物理与天体物理最新文献

White Dwarf envelops and temperature corrections in exponential f(T) gravity

IF 2.8 4区物理与天体物理

General Relativity and Gravitation Pub Date : 2024-12-24 DOI: 10.1007/s10714-024-03341-6

Gabriel Farrugia, Carlos Gafa’, Jackson Levi Said

引用次数: 0

Exploring perturbative constraints in higher-order curvature gravity theories

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2024-12-24 DOI: 10.1088/1361-6382/ad9ce1

Daniel Molano and Pedro Bargueño

引用次数: 0

Thermal enhancement of defect motion for optimizing periodic poling of x-cut thin-film lithium niobate

IF 4 2区物理与天体物理

Applied Physics Letters Pub Date : 2024-12-24 DOI: 10.1063/5.0234913

Sagar P. Doshi, Gavin N. West, Dodd Gray, Rajeev J. Ram

{"title":"Thermal enhancement of defect motion for optimizing periodic poling of x-cut thin-film lithium niobate","authors":"Sagar P. Doshi, Gavin N. West, Dodd Gray, Rajeev J. Ram","doi":"10.1063/5.0234913","DOIUrl":"https://doi.org/10.1063/5.0234913","url":null,"abstract":"Patterning of stable, spatially tailored ferroelectric domains in thin-film lithium niobate enables efficient nonlinear optical interactions through quasi-phase matching. The engineering of domain structure is limited by the uncontrolled distribution of defects, which disrupt domain wall motion. Here, we fabricate quasi-phase matching gratings in thin-film lithium niobate with sub 20 nm of period variation. We demonstrate that annealing processed samples at 350 or 500 °C for 48 h, prior to E-field poling, can dramatically reduce the duty cycle variation. We show that maintaining an elevated temperature of 200 °C during poling enhances defect mobility, which leads to more rectangular inverted domains. Moreover, poling at elevated temperatures also increases inversion depth without sacrificing the periodic domain pattern's accuracy or precision. Elevating the temperature prior to and during poling resulted in near-ideal square wave patterning of ferroelectric domains (50% mean duty cycle, sub 10% domain width variation, and 100% depth inversion). This enables effective quasi-phase matching for second harmonic generation in 5.6 mm-long waveguides fabricated from MgO-doped x-cut thin-film lithium niobate.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"20 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2024-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142879715","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Saturation and Recurrence of Quantum Complexity in Random Local Quantum Dynamics

IF 12.5 1区物理与天体物理

Physical Review X Pub Date : 2024-12-24 DOI: 10.1103/physrevx.14.041068

Michał Oszmaniec, Marcin Kotowski, Michał Horodecki, Nicholas Hunter-Jones

{"title":"Saturation and Recurrence of Quantum Complexity in Random Local Quantum Dynamics","authors":"Michał Oszmaniec, Marcin Kotowski, Michał Horodecki, Nicholas Hunter-Jones","doi":"10.1103/physrevx.14.041068","DOIUrl":"https://doi.org/10.1103/physrevx.14.041068","url":null,"abstract":"Quantum complexity is a measure of the minimal number of elementary operations required to approximately prepare a given state or unitary channel. Recently, this concept has found applications beyond quantum computing—in studying the dynamics of quantum many-body systems and the long-time properties of anti–de Sitter black holes. In this context, Brown and Susskind [] conjectured that the complexity of a chaotic quantum system grows linearly in time up to times exponential in the system size, saturating at a maximal value, and remaining maximally complex until undergoing recurrences at doubly exponential times. In this work, we prove the saturation and recurrence of complexity in two models of chaotic time evolutions based on (i) random local quantum circuits and (ii) stochastic local Hamiltonian evolution. Our results advance an understanding of the long-time behavior of chaotic quantum systems and could shed light on the physics of black-hole interiors. From a technical perspective, our results are based on establishing new quantitative connections between the Haar measure and high-degree approximate designs, as well as the fact that random quantum circuits of sufficiently high depth converge to approximate designs. Published by the American Physical Society 2024 ","PeriodicalId":20161,"journal":{"name":"Physical Review X","volume":"98 1","pages":""},"PeriodicalIF":12.5,"publicationDate":"2024-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142879744","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

P-type electrical transport properties and excellent Hall mobility of GaSb single crystal grown by Ga flux

IF 4 2区物理与天体物理

Applied Physics Letters Pub Date : 2024-12-24 DOI: 10.1063/5.0232499

Yu Zhao, Yongqiang Pan, Li Chen, Ming Cheng, Lanxin Liu, Lei Zhang, Ranran Zhang, Xiaoguang Zhu, Wenhai Song, Xuan Luo, Yuping Sun

{"title":"P-type electrical transport properties and excellent Hall mobility of GaSb single crystal grown by Ga flux","authors":"Yu Zhao, Yongqiang Pan, Li Chen, Ming Cheng, Lanxin Liu, Lei Zhang, Ranran Zhang, Xiaoguang Zhu, Wenhai Song, Xuan Luo, Yuping Sun","doi":"10.1063/5.0232499","DOIUrl":"https://doi.org/10.1063/5.0232499","url":null,"abstract":"Semiconductor materials, especial the Gallium antimonide (GaSb), have many unique properties and potential application, which attracted significant research interest. However, GaSb single crystal always shows a lower mobility due to the intrinsic defects, which greatly limits its application in electronic and optoelectronic devices. Here, GaSb single crystal has been grown by the Ga as the self-flux method. The properties of temperature dependent structure and surface morphology have been systematically investigated. The temperature dependent vibration modes of longitudinal optical and transverse optical were studied with Raman spectra. The thermal conductivity and thermoelectric measurements were on GaSb single crystal. The thermoelectric results revealed the Seebeck coefficient (S) is 552 μV/K at 300 K, which is conducive to thermoelectric property. The electrical resistivity and Hall coefficient display semiconducting behaviors with energy gaps of 34.5 and 29.2 meV, respectively. In particular, the Hall mobility reaches 1066 cm2/V·s at 300 K, which is superior than most of the GaSb single crystals grown by other methods. The mechanism of high Hall mobility related to the native defect concentration and dislocation density on the GaSb single crystal was discussed.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"2 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2024-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142879717","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

InGaN-based blue and red micro-LEDs: Impact of carrier localization

IF 15 1区物理与天体物理

Applied physics reviews Pub Date : 2024-12-24 DOI: 10.1063/5.0195261

Jeong-Hwan Park, Markus Pristovsek, Dong-Pyo Han, Bumjoon Kim, Soo Min Lee, Drew Hanser, Pritesh Parikh, Wentao Cai, Jong-In Shim, Dong-Seon Lee, Tae-Yeon Seong, Hiroshi Amano

引用次数: 0

Experimental design for testing local Lorentz invariance violation in gravity

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2024-12-24 DOI: 10.1088/1361-6382/ad9c0c

Jia-Rui Li, Yu-Jie Tan, Tao Jin, Wei-Sheng Huang, Hao Huang, Cheng-Gang Qin and Cheng-Gang Shao

引用次数: 0

Relativistic Covariance of Scattering

IF 1.3 4区物理与天体物理

International Journal of Theoretical Physics Pub Date : 2024-12-24 DOI: 10.1007/s10773-024-05861-y

Norbert Dragon

{"title":"Relativistic Covariance of Scattering","authors":"Norbert Dragon","doi":"10.1007/s10773-024-05861-y","DOIUrl":"10.1007/s10773-024-05861-y","url":null,"abstract":"<div>Avoiding the assumption that relativistic scattering be describable by interacting fields we find in the Schrödinger picture relativistic scattering closely analogue to the non-relativistic case. On the space of scattering states the invariant mass operator (M') of the interacting time evolution has to be unitarily equivalent to the invariant mass (M= sqrt{P^2}) where P, acting on many-particle states, is the sum of the one-particle four-momenta. For an observer at rest (P^0) generates the free time evolution. Poincaré symmetry requires the interacting Hamiltonian (H') to Lorentz transform as 0-component of a four-vector and to commute with the four-velocity (U= P / M ) but not with P, else there is no scattering. Even though (H') does not commute with P, the scattering matrix does. The four-velocity U generates translations of states as they are seen by shifted observers. Superpositions of nearly mass degenerate particles such as a (K_{text {long}}) are seen by an inversely shifted observer as a shifted (K_{text {long}}) with an unchanged relative phase. In contrast, the four-momentum P generates oscillated superpositions e.g. a shifted (K_{text {short}}) with a changed relative phase. The probability of scattering of massive particles is shown to be approximately proportional to the spacetime overlap of their position wave functions. This is basic to macroscopic locality and justifies to represent the machinery of actual scattering experiments by the vacuum. In suitable variables the relativistic Hamiltonian of many-particle states is not the sum of a Hamiltonian for the motion of the center and a commuting Hamiltonian for the relative motion but factorizes as their product. They act on different variables of the wave functions.</div>","PeriodicalId":597,"journal":{"name":"International Journal of Theoretical Physics","volume":"63 12","pages":""},"PeriodicalIF":1.3,"publicationDate":"2024-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10773-024-05861-y.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142875273","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Metric symmetry by design in general relativity

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2024-12-24 DOI: 10.1088/1361-6382/ad9f15

Viktor T Toth

引用次数: 0

Plasmon-enhanced photo/electrocatalysis: Harnessing hetero-nanostructures for sustainable energy and environmental applications

IF 15 1区物理与天体物理

Applied physics reviews Pub Date : 2024-12-24 DOI: 10.1063/5.0205461

Lemma Teshome Tufa, Birhanu Bayissa Gicha, Cheru Fekadu Molla, Huu-Quang Nguyen, Van Tan Tran, Njemuwa Nwaji, Xiaojun Hu, Hongxia Chen, Jaebeom Lee

{"title":"Plasmon-enhanced photo/electrocatalysis: Harnessing hetero-nanostructures for sustainable energy and environmental applications","authors":"Lemma Teshome Tufa, Birhanu Bayissa Gicha, Cheru Fekadu Molla, Huu-Quang Nguyen, Van Tan Tran, Njemuwa Nwaji, Xiaojun Hu, Hongxia Chen, Jaebeom Lee","doi":"10.1063/5.0205461","DOIUrl":"https://doi.org/10.1063/5.0205461","url":null,"abstract":"Plasmon-enhanced photo/electrocatalysis using hetero-nanostructures has emerged as a promising approach for boosting the efficiency and selectivity of photo/electrocatalytic reactions. Plasmonic nanostructures (PNSs), with their unique properties including localized surface plasmon resonance (LSPR), play a vital role in enhancing photo/electrocatalytic activities. By leveraging LSPR, PNSs can concentrate incident light, facilitate charge separation, and induce surface reactions, leading to improved catalytic performance. In this review, we provide a comprehensive analysis of the current state of knowledge in this field. We discuss the rational design and synthesis of hetero-nanostructures, focusing on the optimization of composition, size, shape, and interface properties. Furthermore, we explore various combinations of plasmonic sources with semiconductors of diverse morphologies to achieve enhanced photocatalytic activity. The reviewed research encompasses applications in water splitting, removal of organic pollutants, CO2 reduction, and energy conversion. We also address the challenges that need to be overcome, including optimization of materials, reproducibility, stability, band alignment, and understanding plasmon–material interactions in hetero-nanostructures. The review of future perspectives includes the integration of multiple functionalities, the exploration of novel plasmonic materials, and the translation of plasmon-enhanced photo/electrocatalysis into practical applications. The combination of plasmonics and nanotechnology can be used to advance green technologies and address pressing global issues.","PeriodicalId":8200,"journal":{"name":"Applied physics reviews","volume":"149 1","pages":""},"PeriodicalIF":15.0,"publicationDate":"2024-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142879743","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0