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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Phase coherence, interference, and conductance quantization in a confined two-dimensional hole gas.
I. Zailer,J. E. F. Frost,C. J. B. Ford,Michael Pepper,Michelle Y. Simmons,David A. Ritchie,J. T. Nicholls,G. A. C. Jones +7 more
TL;DR: In this paper, a system of two parallel constrictions in a two-dimensional hole gas has been studied, and at zero magnetic-field conductance quantization is observed through the individual constrictionions.
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Temperature dependence of the ``0.7'' 2(e^2)/h quasi plateau in strongly confined quantum point contacts
Anders Kristensen,Poul Erik Lindelof,J.B. Jensen,M. Zaffalon,J. Hollingbery,S.W. Pedersen,Jesper Nygård,Henrik Bruus,S.M. Reimann,C.B. Sorensen M. Michel,Alfred Forchel +10 more
TL;DR: In this paper, the authors present new results of the 0.7'' 2(e^2)/h structure or quasi plateau in some of the most strongly confined point contacts so far reported.
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Evidence for localization and 0.7 anomaly in hole quantum point contacts
Yashar Komijani,M. Csontos,Ivan Shorubalko,Ivan Shorubalko,Thomas Ihn,Klaus Ensslin,Yigal Meir,Dirk Reuter,Andreas D. Wieck +8 more
TL;DR: In this article, the evolution of the 0.7 plateau in high perpendicular magnetic field reveals the existence of a quasi-localized state and is consistent with the explanation of the self-consistent charge localization.
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Boundary-mediated electron-electron interactions in quantum point contacts.
V T Renard,O. A. Tkachenko,V. A. Tkachenko,Takeshi Ota,Norio Kumada,J. C. Portal,J. C. Portal,Yoshiro Hirayama +7 more
TL;DR: An unusual increase of the conductance with temperature is observed in clean quantum point contacts for conductances larger than 2(e2/h) and at the same time, a positive magnetoresistance arises at high temperatures.
Journal ArticleDOI
Zero-bias anomaly of quantum point contacts in the low-conductance limit
TL;DR: In this article, the magnetic field and temperature dependencies of the zero-bias peak in the low-conductance limit are qualitatively different from the analogous phenomenology at higher conductance with implications for existing theoretical models of transport in low-density QPCs.