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Structural modulation of bilayer graphene under an external electric field and carrier doping 外电场和载流子掺杂下双层石墨烯的结构调制
IF 2.3 4区 物理与天体物理 Q3 PHYSICS, APPLIED Pub Date : 2024-03-15 DOI: 10.35848/1882-0786/ad2ecc
Nadia Sultana, Yanlin Gao, Mina Maruyama and Susumu Okada
Density functional theory was used to investigate the geometric structure of bilayer graphene under an external electric field with carrier doping. Our calculations revealed the crucial impact of external electric fields and the hole injection on determining the geometric structure of bilayer graphene. The bond length of graphene monotonically increased when increasing the hole doping concentration, while it remained insensitive to electron doping. Additionally, there accumulated carriers predominantly distributed in the outermost layer located just below the gate electrode. These results enabled the construction of moiré superlattices in the bilayer graphene, possessing different moiré periodicity depending on the carrier concentration.
我们利用密度泛函理论研究了外电场和载流子掺杂作用下双层石墨烯的几何结构。我们的计算揭示了外电场和空穴注入对决定双层石墨烯几何结构的关键影响。当增加空穴掺杂浓度时,石墨烯的键长单调增加,而它对电子掺杂仍然不敏感。此外,积累的载流子主要分布在栅极下方的最外层。这些结果使我们能够在双层石墨烯中构建摩尔纹超晶格,并根据载流子浓度的不同而具有不同的摩尔纹周期性。
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引用次数: 0
Field-free magnetization switching with full scale in Pt/Tm3Fe5O12 bilayer on vicinal substrate 在沧桑基底上的 Pt/Tm3Fe5O12 双层中实现全量程无磁场磁化切换
IF 2.3 4区 物理与天体物理 Q3 PHYSICS, APPLIED Pub Date : 2024-03-15 DOI: 10.35848/1882-0786/ad2d74
Tianhui Li, Weikai Luo, Jinxiang Wu, Xinjun Li, Hui Yang, Xiaotian Zhao and Hongyu An
The spin–orbit torques within a Pt/Tm3Fe5O12 (TmIG) bilayer offer an expedient method for manipulating the magnetization of TmIG. However, the practical application of TmIG is hindered by the presence of an external field during switching. Here, we demonstrate field-free magnetization switching in Pt/TmIG bilayer on a vicinal substrate with minimal sacrifice to the perpendicular magnetic anisotropy (PMA) of TmIG. With the assistance of tilt PMA, reversible perpendicular magnetization switching is realized in the absence of an external field. Our results offer an alternative solution for achieving field-free perpendicular magnetization switching in a Pt/TmIG bilayer, thereby fostering the advancement of emerging SOT-based devices.
Pt/Tm3Fe5O12(TmIG)双层层内的自旋轨道力矩为操纵 TmIG 的磁化提供了一种便捷的方法。 然而,TmIG 的实际应用却因切换过程中存在外部磁场而受到阻碍。在这里,我们展示了在沧桑基底上的 Pt/TmIG 双层中的无磁场磁化切换,其对 TmIG 的垂直磁各向异性(PMA)的牺牲最小。 在倾斜 PMA 的帮助下,在没有外场的情况下实现了可逆的垂直磁化切换。我们的研究结果为在 Pt/TmIG 双层中实现无磁场垂直磁化切换提供了另一种解决方案,从而促进了基于 SOT 的新兴器件的发展。
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引用次数: 0
Evaluation of polar alignment structure and surface anchoring energy in ferroelectric nematic liquid crystals by renormalized transmission spectroscopic ellipsometry 利用重正化透射光谱椭偏仪评估铁电向列液晶中的极性排列结构和表面锚定能
IF 2.3 4区 物理与天体物理 Q3 PHYSICS, APPLIED Pub Date : 2024-03-14 DOI: 10.35848/1882-0786/ad2cff
Sakunosuke Abe, Amon Nakagawa, Yosei Shibata, Munehiro Kimura and Tadashi Akahane
It is essential to estimate the surface polar anchoring energy in order to discuss the interfacial orientation of ferroelectric nematic liquid crystals. In this study, we accurately estimated the twist angle of a -twist cell with an antiparallel rubbing manner, by means of renormalized transmission spectroscopic ellipsometry, which has a great deal of experience in measuring the twist angle of ordinary nematic liquid crystals. We also succeeded in estimating the reduced polar anchoring energy from the essential equation derived from the simplified torque balance equation. It is assumed that the reduced surface polar anchoring energy is on the order of 102.
要讨论铁电向列液晶的界面取向,估算表面极性锚定能至关重要。在这项研究中,我们利用在测量普通向列液晶扭转角方面具有丰富经验的重归一化透射光谱椭偏仪,准确地估算了具有反平行摩擦方式的-扭转晶胞的扭转角。我们还成功地从简化扭矩平衡方程导出的基本方程中估算出了还原极性锚定能。假定还原表面极性锚定能量约为 102。
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引用次数: 0
A simple reflective metalens based on reverse design for an ultra-high-efficiency free space wavelength splitter 基于反向设计的简单反射金属膜,用于超高效率自由空间波长分配器
IF 2.3 4区 物理与天体物理 Q3 PHYSICS, APPLIED Pub Date : 2024-03-12 DOI: 10.35848/1882-0786/ad2c00
Chao Wang, Yunpeng Hao, Boqi Wu, Fan Yang, Chunlei Zhao, Yaodan Chi and Xiaotian Yang
We propose two kinds of high-efficiency free-space wave splitters in the mid-IR band using reverse design. The wavelength divider based on the abnormal reflection principle realizes a beam-splitting angle of 22.00° and 10.92° by controlling the phase distribution, and the reflection efficiency of both wavelengths exceeds 50%. The wavelength divider designed based on the concept of metalens simultaneously accomplishes the functions of focusing and beam splitting. It has a focal length of 100 μm and a relative focal position of 100 μm. Most importantly, the focusing efficiency for the two wavelengths reaches an impressive 48.59% and 72.51%, respectively.
我们提出了两种采用逆向设计的中红外波段高效自由空间分波器。基于非正常反射原理的分波器通过控制相位分布实现了 22.00° 和 10.92° 的分束角,两个波长的反射效率均超过 50%。基于 Metalens 概念设计的波长分配器可同时实现聚焦和分束功能。它的焦距为 100 μm,相对焦距为 100 μm。最重要的是,两个波长的聚焦效率分别达到了令人印象深刻的 48.59% 和 72.51%。
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引用次数: 0
Multibeam X-ray tomography optical system for narrow-energy-bandwidth synchrotron radiation 用于窄能带同步辐射的多波束 X 射线断层摄影光学系统
IF 2.3 4区 物理与天体物理 Q3 PHYSICS, APPLIED Pub Date : 2024-03-11 DOI: 10.35848/1882-0786/ad2aff
Wolfgang Voegeli, Haruki Takayama, Xiaoyu Liang, Tetsuroh Shirasawa, Etsuo Arakawa, Hiroyuki Kudo and Wataru Yashiro
The design and evaluation experiments of a multibeam X-ray tomography optical system that can be used with synchrotron radiation from sources with a narrow energy bandwidth, i.e. undulator sources, are reported. It consists of silicon single crystals that diffract the incident X-rays to 27 beams, which are used to image a sample. The energy of the beams was aligned with an accuracy sufficient for use at typical undulator beamlines. Projection images of a test sample were collected and successfully reconstructed, showing the feasibility of a high-speed X-ray tomography instrument based on the optical system.
报告介绍了一种多光束 X 射线断层摄影光学系统的设计和评估实验,该系统可用于能量带宽较窄的同步辐射源(即衰减器辐射源)。该系统由硅单晶组成,可将入射的 X 射线衍射成 27 束光束,用于对样品成像。这些光束的能量被精确对准,足以在典型的衰减器光束线中使用。测试样品的投影图像已被采集并成功重建,这表明基于该光学系统的高速 X 射线断层成像仪是可行的。
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引用次数: 0
8.7 A/700 V β-Ga2O3 Schottky barrier diode demonstrated by oxygen annealing combined with self-aligned mesa termination 通过氧退火结合自对准介子端接演示 8.7 A/700 V β-Ga2O3 肖特基势垒二极管
IF 2.3 4区 物理与天体物理 Q3 PHYSICS, APPLIED Pub Date : 2024-03-11 DOI: 10.35848/1882-0786/ad2d73
Feihong Wu, Zhao Han, Jinyang Liu, Yuangang Wang, Weibing Hao, Xuanze Zhou, Guangwei Xu, Yuanjie Lv, Zhihong Feng and Shibing Long
β-Ga2O3 Schottky barrier diodes (SBDs) with low-defect epitaxial surface and effective termination are essential for realizing excellent blocking characteristics. This work systematically studied oxygen annealing at various temperatures, optimizing the epitaxial surface by reducing the surface roughness and dislocation density. Combined with mesa termination, the results showed that the breakdown voltage (Vbr) significantly increased from 845 V to 1532 V. The device with a 3 × 3 mm2 anode size was fabricated simultaneously, and the high forward currents of 8.7 A@2 V and Vbr > 700 V were achieved. This work shows a possible solution for the commercialization of β-Ga2O3 SBDs.
具有低缺陷外延表面和有效端接的 β-Ga2O3 肖特基势垒二极管 (SBD) 是实现优异阻塞特性的关键。这项工作系统地研究了不同温度下的氧退火,通过降低表面粗糙度和位错密度来优化外延表面。同时制作了阳极尺寸为 3 × 3 mm2 的器件,并实现了 8.7 A@2 V 的高正向电流和 Vbr > 700 V。这项工作为 β-Ga2O3 SBD 的商业化提供了一种可能的解决方案。
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引用次数: 0
Electrical properties and band alignments of Sb2Te3/Si heterojunctions, low-barrier Sb2Te3/n-Si and high-barrier Sb2Te3/p-Si junctions Sb2Te3/Si 异质结、低势垒 Sb2Te3/n-Si 和高势垒 Sb2Te3/p-Si 结的电学特性和能带排列
IF 2.3 4区 物理与天体物理 Q3 PHYSICS, APPLIED Pub Date : 2024-03-08 DOI: 10.35848/1882-0786/ad2d75
Naoya Okada, Wen Hsin Chang, Shogo Hatayama, Yuta Saito and Toshifumi Irisawa
We investigated the electrical junction properties of the layered Sb2Te3 film formed on Si substrates. The current−voltage characteristics of the Sb2Te3/n-Si heterojunction showed an ohmic properties, whereas the Sb2Te3/p-Si heterojunction exhibited rectifying properties with a high barrier height of 0.77 eV. The capacitance−voltage characteristics of MOS capacitors with the Sb2Te3 electrode indicated an effective work function of 4.44 eV for the Sb2Te3 film. These findings suggest that the Sb2Te3/Si heterostructure possesses a low conduction band offset, as inferred from the temperature dependence of the current−voltage characteristics of the Sb2Te3/n-Si.
我们研究了在硅衬底上形成的层状 Sb2Te3 薄膜的电结特性。Sb2Te3/n-Si 异质结的电流-电压特性显示出欧姆特性,而 Sb2Te3/p-Si 异质结则显示出整流特性,具有 0.77 eV 的高势垒高度。带有 Sb2Te3 电极的 MOS 电容器的电容-电压特性表明,Sb2Te3 薄膜的有效功函数为 4.44 eV。从 Sb2Te3/n-Si 电流-电压特性的温度依赖性推断,这些发现表明 Sb2Te3/Si 异质结构具有较低的导带偏移。
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引用次数: 0
Extraction of interfacial thermal resistance across an organic/semiconductor interface using optical-interference contactless thermometry 利用光干涉非接触测温法提取有机物/半导体界面的界面热阻
IF 2.3 4区 物理与天体物理 Q3 PHYSICS, APPLIED Pub Date : 2024-03-06 DOI: 10.35848/1882-0786/ad2b01
Jiawen Yu, Hiroaki Hanafusa and Seiichiro Higashi
We have developed an experimental method to extract interfacial thermal resistance (ITR) at an organic/semiconductor interface based on optical-interference contactless thermometry. The proposed technique was applied to a SU-8/SiC bilayer sample, and clear oscillations in reflectivity induced by optical interference during pulse heating and cooling were observed. After fitting the observed reflectivity waveform with simulation results by a two-dimensional (2D) double-layer heat conduction model and multi-reflection calculations, ITR was extracted as 190 mm2 K W−1, which resulted in a temperature drop of 11 K at the interface. Moreover, the 2D transient temperature distribution of the sample throughout pulse heating and cooling was obtained.
我们开发了一种基于光干涉非接触测温法提取有机物/半导体界面热阻(ITR)的实验方法。我们将所提出的技术应用于 SU-8/SiC 双层样品,观察到在脉冲加热和冷却过程中光干涉引起的反射率的明显振荡。将观察到的反射率波形与二维(2D)双层热传导模型和多反射计算的模拟结果拟合后,提取出的 ITR 为 190 mm2 K W-1,这导致界面处的温度下降了 11 K。此外,还获得了样品在整个脉冲加热和冷却过程中的二维瞬态温度分布。
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引用次数: 0
Nanosecond recombination lifetimes and spin relaxation times in (110) InGaAs/AlGaAs quantum wells at room temperature 室温下 (110) InGaAs/AlGaAs 量子阱中的纳秒级重组寿命和自旋弛豫时间
IF 2.3 4区 物理与天体物理 Q3 PHYSICS, APPLIED Pub Date : 2024-03-06 DOI: 10.35848/1882-0786/ad2907
Satoshi Iba and Yuzo Ohno
Quantum wells in InGaAs/AlGaAs with (110) orientation are attractive as active layers in spin-controlled lasers with circularly polarized emission, while the spin relaxation time is expected to be larger than for (100)-oriented layers. However, the hitherto reported recombination lifetimes (40 ps) and spin relaxation times (440 ps) of (110) InGaAs/AlGaAs structures are insufficient. Here it is shown that higher growth temperatures and higher V/III beam equivalent pressure ratios than previously used in crystal growth by molecular beam epitaxy lead to recombination and spin relaxation times in the nanosecond range at RT, meeting the requirements for application in spin lasers.
具有(110)取向的 InGaAs/AlGaAs 量子阱作为具有圆偏振发射的自旋控制激光器的有源层具有吸引力,而自旋弛豫时间预计比(100)取向层更长。然而,迄今为止所报道的 (110) InGaAs/AlGaAs 结构的重组寿命(40 ps)和自旋弛豫时间(440 ps)是不够的。这里的研究表明,与以前通过分子束外延方法生长晶体时使用的温度和 V/III 束等效压力比相比,更高的生长温度和 V/III 束等效压力比可以使晶体在 RT 时的重组和自旋弛豫时间达到纳秒级,从而满足自旋激光器的应用要求。
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引用次数: 0
A two-stage insulation method for suppressing thermal crosstalk in microarray sensitive units 抑制微阵列敏感单元热串扰的两级绝缘方法
IF 2.3 4区 物理与天体物理 Q3 PHYSICS, APPLIED Pub Date : 2024-03-06 DOI: 10.35848/1882-0786/ad2b00
Shining Zhu, Xin Li, Zhengjie Luo, Xuguang Jia, Yue Qin, Hao Guo, Jun Tang, Zhonghao Li, Huanfei Wen, Zongmin Ma and Jun Liu
Thermal crosstalk between array structures is a key factor in limiting the sensitivity of micro-nano array sensors. We propose a two-stage thermally isolated structure with thermal holes and heat dissipation layer and pulsed voltage heating to reduce thermal crosstalk. Through finite element thermal simulation analysis as well as thermal interference test, the results show that the thermal crosstalk of the two-stage structure is reduced by 12.89% and 39.67%, respectively, in the steady state compared to the structure with no thermal isolation, and pulsed voltage heating leads to the thermal crosstalk of the two-stage structure to be <10%.
阵列结构之间的热串扰是限制微纳阵列传感器灵敏度的关键因素。我们提出了一种带有导热孔和散热层的两级热隔离结构,并通过脉冲电压加热来减少热串扰。通过有限元热仿真分析和热干扰测试,结果表明与没有热隔离的结构相比,两级结构的热串扰在稳态下分别减少了 12.89% 和 39.67%,脉冲电压加热使两级结构的热串扰小于 10%。
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引用次数: 0
期刊
Applied Physics Express
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