多个介观电子器件间的电流交叉关联.docVIP

多个介观电子器件间的电流交叉关联 柯莎莎1，吕海峰1,2，杨华军1，郭永3，张怀武1 1 电子科技大学物理电子学院电子薄膜与集成器件国家重点实验室，成都　610054 2 香港大学物理系，香港 3 清华大学物理系低维量子物理国家重点实验室，北京　100084 摘要：本文分析了无直接相互作用的两个介观量子器件间的电流交叉关联特性，这两个器件共 同库伦耦合于第三个介观器件。我们展示了在低偏压下无直接相互作用的这两个介观器件的电 流关联并不弱于直接耦合的情形。更重要的是，流过这两个器件的电流间竞争与合作关系变得 不可预测，关联特性依赖于能级的位置和连接导体的特性。当它们和连接导体的关联为零时， 这两个间接耦合的量子器件的输运性质依然可以很强的关联在一起。 关键词：凝聚态物理学；介观电子器件；电流交叉关联 中图分类号： O469 Current noise cross correlations in multiple mesoscopic conductors KE Sha-Sha1, LU Hai-Feng 1,2 , YANG Hua-Jun1, GUO Yong3, and ZHANG Huai-Wu1 1 State Key Laboratory of Electronic Thin Films and Integrated Devices and School of Physical Electronics, University of Electronic Science and Technology of China, Chengdu 610054, China 2 Department of Physics, The University of Hong Kong, Pokfulam Road, Hong Kong, China 3 Department of Physics and State Key Laboratory of Low-Dimensional Quantum Physics, Tsinghua University, Beijing 100084, China Abstract: We analyze the current noise cross correlations (CCs) between the currents through two mesoscopic conductors without direct interaction, where a connected conductor is capaci- tively coupled with them. We demonstrate that the CCs between two indirectly-coupled con- ductors do not decrease when the device works at low bias voltages. More importantly, the competitive or cooperative relationship between two currents is also unpredictable, which de- pends on the level con?guration and the property of the connected conductor. Even when the CCs between directly-coupled channels vanish, the tunneling currents through two indirectly- coupled conductors are still strongly correlated. Foundations: This project was supported by the National Basic Research Program of China (2011CB606405), the NSFC (No., and the Fundamental Research Funds for the Central Universities (No. ZYGX2012J052). Brief author introduction: Corresponding author: GUO Yong, Male , Professor, present main research di- rection: spin-polarized transport throug