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High-temperature Phonon Coherence and Tunneling Effect in Semiconductor Superlattices

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arXiv 2024年

作者： Geng, Zhi-Ming Yao, Jin-Shan Cheng, Ying-Bin Yan, Xue-Jun Zhou, Jian Zhang, En-Rui Li, Jia-Yi Yuan, Ming-Qian Fan, Xing Deng, Yu Lu, Hong Lu, Ming-Hui Chen, Yan-Feng National Laboratory of Solid State Microstructures Department of Materials Science and Engineering College of Engineering and Applied Sciences Nanjing University Nanjing210093 China Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing210093 China Jiangsu Key Laboratory of Artificial Functional Materials Nanjing University Nanjing210093 China

Phonons, the quanta of lattice vibrations, are primary heat carriers for semiconductors and dielectrics. The demand of effective phonon manipulation urgently emerges, because the thermal management is crucial for the ongoing development of micro/nano semiconductor devices towards higher integration and power densities1, 2. Phonons also show wave-particle duality, while they are commonly treated as particle flows in current semiconductor structures3, 4. However, it sees constraints when the structure size reduces to nano and atomic scales, where the wave behavior of phonons begins to dominate, and studies of these phonon behaviors and their manipulations become long-standing challenges in experiments5. Here we show the experimental realization of coherent phonon transport, a wave-based thermal conduction fashion, in semiconductor structures. We report the successful observation of robust phonon coherence and tunneling effect in InAs/AlAs superlattices over an extensive temperature range up to 500 K, a breakthrough towards practical-application temperature for semiconductors compared with cryogenic conditions6. Our results demonstrate that the phonon coherence is robust even at a record-high interface density due to the dominating long-wavelength phonons, and the first-principles calculations clearly reveal their wave-particle duality. This revelation heralds a promising pathway towards efficient thermal phonon engineering at extreme scales, holding implications for a broad spectrum of semiconductor device applications, including microelectronics, optoelectronics, and thermoelectrics. Copyright © 2024, The Authors. All rights reserved.

关键词： Semiconductor superlattices

Vertical cavity using a heterostructure dual-period high-contrast grating

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Vertical cavity using a heterostructure dual-period high-con...

CLEO: science and Innovations, S and I 2022

作者： Zhang, Jing Hao, Chenxi Zheng, Wanhua Liu, Anjin State Key Laboratory on Integrated Optoelectronics Institute of Semiconductors Chinese Academy of Sciences Beijing100083 China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing100049 China Key Laboratory of Solid-State Optoelectronics Information Technology Institute of Semiconductors Chinese Academy of Sciences Beijing100083 China

A vertical cavity using a heterostructure dual-period high-contrast grating with a feature size of about 15 nm is demonstrated for the vertical-cavity surface-emitting laser application. The reflectivity spectra of th... 详细信息

ISBN: (纸本)9781557528209

关键词： Diffraction gratings

Stabilizing Na_(3)SbS_(4)/Na interface by rational design via Cl doping and aqueous processing

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Journal of materials science & Technology 2021年第11期70卷 168-175页

作者： Haonan Cao Meiqi Yu Long Zhang Zhaoxing Zhang Xinlin Yan Peng Li Chuang Yu Clean Nano Energy Center State Key Laboratory of Metastable Materials Science and TechnologyYanshan UniversityQinhuangdaoHebei066004China School of Environmental and Chemical Engineering Yanshan UniversityQinhuangdaoHebei066004China Institute of Solid State Physics Vienna University of TechnologyWiedner Hauptstr.8-101040ViennaAustria Department of Mechanical and Materials Engineering University of Western Ontario1151 Richmond StLondonOntarioN6A 3K7Canada

Solution-synthesis method is attractive for solid electrolytes because it is a facile and scalable process to be used to permeate electrodes and to construct a thin electrolyte coating layer on active *** this work,we report Cl-doped Na_(3)SbS_(4) prepared via aqueous-solution *** decent ionic conductivity,the aqueous-solution approached electrolyte demonstrates an improved interfacial stability toward Na metal compared to the solid-state sintered one because of the residual hydrate,nanosized microstructure,and Cl ***-solid-state batteries using the solution-prepared electrolytes have enhanced cycling performance,though the performance still needs to be further improved.

关键词： Interfacial stability Sulfides solid electrolytes Chemical synthesis All-solid-state sodium battery

A review of flexible perovskite oxide ferroelectric films and their application

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Journal of Materiomics 2020年第1期6卷 1-16页

作者： Wenxiu Gao Yi Zhu Yaojin Wang Guoliang Yuan Jun-Ming Liu School of Materials Science and Engineering Nanjing University of Science and TechnologyNanjing210094China Laboratory of Solid State Microstructure and Innovation Center of Advanced Microstructures Nanjing UniversityNanjing210093China

Many perovskite oxide ferroelectrics(***_(1-x)Ti_(x)O_(3),BaTiO_(3),LiNbO_(3))are born with multitudinous robust performances and have been widely used in sensors,actuators,surface acoustic wave devices,and memories et ***,their hardness,brittleness and harsh synthesis conditions(*** temperature and oxygen ambience)restrain their application into flexible electronic devices which are significant components among the three pillars of modern society development,***,information and *** we review the preparation of flexible devices based on these oxide ferroelectrics,including transferring these freestanding films to flexible substrates after separating ferroelectric oxide films from the hard substrates,such as Si and SrTiO_(3) crystals,and also direct fabrication methods without transferring ***,we summarize three kinds of representative flexible devices,*** ferroelectric memories,sensors and *** inorganic electronics not only show excellent electric properties competitive with those corresponding electronics on hard substrates but also exhibit good flexibility similar to many organic flexible electronics.

关键词： Perovskite oxides Flexible devices Sensors Energy harvesters Memories

Flexoelectricity-stabilized ferroelectric phase with enhanced reliability in ultrathin La:HfO2 films

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arXiv 2023年

作者： Jiao, Peijie Cheng, Hao Li, Jiayi Chen, Hongying Liu, Zhiyu Xi, Zhongnan Ding, Wenjuan Ma, Xingyue Wang, Jian Zheng, Ningchong Nie, Yuefeng Deng, Yu Bellaiche, Laurent Yang, Yurong Wu, Di National Laboratory of Solid State Microstructures Department of Materials Science and Engineering Jiangsu Key Laboratory of Artificial Functional Materials Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing210093 China School of Materials Science and Intelligent Engineering Nanjing University Suzhou215163 China Physics Department Institute for Nanoscience and Engineering University of Arkansas FayettevilleAR72701 United States

Doped HfO2 thin films exhibit robust ferroelectric properties even for nanometric thicknesses, are compatible with current Si technology and thus have great potential for the revival of integrated ferroelectrics. Phase control and reliability are core issues for their applications. Here we show that, in (111)-oriented 5%La:HfO2 (HLO) epitaxial thin films deposited on (La0.3Sr0.7)(Al0.65Ta0.35)O3 substrates, the flexoelectric effect, arising from the strain gradient along the film's normal, induces a rhombohedral distortion in the otherwise Pca21 orthorhombic structure. Density functional calculations reveal that the distorted structure is indeed more stable than the pure Pca21 structure, when applying an electric field mimicking the flexoelectric field. This rhombohedral distortion greatly improves the fatigue endurance of HLO thin films by further stabilizing the metastable ferroelectric phase against the transition to the thermodynamically stable non-polar monoclinic phase during repetitive cycling. Our results demonstrate that the flexoelectric effect, though negligibly weak in bulk, is crucial to optimize the structure and properties of doped HfO2 thin films with nanometric thicknesses for integrated ferroelectric applications. Copyright © 2023, The Authors. All rights reserved.

关键词： Pulsed laser deposition

Self-injection locking dynamics with Raman actions in AlN microresonators

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arXiv 2025年

作者： Ding, Yulei Wang, Yifei Yao, Shunyu Guo, Yanan Yan, Jianchang Wang, Junxi Yang, Changxi Bao, Chengying State Key Laboratory of Precision Measurement Technology and Instruments Department of Precision Instruments Tsinghua University Beijing100084 China Center for Materials Science and Optoelectronics Engineering University of the Chinese Academy of Sciences Beijing100049 China Research and Development Center for Solid State Lighting Institute of Semiconductors Chinese Academy of Sciences Beijing100083 China

Self-injection locking (SIL) of semiconductor lasers to on-chip microcavities enables significant laser noise purification and diverse nonlinear optical actions. Realizing nonlinear SIL in new material platforms is essential for advancing photonic integrated circuits. Here, we demonstrate nonlinear SIL in AlN microcavities that generates stimulated Raman lasers (SRLs) and microcombs. We achieve SRL emission with an output power exceeding 10 mW and a fundamental linewidth below 70 Hz in the 1750 nm band. The Kerr effect further mediates stimulated emissions at the 2nd-Stokes and anti-Stokes frequencies. Multi-time-scale thermal relaxations during turnkey SIL enable GHz-level frequency sweeps of the SRL and pump. Raman actions also render a Stokes platicon microcomb state with co-emission in the pump and Stokes bands. Hybrid-integrated crystalline microresonators can be a versatile platform to investigate nonlinear photon-phonon interactions. © 2025, CC BY.

关键词： Microcavities

Activity-driven polymer knotting for macromolecular topology engineering

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arXiv 2024年

作者： Li, Jia-Xiang Wu, Song Hao, Li-Li Lei, Qun-Li Ma, Yu-Qiang National Laboratory of Solid State Microstructures School of Physics Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing210093 China Jiangsu Physical Science Research Center Nanjing210093 China Hefei National Laboratory Hefei230088 China Research Institute for Biomaterials Tech Institute for Advanced Materials College of Materials Science and Engineering Nanjing Tech University Nanjing211816 China

Macromolecules can gain special properties by adopting knotted conformations, but engineering knotted macromolecules is a challenging task. Here we surprisingly find that knots can be efficiently generated in active polymer systems. When one end of an actively reptative polymer is anchored, it undergoes continual self-knotting as a result of intermittent giant conformation fluctuations and the outward reptative motion. Once a knot is formed, it migrates to the anchoring point due to a non-equilibrium ratchet effect. Moreover, when the active polymer is grafted on a passive polymer, it can function as a self-propelling soft needle to either transfer its own knots or directly braid knots on the passive polymer. We further show that these active needles can create inter-molecular bridging knots between two passive polymers. Our finding highlights the non-equilibrium effects in modifying the dynamic pathways of polymer systems, which have potential applications in macromolecular topology engineering. Copyright © 2024, The Authors. All rights reserved.

关键词： Needles

Robust Weak Topological Insulator in the Bismuth Halide Bi4Br2I2

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Physical Review Letters 2024年第8期133卷 086602页

作者： Ryo Noguchi Masaru Kobayashi Kaishu Kawaguchi Wataru Yamamori Kohei Aido Chun Lin Hiroaki Tanaka Kenta Kuroda Ayumi Harasawa Viktor Kandyba Mattia Cattelan Alexei Barinov Makoto Hashimoto Donghui Lu Masayuki Ochi Takao Sasagawa Takeshi Kondo Institute for Solid State Physics (ISSP) Laboratory for Materials and Structures International Institute for Sustainability with Knotted Chiral Meta Matter (WPI-SKCM Graduate School of Advanced Science and Engineering S.S.14 163.5 km Basovizza Trieste Italy SLAC National Accelerator Laboratory 2575 Sand Hill Road Menlo Park California 94025 USA Department of Physics Forefront Research Center Research Center for Autonomous Systems Materialogy Trans-scale Quantum Science Institute

We apply a topological material design concept for selecting a bulk topology of 3D crystals by different van der Waals stackings of 2D topological insulator layers, and find a bismuth halide Bi4Br2I2 to be an ideal weak topological insulator (WTI) with the largest band gap (∼300 meV) among all the WTI candidates, by means of angle-resolved photoemission spectroscopy (ARPES), density functional theory (DFT) calculations, and resistivity measurements. Furthermore, we reveal that the topological surface state of a WTI is not “weak” but rather robust against external perturbations against the initial theoretical prediction by performing potassium deposition experiments. Our results vastly expand future opportunities for fundamental research and device applications with a robust WTI.

关键词： Electronic structure Topological insulators Angle-resolved photoemission spectroscopy

Efficient orbital torque in polycrystalline ferromagnetic−metal/Ru/Al2O3 stacks: Theory and experiment

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Physical Review B 2022年第10期105卷 104434-104434页

作者： Liyang Liao Fenghua Xue Lei Han Junyeon Kim Ruiqi Zhang Lun Li Jiuming Liu Xufeng Kou Cheng Song Feng Pan YoshiChika Otani Institute for Solid State Physics University of Tokyo Kashiwa 277-8581 Japan School of Information Science and Technology ShanghaiTech University Shanghai 201210 China Key Laboratory of Advanced Materials (MOE) School of Materials Science and Engineering Tsinghua University Beijing 100084 China Center for Emergent Matter Science RIKEN Wako Saitama 351-0198 Japan

Recently emergent current-induced orbital torque is considered more effective for magnetization switching than the well-established spin-orbit torque. However, long-range orbital transport in polycrystalline films and the theory on orbital transport in polycrystalline heterostructures remain elusive. Here we report a large torque effect in CoFeB/Ru/Al2O3 polycrystalline stacks. The unfilled d-shell and small spin-orbit coupling in Ru provide an ideal platform for orbital generation and transport. The orbital current from the Ru/Al2O3 interface can go through a thick Ru layer, with a peak value at 7-nm-thick Ru, and then induces a strong torque effect in CoFeB. The torque efficiency increases unprecedentedly with increasing CoFeB layer thickness, leveling off at ∼0.3 for 12-nm-thick CoFeB. Theoretical analysis shows that the orbital transport in polycrystalline materials exhibits a unique random precession behavior, leading to a more efficient orbital transport than that in single crystals. Besides the fundamental significance, our findings advance the development of practical orbital torque devices.

关键词： Magnetotransport Spintronics Ferromagnets