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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Semiconductor quantum point contact fabricated by lithography with an atomic force microscope
TL;DR: In this paper, the experimental realization of a quantum point contact in a semiconductor heterostructure by lithography with an atomic force microscope (AFM) was reported. But it was only applied to the sub-micron regime.
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First-Order Phase Transition in a Quantum Hall Ferromagnet
Vincenzo Piazza,Vittorio Pellegrini,Fabio Beltram,Werner Wegscheider,Tomas Jungwirth,Allan H. MacDonald +5 more
TL;DR: In this article, the first-order phase transitions in n = 2 and 4 quantum Hall states confined to a wide gallium arsenide quantum well were studied and the observed hysteretic behaviour and anomalous temperature dependence in the longitudinal resistivity indicate the occurrence of a transition between the two distinct ground states of an Ising quantum-Hall ferromagnet.
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Noisy Kondo impurities
Thomas Delattre,Thomas Delattre,Cheryl Feuillet-Palma,Cheryl Feuillet-Palma,L. G. Herrmann,L. G. Herrmann,Pascal Morfin,Pascal Morfin,Jean-Marc Berroir,Jean-Marc Berroir,Gwendal Fève,Gwendal Fève,Bernard Plaçais,Bernard Plaçais,D. C. Glattli,D. C. Glattli,Mahn Soo Choi,Christophe Mora,Christophe Mora,Takis Kontos,Takis Kontos +20 more
TL;DR: In this paper, sensitive measurements of fluctuations in the current through carbon-nanotube-based quantum dots provide insight into the many-body physics of such systems, and they are used to obtain the state-of-the-art quantum dot detectors.
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Quantised thermopower of a channel in the ballistic regime
TL;DR: In this paper, it was shown that the quantised nature of the ballistic conductance in a narrow channel leads to the peak structure of the thermopower with quantised values of local maxima.
Journal ArticleDOI
First-order phase transitions in a quantum Hall ferromagnet
Vincenzo Piazza,Vittorio Pellegrini,Fabio Beltram,Werner Wegscheider,Tomas Jungwirth,Allan H. MacDonald +5 more
TL;DR: In this article, first-order phase transitions in quantum Hall states (ν = 2,4) confined to a wide gallium arsenide quantum well have been observed, indicating a transition between two distinct ground states of an Ising quantum Hall ferromagnet.