Adiabatic Edge Channel Transport in a Nanowire Quantum Point Contact Register

详细信息    查看全文

• 作者：S. Heedt ; A. Manolescu ; G. A. Nemnes ; W. Prost ; J. Schubert ; D. Grützmacher ; Th. Schäpers
• 刊名：Nano Letters
• 出版年：2016
• 出版时间：July 13, 2016
• 年：2016
• 卷：16
• 期：7
• 页码：4569-4575
• 全文大小：511K
• 年卷期：0
• ISSN：1530-6992

文摘

We report on a prototype device geometry where a number of quantum point contacts are connected in series in a single quasi-ballistic InAs nanowire. At finite magnetic field the backscattering length is increased up to the micron-scale and the quantum point contacts are connected adiabatically. Hence, several input gates can control the outcome of a ballistic logic operation. The absence of backscattering is explained in terms of selective population of spatially separated edge channels. Evidence is provided by regular Aharonov–Bohm-type conductance oscillations in transverse magnetic fields, in agreement with magnetoconductance calculations. The observation of the Shubnikov–de Haas effect at large magnetic fields corroborates the existence of spatially separated edge channels and provides a new means for nanowire characterization.