Physical Review Applied最新文献

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Spin-wave reservoir chips with short-term memory for high-speed estimation of external magnetic fields 用于高速估算外部磁场的带短时记忆的自旋波水库芯片
IF 4.6 2区 物理与天体物理
Physical Review Applied Pub Date : 2024-08-29 DOI: 10.1103/physrevapplied.22.024072
Sho Nagase, Shoki Nezu, Koji Sekiguchi
{"title":"Spin-wave reservoir chips with short-term memory for high-speed estimation of external magnetic fields","authors":"Sho Nagase, Shoki Nezu, Koji Sekiguchi","doi":"10.1103/physrevapplied.22.024072","DOIUrl":"https://doi.org/10.1103/physrevapplied.22.024072","url":null,"abstract":"The experimental realization of a spin-wave reservoir chip employing ferromagnetic permalloy thin films is presented. The novel device facilitates the interference of three spherical wave-excited surface mode spin waves within a rectangular waveguide via strategically positioned slits, enabling the detection of electrical signals from surface mode spin waves across all four observation antennas. Through the experiments conducted, it is confirmed that the device functions as a one-input, four-output reservoir capable of estimating external magnetic fields. Notably, the results demonstrate the device’s capacity to retain memory up to one step prior in short-term memory tasks, while confirming the effectiveness of spin-wave interference induced by Huygens slits in enhancing nonlinearity, as observed in parity-check tasks. Furthermore, the inclusion of additional detection antennas contributes to improved learning accuracy, highlighting the significant progress achieved by the spin-wave reservoir chip. These findings underscore substantial progress toward practical implementation, with promising avenues for further development and refinement, showing its remarkable ability to process signals at high speeds, even with 0.8-ns pulse sequences.","PeriodicalId":20109,"journal":{"name":"Physical Review Applied","volume":"24 1","pages":""},"PeriodicalIF":4.6,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142224163","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
Microwave-to-optical quantum transduction utilizing the topological Faraday effect of topological-insulator heterostructures 利用拓扑绝缘体异质结构的拓扑法拉第效应实现微波到光量子转换
IF 4.6 2区 物理与天体物理
Physical Review Applied Pub Date : 2024-08-29 DOI: 10.1103/physrevapplied.22.024071
Akihiko Sekine, Mari Ohfuchi, Yoshiyasu Doi
{"title":"Microwave-to-optical quantum transduction utilizing the topological Faraday effect of topological-insulator heterostructures","authors":"Akihiko Sekine, Mari Ohfuchi, Yoshiyasu Doi","doi":"10.1103/physrevapplied.22.024071","DOIUrl":"https://doi.org/10.1103/physrevapplied.22.024071","url":null,"abstract":"The quantum transduction between microwave and optical photons is essential for realizing scalable quantum computers with superconducting qubits. Due to the large frequency difference between microwave and optical ranges, the transduction needs to be done via intermediate bosonic modes or nonlinear processes. So far, the transduction efficiency <math display=\"inline\" overflow=\"scroll\" xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>η</mi></math> via the magneto-optic Faraday effect (i.e., the light-magnon interaction) in the ferromagnet YIG has been demonstrated to be as small as <math display=\"inline\" overflow=\"scroll\" xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>η</mi><mo>∼</mo><msup><mn>10</mn><mrow><mo>−</mo><mn>8</mn></mrow></msup><mo>−</mo><msup><mn>10</mn><mrow><mo>−</mo><mn>15</mn></mrow></msup></math> due to the weak magneto-optic coupling. Here, we take advantage of the fact that three-dimensional topological insulator thin films exhibit a topological Faraday effect that is independent of the sample thickness in the terahertz regime. This leads to a large Faraday rotation angle and therefore enhanced light-magnon interaction in the thin-film limit. We show theoretically that the transduction efficiency between microwave and terahertz photons can be greatly improved to <math display=\"inline\" overflow=\"scroll\" xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>η</mi><mo>∼</mo><msup><mn>10</mn><mrow><mo>−</mo><mn>4</mn></mrow></msup></math> by utilizing the heterostructures consisting of topological insulator thin films, such as <math display=\"inline\" overflow=\"scroll\" xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>Bi</mi><mn>2</mn></msub><msub><mi>Se</mi><mn>3</mn></msub></math> and ferromagnetic insulator thin films, such as YIG.","PeriodicalId":20109,"journal":{"name":"Physical Review Applied","volume":"81 1","pages":""},"PeriodicalIF":4.6,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142185316","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
Multiaxis quantum noise spectroscopy robust to errors in state preparation and measurement 不受状态制备和测量误差影响的多轴量子噪声光谱学
IF 4.6 2区 物理与天体物理
Physical Review Applied Pub Date : 2024-08-29 DOI: 10.1103/physrevapplied.22.024074
Muhammad Qasim Khan, Wenzheng Dong, Leigh M. Norris, Lorenza Viola
{"title":"Multiaxis quantum noise spectroscopy robust to errors in state preparation and measurement","authors":"Muhammad Qasim Khan, Wenzheng Dong, Leigh M. Norris, Lorenza Viola","doi":"10.1103/physrevapplied.22.024074","DOIUrl":"https://doi.org/10.1103/physrevapplied.22.024074","url":null,"abstract":"Characterizing temporally correlated noise and “non-Markovian” qubit dynamics is a key prerequisite for achieving noise-tailored error mitigation and optimal device performance. Quantum noise spectroscopy can provide quantitative estimation of the noise spectral features; however, in its current form it is highly vulnerable to implementation nonidealities, notably, state preparation and measurement (SPAM) errors. Further to that, existing protocols have been mostly developed for dephasing-dominated noise processes, with competing dephasing and relaxation effects being largely unaccounted for. We introduce quantum noise spectroscopy protocols inspired by spin-locking techniques that enable the characterization of arbitrary temporally correlated multiaxis noise on a qubit with fixed energy splitting, while remaining resilient to realistic static SPAM errors. By validating the performance of our protocol in both numerical simulation and on cloud-based IBM quantum processors, we demonstrate the successful separation and estimation of native noise spectrum components as well as SPAM error rates. We find that SPAM errors can significantly alter or mask important noise features, with spectra overestimated by up to 26.4% in a classical noise regime. Clear signatures of nonclassical noise are manifest in the reconstructed IBM-qubit dephasing spectra, once SPAM-error effects are compensated for. Our work provides a timely tool for benchmarking realistic sources of noise in qubit devices.","PeriodicalId":20109,"journal":{"name":"Physical Review Applied","volume":"36 1","pages":""},"PeriodicalIF":4.6,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142185244","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
Lower switching-current density in Ta/(Pt/X)n/Pt/Co/Ta (X = Ta,Mn,Cu,V,Zr, Bi; n = 3, 4) multilayers based on a domain-wall-depinning model 基于畴壁沉积模型的 Ta/(Pt/X)n/Pt/Co/Ta(X = Ta、Mn、Cu、V、Zr、Bi;n = 3、4)多层膜中较低的开关电流密度
IF 4.6 2区 物理与天体物理
Physical Review Applied Pub Date : 2024-08-29 DOI: 10.1103/physrevapplied.22.l021002
Shuanghai Wang, Kun He, Yongkang Xu, Zhuoyi Li, Jin Wang, Caitao Li, Xingze Dai, Jun Du, Yong-Lei Wang, Ronghua Liu, Xianyang Lu, Yongbing Xu, Liang He
{"title":"Lower switching-current density in Ta/(Pt/X)n/Pt/Co/Ta (X = Ta,Mn,Cu,V,Zr, Bi; n = 3, 4) multilayers based on a domain-wall-depinning model","authors":"Shuanghai Wang, Kun He, Yongkang Xu, Zhuoyi Li, Jin Wang, Caitao Li, Xingze Dai, Jun Du, Yong-Lei Wang, Ronghua Liu, Xianyang Lu, Yongbing Xu, Liang He","doi":"10.1103/physrevapplied.22.l021002","DOIUrl":"https://doi.org/10.1103/physrevapplied.22.l021002","url":null,"abstract":"In recent years, spin-orbit torque (SOT) generated by heavy metal (HM) has garnered increasing attention. However, SOT-magnetic random-access memory based on HM suffers from a low spin Hall angle and high current density. Here, we demonstrate that the critical switching-current density (<math display=\"inline\" overflow=\"scroll\" xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>I</mi><mi>c</mi></msub></math>) in a multilayer structure of <math display=\"inline\" overflow=\"scroll\" xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>Ta</mi><mo>/</mo><mo stretchy=\"false\">(</mo><mi>Pt</mi><mo>/</mo><mi>Ta</mi><msub><mo stretchy=\"false\">)</mo><mn>4</mn></msub><mo>/</mo><mi>Pt</mi><mo>/</mo><mi>Co</mi><mo>/</mo><mi>Ta</mi></math> has been reduced by 79% compared with that of <math display=\"inline\" overflow=\"scroll\" xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>Ta</mi><mo>/</mo><mi>Pt</mi><mo>/</mo><mi>Co</mi><mo>/</mo><mi>Ta</mi></math>, achieving a value of 5.88 × <math display=\"inline\" overflow=\"scroll\" xmlns=\"http://www.w3.org/1998/Math/MathML\"><msup><mn>10</mn><mn>6</mn></msup><mspace width=\"0.2em\"></mspace><mrow><mrow><mi mathvariant=\"normal\">A</mi></mrow></mrow><mo>/</mo><msup><mi>cm</mi><mn>2</mn></msup></math>. This value is considerably low among all reported values in the <math display=\"inline\" overflow=\"scroll\" xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>Pt</mi><mo>/</mo><mi>Co</mi></math> system literature. The reduction of <math display=\"inline\" overflow=\"scroll\" xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>I</mi><mi>c</mi></msub></math> is accompanied by enhanced dampinglike torque efficiency (<math display=\"inline\" overflow=\"scroll\" xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>β</mi><mi>D</mi></msub></math>) and reduced coercive force (<math display=\"inline\" overflow=\"scroll\" xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mi>c</mi></msub></math>). A perfect linear correlation has been observed between <math display=\"inline\" overflow=\"scroll\" xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>I</mi><mi>c</mi></msub></math> and <math display=\"inline\" overflow=\"scroll\" xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>H</mi><mi>c</mi></msub></math>/<math display=\"inline\" overflow=\"scroll\" xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>β</mi><mi>D</mi></msub></math>, which supports the domain-wall depinning model of the SOT-induced magnetization reversal in this system. Crucially, this linearity extends to several metal dopants possessing the identical superlattice structure. This research offers insights into the future of low-power, high-density magnetic memory technology based on HM materials.","PeriodicalId":20109,"journal":{"name":"Physical Review Applied","volume":"4 1","pages":""},"PeriodicalIF":4.6,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142224164","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
Nonlocal inverse design of an ultrasonic lens for underwater manipulation of orbital angular momentum 用于水下操纵轨道角动量的超声波透镜的非局部反设计
IF 4.6 2区 物理与天体物理
Physical Review Applied Pub Date : 2024-08-28 DOI: 10.1103/physrevapplied.22.024070
Chuanxin Zhang, Fei Dai, Xue Jiang, Dean Ta
{"title":"Nonlocal inverse design of an ultrasonic lens for underwater manipulation of orbital angular momentum","authors":"Chuanxin Zhang, Fei Dai, Xue Jiang, Dean Ta","doi":"10.1103/physrevapplied.22.024070","DOIUrl":"https://doi.org/10.1103/physrevapplied.22.024070","url":null,"abstract":"Acoustic orbital angular momentum (OAM) beams hold potential for underwater communications, particle manipulation, and biomedical applications. However, adapting air-based OAM technologies to the underwater environment presents unique challenges. In the underwater environment, the medium cannot be considered acoustically soft, and commonly used ultrasound frequencies have shorter wavelengths compared with air, necessitating new design approaches. Conventional underwater ultrasonic lens design methods often rely on simplified models that neglect nonlocal interactions and diffraction within the structure, therefore leading to suboptimal performance. We introduce a novel nonlocal inverse design method by integrating the full-wave models with the nondominated sorting genetic algorithm II (NSGA-II). This approach diverges from conventional phase-based design by optimizing the physical structure of the lens to account for nonlocal interactions within the material. We experimentally demonstrate the performance when generating high-purity OAM beams underwater. Our experimental results show that this method can generate high-purity OAM beams underwater, achieving over 90% purity for the OAM beams of topological charges from <i>m</i> = 1 to <i>m</i> = 4. This is a significant improvement compared with traditional methods, which typically reach 70–89% purity. These findings highlight the practical applicability of our method for nonlocally designing the ultrasonic lens, paving the way for advancements in beam performance for various applications.","PeriodicalId":20109,"journal":{"name":"Physical Review Applied","volume":"313 1","pages":""},"PeriodicalIF":4.6,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142224165","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
Imaging symmetric and antisymmetric behavior of orbital-angular-momentum-entangled two-photon states 轨道-角动量-纠缠双光子态的对称和非对称成像行为
IF 4.6 2区 物理与天体物理
Physical Review Applied Pub Date : 2024-08-27 DOI: 10.1103/physrevapplied.22.024068
Zeferino Ibarra-Borja, Pablo Yepiz-Graciano, Nicolas Claro-Rodríguez, Alfred B. U’Ren, Roberto Ramírez-Alarcón
{"title":"Imaging symmetric and antisymmetric behavior of orbital-angular-momentum-entangled two-photon states","authors":"Zeferino Ibarra-Borja, Pablo Yepiz-Graciano, Nicolas Claro-Rodríguez, Alfred B. U’Ren, Roberto Ramírez-Alarcón","doi":"10.1103/physrevapplied.22.024068","DOIUrl":"https://doi.org/10.1103/physrevapplied.22.024068","url":null,"abstract":"We report on an experiment in which orbital-angular-momentum (OAM)-entangled photon pairs generated by the spontaneous parametric down-conversion process can be engineered to have particular symmetry properties. Our method is based on the use of a Dove-prism pair in conjunction with Hong-Ou-Mandel (HOM) interferometry resolved in transverse position and OAM. The latter allows us to engineer the postselected two-photon state to exhibit a specific type of symmetry. By selecting particular topological charge values for the pump and for the postselected two-photon state, we can transition from a symmetric two-photon state and a HOM dip to an antisymmetric state and a HOM peak. Spatial resolution allows us to obtain the HOM interferogram both at the single-pixel level and globally by summing over all sensor pixels. Furthermore, through spatially selective OAM projection of the detected photon pairs, we can define multiple transverse regions with different symmetry properties, as verified by our spatially resolved HOM apparatus. Although we used two transverse regions for this proof-of-concept demonstration, this method could in principle be scaled to a larger number of regions, leading to a new technique to be added to the existing toolbox for quantum technologies in the photonic domain.","PeriodicalId":20109,"journal":{"name":"Physical Review Applied","volume":"38 1","pages":""},"PeriodicalIF":4.6,"publicationDate":"2024-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142185317","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
Sequential-measurement thermometry with quantum many-body probes 利用量子多体探针进行顺序测量测温
IF 4.6 2区 物理与天体物理
Physical Review Applied Pub Date : 2024-08-27 DOI: 10.1103/physrevapplied.22.024069
Yaoling Yang, Victor Montenegro, Abolfazl Bayat
{"title":"Sequential-measurement thermometry with quantum many-body probes","authors":"Yaoling Yang, Victor Montenegro, Abolfazl Bayat","doi":"10.1103/physrevapplied.22.024069","DOIUrl":"https://doi.org/10.1103/physrevapplied.22.024069","url":null,"abstract":"Measuring the temperature of a quantum system is an essential task in almost all aspects of quantum technologies. Theoretically, an optimal strategy for thermometry often requires measuring energy, which demands full accessibility over the entire system as well as a complex entangled measurement basis. In this paper, we take a different approach and show that single-qubit sequential measurements in the computational basis not only allow for precise thermometry of a many-body system, but may also achieve precision beyond the thermometry capacity of the probe at equilibrium, given by the Cramér-Rao bound. Thus, using consecutive single-qubit measurements of the probe out of equilibrium is, in most cases, very beneficial, as it achieves lower-temperature uncertainties and avoids demanding energy measurements when compared with probes at thermal equilibrium. To obtain such precision, the time between the two subsequent measurements should be smaller than the thermalization time so that the probe never thermalizes. Therefore, the nonequilibrium dynamics of the system continuously imprint information about temperature in the state of the probe. To demonstrate the generality of our findings, we consider thermometry in both spin chains and the Jaynes-Cummings model.","PeriodicalId":20109,"journal":{"name":"Physical Review Applied","volume":"20 1","pages":""},"PeriodicalIF":4.6,"publicationDate":"2024-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142224166","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
Role of oxygen in laser-induced contamination at diamond-vacuum interfaces 氧气在金刚石-真空界面激光诱导污染中的作用
IF 4.6 2区 物理与天体物理
Physical Review Applied Pub Date : 2024-08-26 DOI: 10.1103/physrevapplied.22.024067
Shreyas Parthasarathy, Maxime Joos, Lillian B. Hughes, Simon A. Meynell, Taylor A. Morrison, J.D. Risner-Jamtgaard, David M. Weld, Kunal Mukherjee, Ania C. Bleszynski Jayich
{"title":"Role of oxygen in laser-induced contamination at diamond-vacuum interfaces","authors":"Shreyas Parthasarathy, Maxime Joos, Lillian B. Hughes, Simon A. Meynell, Taylor A. Morrison, J.D. Risner-Jamtgaard, David M. Weld, Kunal Mukherjee, Ania C. Bleszynski Jayich","doi":"10.1103/physrevapplied.22.024067","DOIUrl":"https://doi.org/10.1103/physrevapplied.22.024067","url":null,"abstract":"Many modern-day quantum science experiments rely on high-fidelity measurement of fluorescent signals emitted by the quantum system under study. A pernicious issue encountered when such experiments are conducted near a material interface in vacuum is “laser-induced contamination” (LIC): the gradual accretion of fluorescent contaminants on the surface where a laser is focused. Fluorescence from these contaminants can entirely drown out any signal from, e.g., optically probed color centers in the solid state. Crucially, while LIC appears often in this context, it has not been systematically studied. In this work, we probe the onset and growth rate of LIC for a diamond nitrogen-vacancy center experiment in vacuum, and we correlate the contamination-induced fluorescence intensities to micron-scale physical buildup of contaminant on the diamond surface. Drawing upon similar phenomena previously studied in the space optics community, we use photocatalyzed oxidation of contaminants as a mitigation strategy. We vary the residual oxygen pressure over 9 orders of magnitude and find that LIC growth is inhibited at near-atmospheric oxygen partial pressures, but the growth rate at lower oxygen pressure is nonmonotonic. Finally, we discuss a model for the observed dependence of LIC growth rate on oxygen content and propose methods to extend <i>in situ</i> mitigation of LIC to a wider range of operating pressures.","PeriodicalId":20109,"journal":{"name":"Physical Review Applied","volume":"60 1","pages":""},"PeriodicalIF":4.6,"publicationDate":"2024-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142224167","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
First-principles characterization of thermal conductivity in LaPO4-based alloys 基于 LaPO4 的合金导热性第一原理表征
IF 4.6 2区 物理与天体物理
Physical Review Applied Pub Date : 2024-08-26 DOI: 10.1103/physrevapplied.22.024064
Anees Pazhedath, Lorenzo Bastonero, Nicola Marzari, Michele Simoncelli
{"title":"First-principles characterization of thermal conductivity in LaPO4-based alloys","authors":"Anees Pazhedath, Lorenzo Bastonero, Nicola Marzari, Michele Simoncelli","doi":"10.1103/physrevapplied.22.024064","DOIUrl":"https://doi.org/10.1103/physrevapplied.22.024064","url":null,"abstract":"Alloys based on lanthanum phosphate (<math display=\"inline\" overflow=\"scroll\" xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mrow><mi>La</mi><mi>PO</mi></mrow><mn>4</mn></msub></math>) are often employed as thermal barrier coatings, due to their low thermal conductivity and structural stability over a wide temperature range. To enhance the thermal-insulation performance of these alloys, it is essential to comprehensively understand the fundamental physics governing their heat conduction. Here, we employ the Wigner formulation of thermal transport in conjunction with first-principles calculations to elucidate how the interplay between anharmonicity and compositional disorder determines the thermal properties of <math display=\"inline\" overflow=\"scroll\" xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>La</mi><mrow><mn>1</mn><mo>−</mo><mi>x</mi></mrow></msub><msub><mi>Gd</mi><mi>x</mi></msub><msub><mi>PO</mi><mn>4</mn></msub></math> alloys, and discuss the fundamental physics underlying the emergence and coexistence of particlelike and wavelike heat-transport mechanisms. We also show how the Wigner transport equation correctly describes the thermodynamic limit of a compositionally disordered crystal, while the Boltzmann transport equation does not. Our predictions for microscopic vibrational properties (temperature-dependent Raman spectrum) and for macroscopic thermal conductivity are validated against experiments. Finally, we leverage these findings to devise strategies to optimize the performance of thermal barrier coatings.","PeriodicalId":20109,"journal":{"name":"Physical Review Applied","volume":"24 1","pages":""},"PeriodicalIF":4.6,"publicationDate":"2024-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142185319","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
Electron-phonon scattering in two-dimensional Dirac-source transistors 二维狄拉克源晶体管中的电子-声子散射
IF 4.6 2区 物理与天体物理
Physical Review Applied Pub Date : 2024-08-26 DOI: 10.1103/physrevapplied.22.024065
Shuaishuai Yuan, Hong Guo
{"title":"Electron-phonon scattering in two-dimensional Dirac-source transistors","authors":"Shuaishuai Yuan, Hong Guo","doi":"10.1103/physrevapplied.22.024065","DOIUrl":"https://doi.org/10.1103/physrevapplied.22.024065","url":null,"abstract":"Electron-phonon (<math display=\"inline\" overflow=\"scroll\" xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>e</mi></math>-ph) scattering is a key effect in quantum transport and electronic device physics which is, however, often neglected in atomistic device simulation due to its impractical computational burden. Here we investigate <i>e</i>-ph effects in two-dimensional (2D) FETs, where the injecting source is graphene that inject “Dirac” electrons into the FET channel. Such a Dirac-source FET was experimentally known to have excellent transfer characteristics for its lower <span>off</span>-state current due to the electronic structure of the graphene. By using an approximate but computationally efficient technique (the Zacharias-Giustino method) to capture <i>e</i>-ph scattering, we quantitatively analyze to what extent <i>e</i>-ph scattering affects the operation of Dirac source, as a function of temperature. Our nonequilibrium Green’s function density-functional-theory analysis microscopically reveal the <i>e</i>-ph scattering and we make a comprehensive evaluation of it across real, momentum, and energy spaces, covering both the tunneling and thermionic emission regions. The findings suggest that <i>e</i>-ph scattering does not significantly impact the overall performance of the Dirac-source FETs. For the graphene-<math display=\"inline\" overflow=\"scroll\" xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>WSe</mi><mn>2</mn></msub></math> device, the <i>e</i>-ph effects amount to somewhat increase the <span>off</span>-state current, which is not significant as to alter the subthreshold property of the transistor. Other factors, such as gate efficiency—determined by the body factor—exhibit a more pronounced influence on device performance for this system.","PeriodicalId":20109,"journal":{"name":"Physical Review Applied","volume":"1 1","pages":""},"PeriodicalIF":4.6,"publicationDate":"2024-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142224168","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
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