Possible Spin Polarization in a One-Dimensional Electron Gas.
Kalarikad Thomas,J. T. Nicholls,Michelle Y. Simmons,Michael Pepper,D. R. Mace,David A. Ritchie +5 more
Reads0
Chats0
TLDR
The measured enhancement of the $g$ factor as the subbands are depopulated suggests that the ``0.7 structure'' is induced by electron-electron interactions.Abstract:
In zero magnetic field, conductance measurements of clean one-dimensional (1D) constrictions defined in GaAs/AlGaAs heterostructures show up to 26 quantized ballistic plateaus, as well as a structure close to $0.7({2e}^{2}/h)$. In an in-plane magnetic field all the 1D subbands show linear Zeeman splitting, and in the wide channel limit the $g$ factor is $\ensuremath{\mid}g\ensuremath{\mid}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}0.4$, close to that of bulk GaAs. For the last subband, spin splitting originates from the structure at $0.7({2e}^{2}/h)$, indicating spin polarization at $B\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}0$. The measured enhancement of the $g$ factor as the subbands are depopulated suggests that the ``0.7 structure'' is induced by electron-electron interactions.read more
Citations
More filters
Journal ArticleDOI
One-dimensional hole gas in germanium/silicon nanowire heterostructures
TL;DR: The synthesis and transport studies of a 1D hole gas system based on a free-standing germanium/silicon (Ge/Si) core/shell nanowire heterostructure are reported and a "0.7 structure" is observed, suggesting the universality of this phenomenon in interacting 1D systems.
Journal ArticleDOI
All-electric all-semiconductor spin field-effect transistors
Pojen Chuang,Sheng-Chin Ho,L. W. Smith,Francois Sfigakis,Michael Pepper,Chin-Hung Chen,Ju-Chun Fan,J. Griffiths,Ian Farrer,Harvey E. Beere,Gac Jones,David A. Ritchie,T-M Chen +12 more
TL;DR: An all-electric and all-semiconductor spin field-effect transistor in which distinct engineering architectures of spin-orbit coupling are exploited for the quantum point contacts and the central semiconductor channel to achieve complete control of the electron spins in a purely electrical manner.
Journal ArticleDOI
Spin-charge separation and localization in one dimension.
Ophir M. Auslaender,Ophir M. Auslaender,Ophir M. Auslaender,Hadar Steinberg,Hadar Steinberg,Hadar Steinberg,Amir Yacoby,Amir Yacoby,Amir Yacoby,Yaroslav Tserkovnyak,Yaroslav Tserkovnyak,Yaroslav Tserkovnyak,Bertrand I. Halperin,Bertrand I. Halperin,Bertrand I. Halperin,K. W. Baldwin,K. W. Baldwin,K. W. Baldwin,Loren N. Pfeiffer,Loren N. Pfeiffer,Loren N. Pfeiffer,K. W. West,K. W. West,K. W. West +23 more
TL;DR: In this article, measurements of quantum many-body modes in ballistic wires and their dependence on Coulomb interactions, obtained by tunneling between two parallel wires in an GaAs/AlGaAs heterostructure while varying electron density, were reported.
Journal ArticleDOI
Quantized conductance of a suspended graphene nanoconstriction
N. Tombros,A. Veligura,Juliane Junesch,Marcos H. D. Guimarães,Ivan J. Vera-Marun,Harry T. Jonkman,Bart J. van Wees +6 more
TL;DR: In this article, conductance quantization of the current flowing across a nanometre-scale constriction in graphene has been demonstrated by using high-quality suspended samples and a constriction whose length is shorter than its width.