Electronic structure of metals and semiconductors: bulk, surface, and interface properties
A theoretical study of the electronic structure of various metals and semiconductors is presented with the emphasis on understanding the properties of these materials when they are subjected to extreme conditions and in various different configurations. Among the bulk systems studied, the properties of cesium under high pressure are discussed in terms of the electronic structure calculated at various cell volumes using the pseudopotential method. Local fields or umklapp processes in semiconductors are studied within the random phase approximation (RPA). Specifically the dielectric response matrix epsilon/sub GG'/ (q = 0,omega) is evaluated numerically to determine the effects of local-field corrections in the optical spectrum of Si. Also, some comments on the excitonic mechanism of superconductivity are presented and the role of local fields is discussed. The pseudo-potential method is next extended to calculate the electronic structure of a transition metal Nb. The calculation is performed self-consistently with the use of a non-local ionic potential determined from atomic spectra. Finally the theory of the superconducting transition temperature T/sub c/ is discussed in the strong-coupling formulation of the BCS theory. The Eliashberg equations in the Matsubara representation are solved analytically and a general T/sub c/ equation is obtained. A new method is developed using pseudopotentials in a self-consistent manner to describe non-periodic systems. The method is applicable to localized configurations such as molecules, surfaces, impurities, vacancies, finite chains of atoms, adsorbates, and solid interfaces. Specific applications to surfaces, metal-semiconductor interfaces and vacancies are presented.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 7237265
- Report Number(s):
- LBL-5493; TRN: 77-004407
- Resource Relation:
- Other Information: Thesis
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ALUMINIUM
ELECTRONIC STRUCTURE
CESIUM
NIOBIUM
SEMICONDUCTOR MATERIALS
SILICON
VACANCIES
BAND THEORY
CRYSTAL MODELS
DIELECTRIC PROPERTIES
EQUATIONS
INTERFACES
PRESSURE DEPENDENCE
SCHOTTKY EFFECT
SURFACE PROPERTIES
TRANSITION TEMPERATURE
ALKALI METALS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
ELECTRICAL PROPERTIES
ELEMENTS
MATHEMATICAL MODELS
METALS
PHYSICAL PROPERTIES
POINT DEFECTS
REFRACTORY METALS
SEMIMETALS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENTS
360602* - Other Materials- Structure & Phase Studies
360102 - Metals & Alloys- Structure & Phase Studies