Magnetotransport Studies of the Single and Bilayer Two Dimensional Electron Gas in the Quantum Hall Regime PDF Download
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Author: Giovanni Maria Galistu
Publisher:
ISBN: 9789090254494
Category :
Languages : en
Pages : 129
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Author: Giovanni Maria Galistu
Publisher:
ISBN: 9789090254494
Category :
Languages : en
Pages : 129
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Book Description
Author: Girish Bohra
Publisher:
ISBN:
Category :
Languages : en
Pages : 59
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Book Description
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:
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 774
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Author: Marcin z Drozdowa Byszewski
Publisher:
ISBN:
Category :
Languages : en
Pages : 143
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Studies of properties of a two-dimensional electron gas in magnetic fields by optical spectroscopy is presented: fractional quantum Hall effect (FQHE) studied by photoluminescence and inelastic light scattering in high fields, and a recently discovered effect of microwave induced resistance oscillations (MIROs) by transport and absorption measurements in low fields. Until now, series of FQHE states, arising due to electron interaction, were not observed in photoluminescence. This work reports on optical detection of a whole family of 1/2 fractional states observed in photoluminescence. The features reflect pattern analogous to the one observed by the magneto--resistivity traces. The strongest features observed even in raw data include fractions 1/3, 2/5, 3/7, 3/5, 2/3 , and 1 on either side of the 1/2 state. The last chapter describes the studies of the new effect of microwave resistance induced oscillations (MIROs). When irradiated with microwaves, the behaviour of 2DEG transport properties deviates from the Shubnikov -- de Haas oscillations. The resistance traces exhibit series of vanishing resistance states. The frequency dependence of transport data shows a gradual changeover from transport traces reflecting MIROs in low microwave frequencies, to traces showing nearly the cyclotron resonance only. The results of the absorption measurements validate description of the MIROs as the result of oscillatory density of states. Also, the existence of two separate absorption processes are suggested to explain the microwave polarisation independence of MIROs, and the crossover from MIROs-like transport data at low frequencies to cyclotron--like traces at higher frequencies.
Author: Pedro Derosa
Publisher: CRC Press
ISBN: 1439810400
Category : Science
Languages : en
Pages : 310
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Book Description
While the relevant features and properties of nanosystems necessarily depend on nanoscopic details, their performance resides in the macroscopic world. To rationally develop and accurately predict performance of these systems we must tackle problems where multiple length and time scales are coupled. Rather than forcing a single modeling approach to
Author: Gottfried Landwehr
Publisher: Springer Science & Business Media
ISBN: 3642831141
Category : Science
Languages : en
Pages : 572
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Book Description
High magnetic fields have been an important tool in semiconductor physics for a long time. The area has been growing very rapidly since quantum effects in silicon field-effect transistors have become of practical interest. Since the discovery of the quantum Hall effect by Klaus von Klitzing in 1980, this subject has grown exponentially. The book contains 42 invited papers and 37 contributed papers which were presented at the 7th of the traditional Würzburg conferences. For the area of high magnetic fields applied in semiconductor physics recent results are discussed, and the state-of-the-art is reviewed. More than 50% of the papers concern two-dimensional electronic systems. Other subjects of current interest are magneto-optics and magneto transport in three-dimensional semiconductors. Special attention has been paid to the rapidly growing field of semimagnetic semiconductors.
Author: Gottfried Landwehr
Publisher: Springer Science & Business Media
ISBN: 3642838103
Category : Technology & Engineering
Languages : en
Pages : 666
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Book Description
This volume contains contributions presented at the International Conference "The Application of High Magnetic Fields in Semiconductor Physics", which was held at the University of Wiirzburg from August 22 to 26, 1988. In the tradition of previous Wiirzburg meetings on the subject - the first conference was held in 1972 - only invited papers were presented orally. All 42 lecturers were asked to review their subject to some extent so that this book gives a good overview of the present state of the respective topic. A look at the contents shows that the subjects which have been treated at previous conferences have not lost their relevance. On the contrary, the application of high magnetic fields to semiconductors has grown substantially during the recent past. For the elucidation of the electronic band structure of semicon ductors high magnetic fields are still an indispensable tool. The investigation of two-dimensional electronic systems especially is frequently connected with the use of high magnetic fields. The reason for this is that a high B-field adds angular momentum quantization to the boundary quantization present in het erostructures and superlattices. A glance at the contributions shows that the majority deal with 2D properties. Special emphasis was on the integral and fractional quantum Hall effect. Very recent results related to the observation of a fraction with an even denbminator were presented. It became obvious that the polarization of the different fractional Landau levels is more complicated than originally anticipated.
Author: Nihon Butsuri Gakkai
Publisher:
ISBN:
Category : Physics
Languages : en
Pages : 1390
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Author: Gavin Melhuish
Publisher:
ISBN:
Category :
Languages : en
Pages : 134
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Author: Dennis Theis Nicolaas de Lang
Publisher:
ISBN: 9789057761409
Category :
Languages : en
Pages : 180
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Book Description
