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排序方式: 共有124条查询结果,搜索用时 15 毫秒
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96.
李玲 Kaestner B Blumenthai M D Giblin S Janssen T J B M Pepper M Anderson D Jones G Ritchie D A 高洁 《物理学报》2008,57(3):1878-1885
除了直流负电压外,还在浅法刻蚀出的GaAs/AlGaAs量子线上的两个金属指形门上分别叠加两个相位相差π的正弦信号,从而对形成量子点的两个势垒作不等幅调制.在无源漏偏压的情况下,通过周期形成的量子点实现了单电子的搬运.由于新的半导体量子点单电子泵不是依赖库仑阻塞效应通过隧穿进行单电子输运,因此,该器件就不会受到固定隧穿时间引起的低工作频率限制.在1.7K温度下,频率达到3GHz仍然可以观测到量子化电流平台,对应的电流值达到0.5nA量级.这种新器件提供了实现高速度、高精度搬运单电子的另一种可能途径.
关键词:
单电子输运
单电子旋转门
单电子泵
量子化电流平台 相似文献
97.
Danneau R Klochan O Clarke WR Ho LH Micolich AP Simmons MY Hamilton AR Pepper M Ritchie DA 《Physical review letters》2008,100(1):016403
We study the anomalous conductance plateau around G=0.7(2e2/h) and the zero bias anomaly in ballistic hole quantum wires with respect to in-plane magnetic fields applied parallel B parallel and perpendicular B perpendicular to the quantum wire. As seen in electron quantum wires, the magnetic fields shift the 0.7 structure down to G=0.5(2e2/h) and simultaneously quench the zero bias anomaly. However, these effects are strongly dependent on the orientation of the magnetic field, owing to the highly anisotropic effective Landé g-factor g* in hole quantum wires. Our results highlight the fundamental role that spin plays in both the 0.7 structure and zero bias anomaly. 相似文献
98.
S. Cin D. D. Arnone H. P. Hughes D. Whittaker M. Pepper D. A. Ritchie 《Physica E: Low-dimensional Systems and Nanostructures》2000,6(1-4)
We show that the presence of InAs dots embedded in a host GaAs quantum well containing a two-dimensional electron gas dramatically modifies the cyclotron resonance (CR). Far-infrared CR measurements show two modes with different dispersions with applied magnetic field B. The lower-frequency mode, with a sub-linear dependence on B, is identified as a CR at low B, developing into a skipping orbit around the dot perimeters at higher B. This has not been previously observed for a system with randomly distributed scatterers. The higher-frequency mode is identified as a magnetoplasmon localised by the confining effect of the arrays of repulsive potentials due to the dots in the well. 相似文献
99.
David Charles Pepper 《Macromolecular rapid communications》1996,17(3):157-161
Recently rediscovered evidence supports the conclusion that the bimodality of molarmass distributions in polystyrenes initiated by HCIO4 is not, as widely believed, the consequence of independent chain-growth by different propagating species, but originates from lack of uniformity in reagent concentrations during the earliest stage of the polymerization, where the time-scale of the growth and decay of the transient ionic population is short compared with that of mixing, in conventional preparative experiments. 相似文献
100.
S. E. Pepper D. R. Peterman T. J. Tranter B. M. White 《Journal of Radioanalytical and Nuclear Chemistry》2009,282(3):909-912
A cloud point extraction method followed by inductively coupled plasma-mass spectrometry (ICP-MS) has been developed for the
detection of trivalent lanthanides (Ln(III)) in aqueous samples. Ammonium pyrrolodinedithiocarbamate (APDC) was used as the
chelating ligand with 2 wt% Triton X-114 as the surfactant. Various experimental parameters were investigated and the extraction
efficiency, distribution ratios and concentration factors for the extraction of lanthanum (La), neodymium (Nd), europium (Eu)
and thulium (Tm) were determined. 相似文献