Low-temperature conductance of the weak junction in InAs nanowire in the field of AFM scanning gate
A. A. Zhukov, Ch. Volk+, A. Winden*, H. Hardtdegen*, Th. Schäpers+
Institute of Solid State Physics RAS, 142432 Chernogolovka, Russia
+Institute of Bio- and Nanosystems (IBN-1): Semiconductor Nanoelectronics, Juelich, Germany
*Institute of Bio- and Nanosystems (IBN-1) and JARA-Fundamentals of Future Information Technology, Research Centre Jülich, 52425 Jülich Germany
Abstract
We investigate the conductance of the InAs nanowire in the
presence of electrical potential created by AFM scanning gate. At helium
temperature Coulomb blockade diamonds pattern give the same result for
quantum dot sizes ratio as reveals scanning gate imaging. The essential
influence of local electrical field direction on the tunneling rate through
the weak junction in InAs wire is observed. To explain this behavior the
redistribution of the electrons among conductive channels in the wire must be
taken into account.