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Electron waveguide interferometers for spin‐dependent transport experiments (Phys. Status Solidi B 9/2014)
Author(s) -
Chiatti Olivio,
Buchholz Sven S.,
Kunze Ulrich,
Reuter Dirk,
Wieck Andreas D.,
Fischer Saskia F.
Publication year - 2014
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201470154
Subject(s) - electron , physics , heterojunction , condensed matter physics , spin (aerodynamics) , quantum point contact , conductance , quantum , waveguide , atomic physics , quantum mechanics , quantum well , laser , thermodynamics
The Feature Article by Chiatti et al. (pp. 1753–1763 ) presents the state‐of‐the‐art of quasi‐one‐dimensional quantum point contacts (QPCs), extended electron waveguide (EWG) structures and Aharonov‐Bohm (AB) interferometers, fabricated in GaAs/ AlGaAs heterostructures. Etched QPCs have large subband spacings and, in the non‐linear transport regime, show a resonant enhancement of the differential conductance, which can be explained by a many‐body modification of the barrier potential, due to exchange‐induced spin correlations of itinerant electrons. QPCs and multi‐terminal asymmetric AB rings can be combined to form extended EWGs, where electrons are transmitted only through a few modes. The QPCs in the leads can be used as mode‐filters, allowing the injection of coherent electrons into the AB ring. AB conductance oscillations are used to demonstrate electrostatic control of transmission phase and to investigate decoherence due to measurement configuration and non‐equilibrium. These results encourage the investigation of spin‐dependent quantum transport in extended EWG interferometers, for example by embedding quantum dots to study mode‐dependent interactions and spin effects.