The electronic transport efficiency of a graphene charge carrier guider

报告题目:The electronic transport efficiency of a graphene charge carrier guider

and an AharanovBohm interferometer

报告人:成淑光  西北大学

报告时间:20195 21 日 晚 7:00-8:00

邀请人: 江华

报告地点:致远楼 304

报告摘要:The electrostatic gating defined channel in graphene forms a charge carrier guider. We theoretically investigated electronic transport properties of a single channel and an AharanovBohm (AB) interferometer, based on a charge carrier guider in a graphene nanoribbon. Quantized conductance is found in a single channel, and the guider shows high efficiency in the optical fiber regime, in good agreement with the experiment results. For an AB interferometer without a magnetic field, quantized conductance occurs when there are a few modes inside the channel. The local density of states (LDOS) inside the AB interferometer shows quantum scars when the scattering is strong. At low magnetic field, a periodical conductance oscillation appears. The conductance has a maximum value at zero magnetic field in the absence of intravalley scattering. The mechanism was investigated by LDOS calculations and a toy model.

报告人简介:成淑光,2004年于山西大学物理系获得学士学位。2009年于中国科学院物理研究所获得博士学位。2009年至今在西北大学物理学院工作。感兴趣的方向是各类自由度电子输运的研究。


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