Density-Functional Theory of a Two-Dimensional Charge-Density-Wave State in a Strong Magnetic Field PDF Download
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Author: C. S. Wang
Publisher:
ISBN:
Category :
Languages : en
Pages : 4
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Book Description
Results are presented for the ground-state energies of a two-dimensional charge-density-wave state in a strong uniform magnetic field. The effects of exchange and correlation are included within the local-density approximation to the density-functional theory. Comparison with other theoretical calculations indicates that there is an explicit magnetic field dependence of the correlation energy due to electron localization. (Author).
Author: C. S. Wang
Publisher:
ISBN:
Category :
Languages : en
Pages : 4
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Book Description
Results are presented for the ground-state energies of a two-dimensional charge-density-wave state in a strong uniform magnetic field. The effects of exchange and correlation are included within the local-density approximation to the density-functional theory. Comparison with other theoretical calculations indicates that there is an explicit magnetic field dependence of the correlation energy due to electron localization. (Author).
Author: Maurizio Ferconi
Publisher:
ISBN:
Category : Electronic structure
Languages : en
Pages : 280
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Book Description
Most of the work done in the physics of two-dimensional structures is either limited by the size of the systems that are studied due to the use of exact diagonalization techniques which do not allow to go beyond structures with only few electrons, or by other methods which do not include exchange-correlation effects, or correlation effects only. There are instances in which these effects cannot be neglected. In order to fill this gap we decided to use a density functional approach, which proved to be reliable in other problems. In Chapter 3 I shall present original results on the study of the ground-state properties of quantum dots in the presence of a magnetic field of arbitrary strength obtained within a current-density functional approach. The results obtained agree very well with those obtained by means of exact diagonalization approaches. In the regime not accessible by the latter methods we show how important are exchange-correlation effects, and we also make an analysis of correlation effects, by comparison with Hartree-Fock results. In Chapter 4 we address and study the density profile at the edge of a confined two-dimensional electron gas in the fractional quantum Hall regime. The strong correlation effects are accounted for in a density functional approach. I show that there exists a transition between two regimes as a function of the smoothness of the confining potential. In Chapter 5, we study the magnetophonon dispersion relations of a two-dimensional Wigner crystal in the presence of a strong magnetic field, and of its shear modulus, that we derived within a density functional scheme, that therefore includes correlation effects, and has the advantage of being analytical. In Chapter 6 I present a theory for the calculation of the pinning gap and magnetophonon spectrum of a disordered Wigner crystal. Its main feature resides in the inclusion in the pinning energy of the contribution arising from distortions of the crystal on all length scales.
Author: K. Ploog
Publisher: Springer Science & Business Media
ISBN: 3642695809
Category : Science
Languages : en
Pages : 221
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Book Description
Epitaxial growth and electronic properties of semiconductor thin films are becoming increasingly important for fundamental and applied research and for device applications. This book contains a comprehensive collection of over 1500 references covering the first 25 years of molecular beam epitaxy of III-V compound semiconductors. Molecular beam epitaxy is a versatile thin film growth technique which emerged from the 'Three-temperature method' de veloped in the 1950s and from surface kinetic studies performed in the 1960s. III-V semiconductors such as GaAs, AlAs, (Galn)As, InP, etc., play an important role in the application to optoelectronic and high-speed devices. Over the past three years the technology of molecular beam epitaxy has spread rapidly to most major research and development laboratories through out the world, and an increasing number of highly refined III-V semiconduc tor structures with exactly tailored electronic properties have been pro duced and explored for fundamental studies as well as for device appl ica tion. The comprehensive bibliography on this dramatically expanding topic helps chemists, engineers, materials scientists, and physicists working in semiconductor research and development areas to sort out the important lit erature of their particular interest. A direct reproduction of the output of a computer printer has been used to enable rapid publication and to keep printing costs low. The work was sponsored by the 'Bundesministerium fUr Forschung und Technologie' of the Federal Republic of Germany. Stuttgart, January 1984 K. Ploog . K. Graf Subject Categories and References Introduction ... Year 1977 ...
Author: Jenö Sólyom
Publisher: Springer Science & Business Media
ISBN: 3642045189
Category : Science
Languages : en
Pages : 764
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Book Description
This book is the third of a three-volume series written by the same author. It aims to deliver a comprehensive and self-contained account of the fundamentals of the physics of solids. In the presentation of the properties and experimentally observed phenomena together with the basic concepts and theoretical methods, it goes far beyond most classic texts. The essential features of various experimental techniques are also explained. This volume is devoted mostly to the discussion of the effects of electron—electron interaction beyond the one-electron approximation. The density-functional theory is introduced to account for correlation effects. The response to external perturbations is discussed in the framework of linear response theory. Landau’s Fermi-liquid theory is followed by the theory of Luttinger liquids. The subsequent chapters are devoted to electronic phases with broken symmetry: to itinerant magnetism, to spin- and charge-density waves and their realizations in quasi-one-dimensional materials, as well as to the microscopic theory of superconductivity. An overview is given of the physics of strongly correlated systems. The last chapter covers selected problems in the physics of disordered systems.
Author: John Robert Schrieffer
Publisher: World Scientific
ISBN: 9789812380791
Category : Science
Languages : en
Pages : 528
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Book Description
Presents papers by theoretical physicist J. Robert Schrieffer on topics in superconductivity and condensed matter physics.
Author: Peter A. Ling
Publisher: Nova Publishers
ISBN: 9781594544064
Category : Science
Languages : en
Pages : 278
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Book Description
A quantum dot is a particle of matter so small that the addition or removal of an electron changes its properties in some useful way. All atoms are quantum dots, but multi-molecular combinations can have this characteristic. In biochemistry, quantum dots are called redox groups. In nanotechnology, they are called quantum bits or qubits. Quantum dots typically have dimensions measured in nanometers, where one nanometer is 10-9 meter or a millionth of a millimetre. The fields of biology, chemistry, computer science, and electronics are all of interest to researchers in nanotechnology. Other applications of quantum dots include nanomachines, neural networks, and high-density memory or storage media. Research is being carried out on nano-crystals, self-assembled dots, and gated structures. This book presents leading-edge research from around the world.
Author:
Publisher:
ISBN:
Category : Power resources
Languages : en
Pages : 490
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Book Description
Author: George Gruner
Publisher: CRC Press
ISBN: 0429969562
Category : Science
Languages : en
Pages : 288
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Book Description
?Density Waves in Solids is written for graduate students and scientists interested in solid-state sciences. It discusses the theoretical and experimental state of affairs of two novel types of broken symmetry ground states of metals, charge, and spin density waves. These states arise as the consequence of electron-phonon and electron-electron interactions in low-dimensional metals.Some fundamental aspects of the one-dimensional electron gas, and of the materials with anisotropic properties, are discussed first. This is followed by the mean field theory of the phases transitions?discussed using second quantized formalism?together with the various experimental observations on the transition and on the ground states. Fluctuation effects and the collective excitations are reviewed next, using the Ginzburg-Landau formalism, followed by the review of the interaction of these states with the underlying lattice and with impurities. The final chapters are devoted to the response of the ground states to external perturbations.
Author:
Publisher:
ISBN:
Category : Physics
Languages : en
Pages : 1288
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Book Description
Author: Noboru Miura
Publisher: Oxford University Press
ISBN: 0198517564
Category : Science
Languages : en
Pages : 373
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Book Description
This book summarizes most of the fundamental physical phenomena which semiconductors and their modulated structures exhibit in high magnetic fields. Readers can learn not only the basic theoretical background but also the present state of the art from the most advanced data in this rapidly growing research area.
