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国家重点基础研究发展计划(2009CB929400)

作品数:8 被引量:20H指数:2
相关作者:薛平马旭村张翼薛其坤何珂更多>>
相关机构:清华大学中国科学院更多>>
发文基金:国家重点基础研究发展计划国家自然科学基金国家高技术研究发展计划更多>>
相关领域:理学电子电信自动化与计算机技术化学工程更多>>

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拓扑绝缘体薄膜和有限尺寸效应被引量:4
2011年
拓扑绝缘体是近年来发现的一类新的量子材料,已成为凝聚态物理的研究热点领域.厚度仅几纳米的拓扑绝缘体薄膜不但具有奇特的物理性质,而且还是拓扑绝缘体应用于平面器件的基础.文章以Bi2Se3为例,介绍了Bi2Se3家族拓扑绝缘体薄膜的分子束外延生长以及其能带、自旋结构和拓扑性质随层厚的演化.这些结果为人工调控拓扑绝缘体的电子结构和物理性质提供了指导.
张翼何珂马旭村薛其坤
关键词:拓扑绝缘体分子束外延角分辨光电子能谱扫描隧道显微镜
Application of longitudinal generalized magneto-optical ellipsometry in magnetic ultrathin films
2014年
The longitudinal generalized magneto-optical ellipsometry (GME) method is extended to the measurement of three- layer ultrathin magnetic films. In this work, the theory of the reflection matrix is introduced into the GME measurement to obtain the reflective matrix parameters of ultrathin multilayer magnetic films with different thicknesses. After that, a spectroscopic ellipsometry is used to determine the optical parameter and the thickness of every layer of these samples, then the magneto-optical coupling constant of the multilayer magnetic ultrathin film can be obtained. After measurements of a series of ultrathin Fe films, the results show that the magneto-optical coupling constant Q is independent of the thickness of the magnetic film. The magneto-optical Kerr rotations and ellipticity are measured to confirm the validity of this experiment. Combined with the optical constants and the Q constant, the Kerr rotations and ellipticity are calculated in theory. The results show that the theoretical curve fits very well with the experimental data.
王晓连洁张福军高尚陈延学于晓红李萍王英顺孙兆宗
Electron interaction and localization in ultrathin topological insulator films
2012年
In this article we review recent transport property studies on topological insulator thin films grown by molecular beam epitaxy.In pure Bi2Se3 ultrathin films we find an insulating ground state in the presence of weak antilocalization,which indicates the relevance of electron interaction effect.In magnetically doped Bi2Se3 film we observe a systematic crossover between weak localization and weak antilocalization with varied magnetic doping,temperature,and magnetic field.These results demonstrate the intricate interplay between topological delocalization,electron interaction,and broken time reversal symmetry in topological insulator thin films.
LIU MinHaoWANG YaYu
关键词:LOCALIZATION
From magnetically doped topological insulator to the quantum anomalous Hall effect
2013年
Quantum Hall effect (QHE), as a class of quantum phenomena that occur in macroscopic scale, is one of the most important topics in condensed matter physics. It has long been expected that QHE may occur without Landau levels so that neither external magnetic field nor high sample mobility is required for its study and application, Such a QHE free of Landau levels, can appear in topological insulators (TIs) with ferromagnetism as the quantized version of the anomalous Hall effect, i.e., quantum anomalous Hall (QAH) effect. Here we review our recent work on experimental realization of the QAH effect in magnetically doped TIs. With molecular beam epitaxy, we prepare thin films of Cr-doped (Bi,Sb)2Te3 TIs with well- controlled chemical potential and long-range ferromagnetic order that can survive the insulating phase. In such thin films, we eventually observed the quantization of the Hall resistance at h/e2 at zero field, accompanied by a considerable drop in the longitudinal resistance. Under a strong magnetic field, the longitudinal resistance vanishes, whereas the Hall resistance remains at the quantized value. The realization of the QAH effect provides a foundation for many other novel quantum phenomena predicted in TIs, and opens a route to practical applications of quantum Hall physics in low-power-consumption electronics.
何珂马旭村陈曦吕力王亚愚薛其坤
高性能光学相干层析成像的研究被引量:13
2021年
介绍了光学相干层析成像在不断提升其性能方面的一些研究,其中主要包括在成像的分辨率、成像速度、成像探头等基础核心指标方面大幅提升的代表性工作。综述了清华大学物理系近二十多年来在光学相干层析成像研究方面的一系列重要进展,包括取得了纵向分辨率为0.64μm的高分辨率成像、E3.5长时间细胞活体的亚细胞分辨成像,成功研制了速度高达40 MHz的高速扫频激光器,实现了基于光计算的每秒1000万次轴向线扫描的超高速实时光学成像信息处理等。
薛平
关键词:成像系统光纤激光器
Sb complexes and Zn interstitials in Sb-implanted ZnO epitaxial films
2011年
In the present work, post-annealing is adopted to investigate the formation and the correlation of Sb complexes and Zn interstitials in Sb-ion implanted ZnO films, by using Raman scattering technique and electrical characterizations. The damage of Zn sublattice, produced by ion bombardment process is discerned from the unrecovered E2 (L) peak in annealed high Sb+ dose implanted samples. It is suggested that the Zn sublattice may be strongly affected by the introduction of Sb dopant because of the formation of Sbzn-2Vz,, complex acceptor. The appearance of a new peak at 510 cm-1 in the annealed high dose Sb+ implanted samples is speculated to result from (Zn interstitials-O interstitials) Zni-Oi complex, which is in a good accordance with the electrical measurement. The p-type ZnO is difficult to obtain from the Sb+ implantation, however, which can be realized by in-situ Sb doping with proper growth conditions instead.
刘尧平英敏菊梅增霞李俊强杜小龙A. Yu. Kuznetsovc
关键词:ZNO
Temperature dependence of Cu20 orientations in the oxidation of Cu (111)/ZnO (0001) by oxygen plasma被引量:1
2012年
The role of temperature on the oxidation dynamics of Cu20 on ZnO (0001) was investigated during the oxidation of Cu (111)/ZnO (0001) by using oxygen plasma as the oxidant. A transition from single crystalline Cu20 (111) orientation to micro-zone phase separation with multiple orientations was revealed when the oxidation temperature increased above 300 ~ C. The experimental results clearly show the effect of the oxidation temperature with the assistance of oxygen plasma on changing the morphology of Cu (111) film and enhancing the lateral nucleation and migration abilities of cuprous oxides. A vertical top-down oxidation mode and a lateral migration model were proposed to explain the different nucleation and growth dynamics of the temperature-dependent oxidation process in the oxidation of Cu (lll)/ZnO (0001).
李俊强梅增霞叶大千侯尧楠刘尧平A.Yu.Kuznetsov杜小龙
关键词:OXIDATIONPLASMA
Handheld optical coherence tomography device for photodynamic therapy被引量:2
2012年
Photodynamic therapy (PDT) is a very effective treatment for port wine stains (PWS). To guide and assess PDT treatment, a handheld optical coherence tomography (OCT) probe was designed for real-time imaging of the PWS patient. The system uses a light source with a center wavelength of 1310 nm, -3 dB bandwidth of 90 nm and an optical power of 9 mW. The system also has a spatial resolution of 8 μm (lateral) × 7 μm (axial), an imaging rate of 4 frames per second, and a 102 dB sensitivity. We then demonstrate that the OCT imaging system can clearly distinguish between normal and PWS tissues. Therefore, the system can provide valuable guidance for PDT treatment.
WANG TianShiWANG ChengMingHUANG NaiYanZHANG JianGU YingXUE Ping
关键词:光动力疗法光学相干断层扫描实时成像空间分辨率
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