Magnetotransport Studies of Artificially Disordered Two-dimensional Electron Gases PDF Download
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Author: Gavin Melhuish
Publisher:
ISBN:
Category :
Languages : en
Pages : 134
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Author: Gavin Melhuish
Publisher:
ISBN:
Category :
Languages : en
Pages : 134
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Author: Giovanni Maria Galistu
Publisher:
ISBN: 9789090254494
Category :
Languages : en
Pages : 129
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Author: Girish Bohra
Publisher:
ISBN:
Category :
Languages : en
Pages : 59
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This thesis is focused on an experimental study of the electrical properties of a two-dimensional electron gas formed in a GaAs/AlGaAs heterostructure. Low temperature magneto-transport measurements are used to characterize the carrier density and mobility of this system. An extensive study of the temperature and current dependence of quantum-mechanical transport effects, observable at very low temperatures, is performed in the temperature range of 4.2-100 K, for measurement currents in the range of 10 nA- 100℗æA. The well-known decrease in the amplitude of the Shubnikov-de Haas effect, and an accompanying increase in the onset magnetic field of these oscillations, with increasing temperature, as well as a simultaneous suppression of the quantum-Hall effect, is observed. Similar behavior is found on increasing the measurement current. An analysis of the insulator to quantum Hall transition (I-QH), occurring in the two-dimensional electron gas at low perpendicular magnetic fields, is also reported, along with the results of investigations of electron heating based on the measurements of the energy-loss rate. This study shows that the direct I-QH transition does not always correspond to the onset of strong localization, with clear Shubnikov-de Haas oscillations being observed in the insulating regime. A linear dependence of the electron energy-loss rate and electron temperature in the temperature range of 4.2-40 K is determined, indicating that the main mechanism for electron energy relaxation is acoustic phonon scattering.
Author: Masahiro Hara
Publisher:
ISBN:
Category :
Languages : en
Pages : 9
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Author: Tigran V. Chakhbazian
Publisher:
ISBN:
Category : Magnetic fields
Languages : en
Pages : 272
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: M. A. Brummell
Publisher:
ISBN:
Category : Magnetic fields
Languages : en
Pages : 504
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Author: Jeffrey Maurice Heisz
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Jainendra K. Jain
Publisher: Cambridge University Press
ISBN: 1139462644
Category : Science
Languages : en
Pages : 561
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Book Description
This book was first published in 2007. When electrons are confined to two dimensions, cooled to near absolute zero temperature, and subjected to a strong magnetic field, they form an exotic new collective state of matter. Investigations into this began with the observations of integral and fractional quantum Hall effects, which are among the most important discoveries in condensed matter physics. The fractional quantum Hall effect and a stream of other unexpected findings are explained by a new class of particles: composite fermions. This textbook is a self-contained, pedagogical introduction to the physics and experimental manifestations of composite fermions. Ideal for graduate students and academic researchers, it contains numerous exercises to reinforce the concepts presented. The topics covered include the integral and fractional quantum Hall effects, the composite-fermion Fermi sea, various kinds of excitations, the role of spin, edge state transport, electron solid, bilayer physics, fractional braiding statistics and fractional local charge.
Author: Andrew William Rushforth
Publisher:
ISBN:
Category :
Languages : en
Pages :
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