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Observation of Weak Anti-Localization and Electron-Electron Interaction on Few-Layer 1T′-MoTe_2 Thin Films
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Electronic transports of few-layer 1T'-MoTe_2 films are measured at temperatures down to 0.26 K. The lowtemperature conductivity exhibits logarithmic temperature dependence and negative magneto response. The negative magnetoconductivity can be well fitted by the two-dimensional weak anti-localization theory taking a single channel of electrons into account, with the parameters α≈-0.5 and l_φ∝ T~(-0 5). The logarithmic temperature dependence has a positive slope κ≈0.75, indicating the dominance of electron-electron interaction over the weak anti-localization effect, with an apparently negative Coulomb screening factor F that demands future work for clarification. 相似文献
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Transport Studies on GaAs/AlGaAs Two-Dimensional Electron Systems Modulated by Triangular Array of Antidots
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Triangular antidot lattices of various periods and aspect ratios are fabricated on high mobility GaAs/AlGaAs two-dimensional electron systems(2DESs),and are characterized by magneto-transport measurements at low temperatures down to 300 mK. Commensurability peaks are generally observed in the magneto-resistivity ρ_(xx),and remarkable similarity between dρ_(xy)/dB and ρ_(xx) is found. In samples of relatively large aspect ratio d/a, the Aharonov-Bohm-type oscillations are clearly observed in both ρ_(xx) and ρ_(xy), as well as the quenching of the Hall resistivity ρ_(xy) in the vicinity of B = 0. These observations evince the good quality of our samples, and attest to the adequate preparation for fabricating antidot lattices of a reduced period to realize artificial graphene from GaAs/AlGaAs 2DESs. 相似文献
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Compositional Dependence of Electronic Specific Heat in AlCuCo Decagonal Quasicrystals: Evidence for the Hume-Rothery Mechanism of Phase Formation
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There is no consensus whether the electron density of states of decagonal quasicrystals has a pseudogap at the Fermi energy similar to that of the icosahedron phase. We answer this question by measuring the electronic specific heat coefficient of AlCuCo decagonal single-quasicrystals over a wide range of composition. While the average valence electron number per atom, e/a, for all the resultant samples changes only within 1.5%, from-1.92 to less than 1.95. The specific heat coefficient decreases by 15% with the increasing e/a. The large change and the negative slope give strong evidence for Hume-Rothery mechanism of the decagonal phase. 相似文献
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Spatially resolved gap closing in single Josephson junctions constructed on Bi_2Te_3 surface
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Full gap closing is a prerequisite for hosting Majorana zero modes in Josephson junctions on the surface of topological insulators.Previously,we have observed direct experimental evidence of gap closing in Josephson junctions constructed on Bi_2Te_3 surface.In this paper we report further investigations on the position dependence of gap closing as a function of magnetic flux in single Josephson junctions constructed on Bi_2Te_3 surface. 相似文献
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本文介绍了一台用于交流小讯号测量的低温恒温器.利用内液池减压,最低温度可达1.370K,并且在测量功率为0.15mW时,内液池液氦可以维持样品温度在1.4K达20小时以上.系统装置了在8T的背景磁场内最高可达0.18T的交变调制场,从而可以实现利用双交流法精细测量磁阻或霍耳系数随磁场变化的函数关系.试验结果表明,此恒温器具有低液氦蒸发量和可从1.3~300K连续控温的特点.用此装置对Co膜的霍尔系数测量的实验中,霍尔电压变化量的测量精度达到了0.5nV. 相似文献
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测量了块体金属玻璃Zr46.75Ti8.25Cu7.5Ni10Be27.5在退火前后其电阻值随温度的变化,测量的温度范围为1.5-300K.样品在退火前后都发现有超导现象.零磁场下其超导转变温度Tc分别为1.84和3.76K.在5-300K温度范围内,原始样品具有负的电阻温度系数.如果取Zr,Ti,Cu,Ni及Be分别贡献出1.5,1.5,0.5,0.5及两个传导电子,则可以用扩展的Faber-Ziman理论去解释原始样品的负电阻温度系数.还对块体金属玻璃Zr46.75Ti8.25Cu7.5Ni10Be27.5在温度范围5-300K之间的R(T)曲线用一个多项式进行了拟合. 相似文献