What lurks below the last plateau: experimental studies of the 0.7 × 2e(2)/h conductance anomaly in one-dimensional systems.
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In this article, a review report on experimental studies of fractionally quantized plateaus in semiconductor quantum point contacts and quantum wires, focusing on the 0.7 × 2e(2)/h conductance anomaly, its analogues at higher conductances and the zero-bias peak observed in the dc source-drain bias for conductances less than 2e (2) 2 /h.Abstract:
The integer quantised conductance of one-dimensional electron systems is a well-understood effect of quantum confinement. A number of fractionally quantised plateaus are also commonly observed. They are attributed to many-body effects, but their precise origin is still a matter of debate, having attracted considerable interest over the past 15 years. This review reports on experimental studies of fractionally quantised plateaus in semiconductor quantum point contacts and quantum wires, focusing on the 0.7 × 2e(2)/h conductance anomaly, its analogues at higher conductances and the zero-bias peak observed in the dc source-drain bias for conductances less than 2e(2)/h.read more
Citations
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Quantized Thermal Conductance of Dielectric Quantum Wires
Luis G. C. Rego,George Kirczenow +1 more
TL;DR: In this paper, the authors used the Landauer formulation of transport theory to predict that dielectric quantum wires should exhibit quantized thermal conductance at low temperatures in a ballistic phonon regime.
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A review of progress in the physics of open quantum systems: theory and experiment.
Ingrid Rotter,Jonathan P. Bird +1 more
TL;DR: A detailed discussion of the behavior of mesoscopic devices (and other OQSs) in terms of the projection-operator formalism, and discusses experiments on mesoscopic quantum point contacts that provide evidence of the environmentally-mediated coupling of quantum states.
Journal ArticleDOI
A review of progress in the physics of open quantum systems: theory and experiment
Ingrid Rotter,Jonathan P. Bird +1 more
TL;DR: In this paper, the authors provide a detailed discussion of the behavior of OQSs in terms of the projection operator formalism, according to which the system under study is considered to be comprised of a localized region, embedded into a well-defined environment of scattering wavefunctions (with $Q+P=1$).
Density dependent spin polarisation in ultra low-disorder quantum wires
David J. Reilly,T. M. Buehler,Jeremy L. O'Brien,Alex R. Hamilton,Andrew S. Dzurak,R. G. Clark,Bruce E. Kane,L. N. Pfeiffer,Ken W. West +8 more
TL;DR: In this paper, the authors present conductance measurements on ultra-low-disorder quantum wires supportive of a spin polarization at B = 0.5-0.7)x2e(2)/h in conductance data.
Journal Article
All-Electric Quantum Point Contact Spin Polarizer
TL;DR: Experimental evidence is presented that a quantum point contact -- a short wire -- made from a semiconductor with high intrinsic spin-orbit coupling can generate a completely spin-polarized current when its lateral confinement is made highly asymmetric.
References
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The interplay between one-dimensional confinement and two-dimensional crystallographic anisotropy effects in ballistic hole quantum wires
TL;DR: In this article, the Zeeman spin-splitting in hole quantum wires aligned along the and crystallographic axes of a high-mobility AlGaAs/GaAs heterostructure was studied.
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Compressibility measurements of quasi-one-dimensional quantum wires.
L. W. Smith,Alex R. Hamilton,Kalarikad Thomas,Michael Pepper,Ian Farrer,J. P. Griffiths,G. A. C. Jones,David A. Ritchie +7 more
TL;DR: Measurements of the compressibility of a one-dimensional quantum wire, defined in the upper well of a GaAs/AlGaAs double quantum well heterostructure see no evidence of the formation of the quasibound state predicted by the Kondo model, and are consistent with theories which predict that the 0.7 structure arises as a result of spontaneous spin polarization.
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Charge rearrangement and screening in a quantum point contact.
TL;DR: Screening due to mobile charges in the QPC is measured quantitatively, using a second point contact, and density functional calculations attribute the deviations to a combination of a diverging density of states at the opening of each one-dimensional mode and exchange interaction, which is strongest for the first mode.
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Ferromagnetically coupled magnetic impurities in a quantum point contact.
TL;DR: It is found that strongly localized states in the point contact appear when a new transverse conductance channel opens and longitudinal resonant level is formed due to momentum mismatch, which sheds light on the experimentally observed puzzling coexistence of Kondo correlation and spin filtering in a quantum point contact.
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Electric-field control of magnetization in biased semiconductor quantum wires and point contacts
TL;DR: The true origin of the 0.25 and 0.85 conductance features which have been observed in biased split-gatequantum wires and quantum point contacts in semiconductor heterostructures is debated in the liter...