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Lecture Saskia Fisher

Roster

WhenWhere
26 July 2007 FWN-Building 5114.0004, Nijenborgh 4, 9747 AG, Groningen
Speaker: Dr. Saskia Fisher
Affiliation: Ruhr-Universität Bochum, Germany
Title: Controlled coupled quantum-wire states in transport measurements
Date: Thu Jul 26, 2007
Start: 15.00
Location: FWN-Building 5114.0004
Host: Caspar van der Wal
Telephone: +31 50 363 4555

Abstract

Coherent electron flow in electron wave guides (EWGs) may play an important role in the operation of proposed semiconductor mesoscopic and nanoscale devices [1-4].

In the first part of the talk, I will give a review on coupling phenomena between one-dimensional electron systems (1DES). The formation of coupled quantum-wire states depends on the symmetry of the confining potential and the coupling strength [6]. Results of the magnetic field control of mode-coupling in tunnel-coupled vertically stacked dual 1DES [7] are reproduced well by analytical [8] and numerical calculations [9].

In the second part of the talk I will address how experimental access to single-mode spin-split transport channels may be of particular interest for spin-dependent quantum transport devices. We observe spin-split 1D subbands in perpendicular magnetic fields and find first indications of mode-coupling between spin-split subbands.

1) A. Bertoni, et al. Phys. Rev. Lett. 84, 5912-15 (2000).
2) R. Ioniciou, et al. Int. J. Mod. Physics B 15, 125-133 (2001).
3) M. Gilbert, et al. Appl. Phys. Lett. 81, 4284-4286 (2002).
4) M. Snyder, et al. Phys. Rev. A 70, 052330-1-9 (2004).
5) C. Bennett, and D. DiVincenzo, , Nature 404, 247-255 (2000).
6) S. Fischer, et al. Nature Physics 2, 91-96 (2006).
7) S. Fischer, et al. Phys. B 74, 115324 (2006).
8) L. Mourokh et al. Appl. Phys. Lett. 90, 132108-1-3 (2007).
9) S. Birner, P. Vogl, http://www.wsi.tum.de/nextnano3/tutorial/2Dtutorial_CoupledQWRsMagnetic.htm

Last modified:22 October 2012 2.30 p.m.