Applied Physics Letters最新文献_第2页

Correlation between giant surface potential and enthalpy relaxation in vacuum-deposited organic films 真空沉积有机薄膜中巨表面电位与焓弛豫的关系

IF 4 2区物理与天体物理

Applied Physics Letters Pub Date : 2026-04-14 DOI: 10.1063/5.0322473

Tsuyoshi Tsujioka, Hiroyuki Kawashima, Kenji Koike, Naoki Matsumoto, Yohei Ono, Junwei Shen, Shinichiro Nakamura

{"title":"Correlation between giant surface potential and enthalpy relaxation in vacuum-deposited organic films","authors":"Tsuyoshi Tsujioka, Hiroyuki Kawashima, Kenji Koike, Naoki Matsumoto, Yohei Ono, Junwei Shen, Shinichiro Nakamura","doi":"10.1063/5.0322473","DOIUrl":"https://doi.org/10.1063/5.0322473","url":null,"abstract":"It is well known that vacuum deposition of organic molecules possessing electric dipoles leads to spontaneous molecular orientation, resulting in the formation of a giant surface potential (GSP). The GSP is expected to be useful for energy-harvesting devices, and improving carrier injection in organic light-emitting diodes; therefore, maximizing the GSP is crucial for device performance. Here, we systematically investigate the factors governing GSP formation by examining the roles of glass transition temperature (Tg), substrate temperature (Tsub), and deposition rate using a series of organic materials, including adamantane derivatives, diarylethenes, and spiropyrans. The molecular orientation parameter ⟨cosθ⟩ exhibits a clear dependence on Tg, indicating that surface molecular dynamics during deposition play a dominant role. We demonstrate that the GSP slope is maximized when Tsub is maintained at approximately 0.8–0.85 Tg. This condition coincides with the maximum enthalpy relaxation of vapor-deposited organic glasses. Based on these results, we propose a three-regime model describing GSP generation as a function of surface molecular mobility (Tsub/Tg scaling), providing practical guidelines for maximizing GSP in vapor-deposited organic thin films.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"1 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147681617","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

Multi-strategy cooperative optimization of thermoelectric performance in higher manganese silicide-based materials 高硅化锰基材料热电性能的多策略协同优化

IF 4 2区物理与天体物理

Applied Physics Letters Pub Date : 2026-04-14 DOI: 10.1063/5.0326471

Guangxu Zhang, Jingxian Wang, Jiaqi Dong, Qinglai Zhai, Qian Cao, Zhihai Ding, Shufang Wang, Jianglong Wang, Zhiliang Li

{"title":"Multi-strategy cooperative optimization of thermoelectric performance in higher manganese silicide-based materials","authors":"Guangxu Zhang, Jingxian Wang, Jiaqi Dong, Qinglai Zhai, Qian Cao, Zhihai Ding, Shufang Wang, Jianglong Wang, Zhiliang Li","doi":"10.1063/5.0326471","DOIUrl":"https://doi.org/10.1063/5.0326471","url":null,"abstract":"Higher manganese silicide (HMS), a naturally abundant p-type thermoelectric (TE) material, exhibits an eco-friendly profile, low production cost, superior mechanical strength, and high thermal stability. Current strategies for enhancing the TE performance of HMSs focus on optimizing dopants for anionic/cationic substitution and nanocomposite engineering. Nevertheless, the cost-prohibitive nature of requisite dopants and nanocomponents, coupled with intricate synthesis routes, impedes their practical deployment. In this study, V-Al-co-doped HMS bulk specimens incorporated with CrSi2 are consolidated by spark plasma sintering following wet ball milling. This strategy employs dual-site doping, with V substituting at cationic Mn sites and Al at anionic Si sites to achieve acceptor doping, thereby increasing the hole concentration. Concurrently, CrSi2 nanoparticle incorporation enhances phonon scattering at grain boundaries, significantly suppressing lattice thermal conductivity (κl). Furthermore, both V and Cr interact with Mn, respectively, forming resonant states near the Fermi level and ultimately resulting in overlapping of the energy levels. At 823 K, the (Mn0.985V0.015) (Si0.99Al0.01)1.79 + 20% CrSi2 composite achieved a peak zT value of 0.72, a 71.4% enhancement over the pristine MnSi1.79 matrix. Consequently, synergistic cation–anion site engineering coupled with nanostructured composite design provides an effective strategy for enhancing the TE performance of HMSs, leveraging defect-mediated carrier optimization and phonon scattering intensification.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"5 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147681563","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

Epitaxial growth of topological insulator β -Ag2Te thin films 拓扑绝缘体β -Ag2Te薄膜的外延生长

IF 4 2区物理与天体物理

Applied Physics Letters Pub Date : 2026-04-14 DOI: 10.1063/5.0310066

Ayuki Takegawa, Kouya Imoto, Minoru Kawamura, Moeta Tsukamoto, Ryutaro Yoshimi

引用次数: 0

Monolayer WSe2 films synthesized by confined-space chemical vapor deposition 密闭空间化学气相沉积法制备单层WSe2薄膜

IF 4 2区物理与天体物理

Applied Physics Letters Pub Date : 2026-04-14 DOI: 10.1063/5.0327324

Haihang Sun, Xinyao Liu, Yuhan Zhu, Zhengqiao Li, Junchi Song, Yichen Zhang, Xiaolin Liu, Feng Wang, Jia Lin, Xueying Zhan, Zhenxing Wang

引用次数: 0

Simulation study of low-field proton magnetic resonance spectroscopy using optically pumped magnetometers 光抽运磁强计的低场质子磁共振波谱模拟研究

IF 4 2区物理与天体物理

Applied Physics Letters Pub Date : 2026-04-14 DOI: 10.1063/5.0322432

Ryo Enari, Hiroyuki Ueda, Kazuyoshi Yoshii, Yosuke Ito

{"title":"Simulation study of low-field proton magnetic resonance spectroscopy using optically pumped magnetometers","authors":"Ryo Enari, Hiroyuki Ueda, Kazuyoshi Yoshii, Yosuke Ito","doi":"10.1063/5.0322432","DOIUrl":"https://doi.org/10.1063/5.0322432","url":null,"abstract":"We numerically investigated the feasibility of low-field magnetic resonance spectroscopy (MRS) using optically pumped magnetometers (OPMs). Low magnetic fields reduce signal strength and spectral resolution, challenging reliable metabolite quantification. To address these issues, we performed Bloch-equation–based simulations at 0.01–7 T using aqueous phantoms. We compared chemical shift selective and inversion recovery (IR) methods for water suppression. We also evaluated signal detection using both radio frequency coils and OPMs. The IR method, relying on T1 contrast rather than frequency selectivity, effectively suppressed water signals down to 0.1 T. The signal-to-noise ratio (SNR) of Glu increased below 0.7 T. OPMs maintained nearly constant SNR across 0.01–1 T and outperformed coils below 1 T. In mixed-metabolite settings, however, spectral overlap and IR-induced co-suppression impaired detection—particularly for Gln below 0.1 T. These results show that IR and OPMs offer complementary advantages for low-field MRS, while spectral resolution remains a challenge. This work provides a theoretical basis for enhancing low-field MRS techniques and expanding access to metabolic diagnostics in clinical and research settings.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"19 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147681564","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

Retention improvement in vertical NAND flash memory using block soft erase scheme 利用块软擦除方案改善垂直NAND快闪记忆体的保留率

IF 4 2区物理与天体物理

Applied Physics Letters Pub Date : 2026-04-14 DOI: 10.1063/5.0310928

Sung-Ho Park, Dongbeen Shin, Mingyun Oh, Yeongheon Yang, Gyuweon Jung, Jong-Ho Lee

引用次数: 0

A light-switchable polarity retina-inspired phototransistor for adaptive photo-sensing 一种用于自适应光传感的可调极性视网膜光电晶体管

IF 4 2区物理与天体物理

Applied Physics Letters Pub Date : 2026-04-14 DOI: 10.1063/5.0327608

Mengyao Zhang, Yifei Hu, Ying Wang, Leiming Yu, Suicai Zhang, Xiaohui Song, Junna Zhang, Yurong Jiang, Congxin Xia

引用次数: 0

Flexoelectric-stabilized hierarchical polar bubbles in wrinkled ferroelectric CuInP2S6 皱化铁电CuInP2S6的挠性电稳定分层极性泡

IF 4 2区物理与天体物理

Applied Physics Letters Pub Date : 2026-04-14 DOI: 10.1063/5.0326857

Di Fan, Yonglan Hou, Tongfei Zhang, Hong Zhou, Qianyi Li, Yi Zhang, Congbing Tan

{"title":"Flexoelectric-stabilized hierarchical polar bubbles in wrinkled ferroelectric CuInP2S6","authors":"Di Fan, Yonglan Hou, Tongfei Zhang, Hong Zhou, Qianyi Li, Yi Zhang, Congbing Tan","doi":"10.1063/5.0326857","DOIUrl":"https://doi.org/10.1063/5.0326857","url":null,"abstract":"The realization of complex, high-order topological textures in ferroelectrics typically relies on demanding epitaxial growth under substrate clamping. Here, we report hierarchical polar bubbles in the van der Waals ferroelectric CuInP2S6, enabled by a facile wrinkle-induced strain-engineering strategy. Vector piezoresponse force microscopy reveals that localized wrinkled bulges generate large strain gradients, which activate a flexoelectric-assisted polarization reversal and form a macroscopic polar envelope. This macro-bubble encapsulates pre-existing intrinsic ferroelectric nanodomains, resulting in a distinctive nested bubble-in-a-bubble hierarchical architecture. Statistical analysis indicates that the formation probability decreases with increasing flake thickness, providing strong evidence for a strain-gradient-dominated flexoelectric origin. Real-time in situ manipulation demonstrates the mechanical recoverability of these hierarchical states under external loading. This work introduces a novel form of ferroelectric topology and establishes a mechanical pathway for designing resilient functional elements for next-generation straintronic devices.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"6 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147682038","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

Non-pinched hysteresis in CrO x /TiO y -based memristive devices: Modeling and analysis 基于CrO /TiO的记忆器件的非挤压迟滞：建模与分析

IF 4 2区物理与天体物理

Applied Physics Letters Pub Date : 2026-04-14 DOI: 10.1063/5.0332014

Phu-Quan Pham, Ngoc-Lam Pham Le, Thuy-Anh Tran, Van-Son Dang, Quang Nguyen, Ngoc Kim Pham, Thuat Nguyen-Tran

{"title":"Non-pinched hysteresis in CrO x /TiO y -based memristive devices: Modeling and analysis","authors":"Phu-Quan Pham, Ngoc-Lam Pham Le, Thuy-Anh Tran, Van-Son Dang, Quang Nguyen, Ngoc Kim Pham, Thuat Nguyen-Tran","doi":"10.1063/5.0332014","DOIUrl":"https://doi.org/10.1063/5.0332014","url":null,"abstract":"Transition-metal oxide memristors are promising for neuromorphic computing, yet most SPICE models overlook material-specific effects such as oxygen stoichiometry and non-pinched hysteresis. Here, we systematically study CrOx/TiOy memristors fabricated under controlled oxygen concentrations (10%–50%) and propose an improved SPICE-compatible model. The devices exhibit oxygen-dependent resistive switching, retention, and pulse-driven plasticity, with optimal performance at 40% oxygen. Our model explicitly reproduces the non-pinched hysteresis observed in I–V curves, consistent with behaviors such as ion immigration, charge trapping, and remnant polarization, and achieves close agreement with experiments across multiple stoichiometries. Validation includes endurance, retention, and synaptic functions such as long-term potentiation/depression and spike-number/amplitude-dependent plasticity. Finally, the model is extended from single devices to a 4 × 4 crossbar array, demonstrating its scalability for artificial neural network simulations. These results emphasize the critical role of oxygen stoichiometry in CrOx/TiOy memristors and introduce a modeling framework that bridges experimental device physics with circuit-level neuromorphic applications.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"24 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147681620","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

Effective modulation of emission dynamics in Er:CaF2 crystal via oxygen anion engineering 氧阴离子工程对Er:CaF2晶体发射动力学的有效调制

IF 4 2区物理与天体物理

Applied Physics Letters Pub Date : 2026-04-14 DOI: 10.1063/5.0326861

Fan Zhang, Wentao Hou, Youchenchen Zhou, Qingguo Wang, Chenbo Zhang, Bo Liu, Xiaodong Xu, Huili Tang, Wudi Wang, Jun Xu

引用次数: 0