排序方式: 共有21条查询结果,搜索用时 15 毫秒
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Kim J. Matagne P. Leburton J.-P. Martin R.M. Hatano T. Tarucha S. 《Nanotechnology, IEEE Transactions on》2006,5(4):343-349
We use three-dimensional self-consistent Kohn-Sham's equations coupled with Poisson's equation to investigate the electrical behavior of laterally coupled vertical quantum dots (LCVQD) for spin-qubit operation. The shape and the depth of the central gate are changed in different ways to correlate gate geometry with the coupling between the two quantum dots. Upon comparing LCVQD single-gate and the split-gate structures, we found that the two inherently different designs result in different energy barrier profiles leading to dissimilar wavefunction coupling between the two dots. Finally, we show that the doping concentrations in the layered structure could be optimized for practical two-qubit operation. 相似文献
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FM mode locking of an LiNdP4 O12 (LNP) laser with an intracavity modulator is reported. Mode-locked optical pulses with a pulse width of 49 ps at a repetition rate of 960 MHz, corresponding toc/2L (c :light velocity,L :cavity length), have been obtained. A pulse repetition rate as high as 2.88 GHz has been achieved with a multiple mode-locking technique. 相似文献
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Optical bistable switching and optical triode operation have been carried out using an optical directional coupler switch fabricated by Ti diffusion into LiNbO3 at the 1.15 μm wavelength. The on/off ratio in conventional bistable switching was 10 dB and that in complementary bistable switching was 13 dB. Amplification gain in triode operation controlled by laser diode was 4.8 dB. Complementary operation was found to reduce feedback gain and to improve the on/off ratio in optical bistable switching. 相似文献
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Anne W. Draelos Ming Tso Wei Andrew Seredinski Chung Ting Ke Yash Mehta Russell Chamberlain Kenji Watanabe Takashi Taniguchi Michihisa Yamamoto Seigo Tarucha Ivan V. Borzenets François Amet Gleb Finkelstein 《Journal of Low Temperature Physics》2018,191(5-6):288-300
In this study, we examine multiple encapsulated graphene Josephson junctions to determine which mechanisms may be responsible for the supercurrent observed in the quantum Hall (QH) regime. Rectangular junctions with various widths and lengths were studied to identify which parameters affect the occurrence of QH supercurrent. We also studied additional samples where the graphene region is extended beyond the contacts on one side, making that edge of the mesa significantly longer than the opposite edge. This is done in order to distinguish two potential mechanisms: (a) supercurrents independently flowing along both non-contacted edges of graphene mesa, and (b) opposite sides of the mesa being coupled by hybrid electron–hole modes flowing along the superconductor/graphene boundary. The supercurrent appears suppressed in extended junctions, suggesting the latter mechanism. 相似文献