coupling Interfaces Strongly correlated systems

Tunable plasmonic ultrastrong coupling: Emulating dicke physics at room temperature

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arXiv 2021年

作者： Yahiaoui, Riad Chase, Zizwe A. Kyaw, Chan Tay, Fuyang Baydin, Andrey Noe, G. Timothy Song, Junyeob Kono, Junichiro Agrawal, Amit Bamba, Motoaki Searles, Thomas A. Department of Physics and Astronomy Howard University WashingtonDC20059 United States Department of Electrical and Computer Engineering Rice University HoustonTX70005 United States Applied Physics Graduate Program Smalley-Curl Institute Rice University HoustonTX77005 United States Smalley-Curl Institute Rice University HoustonTX77005 United States Physical Measurement Laboratory National Institute of Standards and Technology GaithersburgMD20899 United States Department of Physics and Astronomy Rice University HoustonTX77005 United States Department of Materials Science and NanoEngineering Rice University HoustonTX77005 United States Maryland NanoCenter University of Maryland College ParkMD20742 United States The Hakubi Center for Advanced Research Kyoto University Kyoto606-8502 Japan Department of Physics I Kyoto University Kyoto606-8502 Japan Department of Physics Massachusetts Institute of Technology CambridgeMA02139 United States

A system of N two-level atoms cooperatively interacting with a photonic field can be described as a single giant atom coupled to the field with interaction strength ∝ √N. This enhancement, known as Dicke cooperativity in quantum optics, has recently become an indispensable element in quantum information technology based on strong light-matter coupling. Here, we extend the coupling beyond the standard light-matter interaction paradigm, emulating Dicke cooperativity in a terahertz metasurface with N meta-atoms. Cooperative enhancement manifested in the form of matter-matter coupling, through the hybridization of localized surface plasmon resonance in individual meta-atoms and surface lattice resonance due to the periodic array of the meta-atoms. By varying the lattice constant of the array, we observe a clear anticrossing behavior, a signature of strong coupling. Furthermore, through engineering of the capacitive split-gap in the meta-atoms, the coupling rate was cooperatively enhanced into the ultrastrong coupling regime by a factor of √N. This room-temperature technology serves as a convenient quantum emulator of the dynamics of a qubit with a giant dipole moment coherently driven by a single bosonic field. Copyright © 2021, The Authors. All rights reserved.

关键词： Atoms

Energy Harvesting and Storage: Energy Harvesting and Storage with Soft and Stretchable materials (Adv. Mater. 19/2021)

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Advanced materials 2021年第19期33卷 2170151-2170151页

作者： Veenasri Vallem Yasaman Sargolzaeiaval Mehmet Ozturk Ying-Chih Lai Michael D. Dickey Department of Chemical and Biomolecular Engineering North Carolina State University Raleigh NC 27695 USA Department of Electrical and Computer Engineering North Carolina State University Raleigh NC 27695 USA Department of Materials Science and Engineering National Chung Hsing University Taichung 402 Taiwan Innovation and Development Center of Sustainable Agriculture Research Center for Sustainable Energy and Nanotechnology National Chung Hsing University Taichung 402 Taiwan

In article number 2004832, Michael D. Dickey and co‐workers highlight methods to convert ambient sources of energy into electricity using soft and stretchable materials. The ability to harness energy from the environment allows soft and stretchable devices to be tetherless, thereby leading to greater range of motion for soft robots, better mechanical compliance for wearables and e‐skins, and increased applications for electronics.

关键词： energy harvesting energy storage soft robotics stretchable electronics

Designing the Application of Security Text Messages into Audio Files Using Data Encryption Standard (DES) Algorithms Using the End of File (EOF) Method 1

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Designing the Application of Security Text Messages into Aud...

1st Workshop on Environmental science, Society, and Technology, WESTECH 2018

作者： Pardede, A.M.H. Pramana, Anggi Zarlis, Muhammad Iskandar, Akbar Manurung, Rosida Tiurma Sriadhi, S. Kurniawan, Citra Hasibuan, Abdurrozzaq Siregar, Nurintan Asyiah Sari, Ayu Esteka Mulyaningsih, Indrya Iskandar Alam, Teguh Hidayat Ibrahim Listyorini, Tri Winarno, Edy Tulus STMIK Kaputama Binjai Sumatera Utara Indonesia Department of Computer Science Universitas Sumatera Utara Medan Indonesia Department of Informatics STMIK AKBA Makassar Indonesia Graduate Program in Scientific Psychology Universitas Kristen Maranatha Indonesia Department of Electrical Engineering Universitas Negeri Medan Indonesia Department of Electrical Engineering Sekolah Tinggi Teknik Malang Indonesia Faculty of Engineering Universitas Islam Sumatera Utara Medan Indonesia Department of Management STIE Labuhanbatu Sumatera Utara Indonesia Department of Management STIE Sakti Alam Kerinci Jambi Indonesia Department of Indonesian Language Teaching Institut Agama Islam Negeri Syekh Nurjati Cirebon Indonesia Department of Informatics Engineering Universitas Muhammadiyah Sorong Sorong Indonesia Department of English Education Universitas Muhammadiyah Sorong Sorong Indonesia Department of Informatics Universitas Muria Kudus Indonesia Faculty of Information Technology Universitas Stikubank Semarang Indonesia Department of Mathematics Universitas Sumatera Utara Medan Indonesia

There are several ways to deal with security issues of confidential data sent via the internet, including using cryptographic techniques and steganography. Steganography is the science and art of concealing information / messages in a media in such a way that its existence is not detected by other parties who are not entitled to the information. Instead, cryptography disguises the meaning of a message, but does not hide that there is a message because the file looks suspicious. The Steganography technique used here was End Of File (EOF). The EOF technique described how to add data or files at the end of the image file. For this technique, the size of data or files that will be hidden could be larger than the size of the image file. The hidden data will be inserted at the end of the file so that it will not affect the image. This steganography application is also equipped with a cryptographic function Data Encryption Standard (DES) at the time of insertion of data that functions as a generator code and encrypts data, so that the security of a data in the file is more protected and protected from those who are not entitled to know the data. © Published under licence by IOP Publishing Ltd.

关键词： Steganography

5G Channel Model for 28 GHz frequency in Palembang

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Journal of Physics: Conference Series 2020年第1期1500卷

作者： B Alfaresi Z Nawawi R F Malik K Anwar Electrical Engineering Universitas Muhammadiyah Palembang Indonesia Doctoral Program of Engineering Science Universitas Sriwijaya Indonesia Electrical Engineering Universitas Sriwijaya Indonesia Computer Science Department Universitas Sriwijaya Indonesia Center for Advanced Wireless Technologies (AdWiTech) Telkom University Indonesia

Next generation wireless technology require a wide frequency band. Current technology use a frequency of below 3 GHz which cannot provide a wide frequency band due to quite dense frequency utilization. The mm-Wave frequency guarantee to provide a wide band frequency band. The use of mm-Wave frequency will be influenced by climate factors. The characteristics of a place will cause a different channel model. Channel Model is useful for minimizes errors and maximizes information transmission or bitrate in communication model. The Channel Model will be represented as a PDP (Power Delay Profile). Channel model performance uses the Outage performance parameter in Shannon Theorem Implementation. Validation results using the CP-OFDM system with 5G BPSK. The parameters used for validation are FER and BER. In this paper, channel models will be analysed based on the characteristic of Palembang area as a reference channel model in Outer of Indonesia. Hopefully, it can be used as a reference for the development 5G wireless system.

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Delta-doped β-Ga2O3 thin films and β-(Al0.26Ga0.74)2O3/β-Ga2O3 heterostructures grown by metalorganic vapor-phase epitaxy

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arXiv 2019年

作者： Ranga, Praneeth Bhattacharyya, Arkka Rishinaramangalam, Ashwin Ooi, Yu Kee Scarpulla, Michael A. Feezell, Daniel Krishnamoorthy, Sriram Department of Electrical and Computer Engineering University of Utah Salt Lake CityUT84112 United States Center for High Technology Materials University of New Mexico AlbuquerqueNM87106 United States Department of Materials Science and Engineering University of Utah Salt Lake CityUT84112 United States

We report on silicon delta doping of metalorganic vapor-phase epitaxy-grown β-Ga2O3 thin films using silane precursor. Delta-doped β-Ga2O3 epitaxial films are characterized using capacitance-voltage profiling and secondary-ion mass spectroscopy. Electron sheet charge density in the range of 2.9 x 1012 cm -2 to 8 x 1012 cm-2 with a half width at half maximum ranging from 6.2 nm – 3.5 nm is measured. We also demonstrate a high density (6.4 x 1012 cm-2) degenerate two-dimensional electron gas using a delta-doped β-(Al0.26Ga0.74)2O3/βGa2O3 heterostructure. Copyright © 2019, The Authors. All rights reserved.

关键词： Capacitance

Magnetic Control of Soft Chiral Phonons in PbTe

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arXiv 2021年

作者： Baydin, Andrey Hernandez, Felix G.G. Rodriguez-Vega, Martin Okazaki, Anderson K. Tay, Fuyang Timothy Noe, G. Katayama, Ikufumi Takeda, Jun Nojiri, Hiroyuki Rappl, Paulo H.O. Abramof, Eduardo Fiete, Gregory A. Kono, Junichiro Department of Electrical and Computer Engineering Rice University HoustonTX77005 United States Smalley-Curl Institute Rice University HoustonTX77005 United States Instituto de Física Universidade de São Paulo SP São Paulo05508-090 Brazil Theoretical Division Los Alamos National Laboratory Los AlamosNM87545 United States Laboratório Associado de Sensores e Materiais Instituto Nacional de Pesquisas Espaciais SP São José dos Campos12201-970 Brazil Applied Physics Graduate Program Smalley-Curl Institute Rice University HoustonTX77005 United States Department of Physics Graduate School of Engineering Science Yokohama National University Yokohama240-8501 Japan Institute for Materials Research Tohoku University Sendai980-8577 Japan Department of Physics Northeastern University BostonMA02115 United States Department of Physics Massachusetts Institute of Technology CambridgeMA02139 United States Department of Physics and Astronomy Rice University HoustonTX77005 United States Department of Material Science and NanoEngineering Rice University HoustonTX77005 United States

PbTe crystals have a soft transverse optical phonon mode in the terahertz frequency range, which is known to efficiently decay into heat-carrying acoustic phonons, resulting in anomalously low thermal conductivity. Here, we studied this phonon via polarization-dependent terahertz spectroscopy. We observed softening of this mode with decreasing temperature, indicative of incipient ferroelectricity, which we explain through a model including strong anharmonicity with a quartic displacement term. In magnetic fields up to 25 T, the phonon mode splits into two modes with opposite handedness, exhibiting circular dichroism. Their frequencies display Zeeman splitting together with an overall diamagnetic shift with increasing magnetic field. Using a group-theoretical approach, we demonstrate that these observations are the result of magnetic field-induced morphic changes in the crystal symmetries through the Lorentz force exerted on the lattice ions. Thus, our study reveals a novel process of controlling phonon properties in a soft ionic lattice by a strong magnetic field. Copyright © 2021, The Authors. All rights reserved.

关键词： Magnetic fields

India's first robotic eye for time domain astrophysics: the GROWTH-India telescope

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arXiv 2022年

作者： Kumar, Harsh Bhalerao, Varun Anupama, G.C. Barway, Sudhanshu Basu, Judhajeet Deshmukh, Kunal De, Kishalay Dutta, Anirban Fremling, Christoffer Iyer, Hrishikesh Jassani, Adeem Joharle, Simran Karambelkar, Viraj Khandagale, Maitreya Krishna, K. Adithya Kulkarni, Sumeet Mate, Sujay Patil, Atharva Phanindra, D.V.S. Samantaray, Subham Sharma, Kritti Sharma, Yashvi Shenoy, Vedant Singh, Avinash Srivastava, Shubham Swain, Vishwajeet Waratkar, Gaurav Angchuk, Dorje Dorjay, Padma Dorjai, Tsewang Gyalson, Tsewang Jorphail, Sonam Mahay, Tashi Thsering Norbu, Rigzin Sharma, Tarun Kumar Stanzin, Jigmet Stanzin, Tsewang Stanzin, Urgain Department of Physics Indian Institute of Technology Bombay Powai400 076 India Indian Institute of Astrophysics 2nd Block 100 Feet Rd Koramangala Bangalore560 034 India Department of Metallurgical Engineering and Materials Science Indian Institute of Technology Bombay Powai Mumbai400076 India Department of Physics and Astronomy Texas Tech University PO Box 41051 LubbockTX79409 United States Division of Physics Mathematics and Astronomy California Institute of Technology PasadenaCA91125 United States MIT-Kavli Institute for Astrophysics and Space Research 77 Massachusetts Ave. CambridgeMA02139 United States Pondicherry University R.V. Nagar Kalapet Puducherry605014 India Department of Electrical and Computer Engineering University of Illinois at Urbana-Champaign UrbanaIL61801 United States Fergusson College Shivajinagar Maharashtra Pune411 004 India Heidelberg University Grabengasse 1 Heidelberg 691 17 Germany 204 Lewis Hall The University of Mississippi OxfordMS38677 United States Department of Astronomy and Astrophysics Tata Institute of Fundamental Research Mumbai400005 India Graduate Institute of Astronomy National Central University 32001 Taiwan Department of Mechanical Engineering Indian Institute of Technology Bombay Powai Mumbai400076 India Hiroshima Astrophysical Science Center Hiroshima University Hiroshima Higashi-Hiroshima739-8526 Japan Astrophysics Research Centre School of Mathematics and Physics Queen's University Belfast BelfastBT7 1NN United Kingdom 194 101 India Physikalisches Institut Universität zu Köln Zülpicher Strasse 77 Cologne50937 Germany

We present the design and performance of the GROWTH-India telescope, a 0.7 m robotic telescope dedicated to time domain astronomy. The telescope is equipped with a 4k back-illuminated camera gives a 0.82◦ field of view and a sensitivity of mg' ∼20.5 in 5-min exposures. Custom software handle observatory operations: attaining high on-sky observing efficiencies ( 80%) and allowing rapid response to targets of opportunity. The data processing pipelines are capable of performing PSF photometry as well as image subtraction for transient searches. We also present an overview of the GROWTH-India telescope's contributions to the studies of Gamma-ray Bursts, the electromagnetic counterparts to gravitational wave sources, supernovae, novae and solar system objects. Copyright © 2022, The Authors. All rights reserved.

关键词： Telescopes

Creating and manipulating a Laughlin-type ν = 1/3 fractional quantum Hall state on a quantum computer with linear depth circuits

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arXiv 2020年

作者： Rahmani, Armin Sung, Kevin J. Putterman, Harald Roushan, Pedram Ghaemi, Pouyan Jiang, Zhang Department of Physics and Astronomy and Advanced Materials Science and Engineering Center Western Washington University BellinghamWA98225 United States Kavli Institute for Theoretical Physics University of California Santa BarbaraCA93106 United States Google AI Quantum Santa BarbaraCA United States Department of Electrical Engineering and Computer Science University of Michigan Ann ArborMI48109 United States Physics Department City College of the City University of New York New YorkNY10031 United States Graduate Center of the City University of New York New YorkNY10016 United States

Here we present an efficient quantum algorithm to generate an equivalent many-body state to Laughlin’s ν = 1/3 fractional quantum Hall state on a digitized quantum computer. Our algorithm only uses quantum gates acting on neighboring qubits in a quasi one-dimensional setting, and its circuit depth is linear in the number of qubits, i.e., the number of Landau orbitals in the second quantized picture. We identify correlation functions that serve as signatures of the Laughlin state and discuss how to obtain them on a quantum computer. We also discuss a generalization of the algorithm for creating quasiparticles in the Laughlin state. This paves the way for several important studies, including quantum simulation of non-equilibrium dynamics and braiding of quasiparticles in quantum Hall states. Copyright © 2020, The Authors. All rights reserved.

关键词： Qubits