منابع مشابه
Effective mass at the surface of a Fermi liquid
Using the dynamical mean-field theory, we calculate the effective electron mass in the Hubbard model on a semi-infinite lattice. At the surface the effective mass is strongly enhanced. Near half-filling this gives rise to a correlation-driven one-electron surface mode. ————————————————————————————————————————————————— Important characteristics of interacting electrons on a lattice can be studie...
متن کاملEffective Field Theory and the Fermi Surface
This is an introduction to the method of effective field theory. As an application, I derive the effective field theory of low energy excita-tions in a conductor, the Landau theory of Fermi liquids, and explain why the high-T c superconductors must be described by a different effective field theory. Lectures presented at TASI 1992.
متن کاملEffective mass and Fermi surface complexity factor from ab initio band structure calculations
The effective mass is a convenient descriptor of the electronic band structure used to characterize the density of states and electron transport based on a free electron model. While effective mass is an excellent first-order descriptor in real systems, the exact value can have several definitions, each of which describe a different aspect of electron transport. Here we use Boltzmann transport ...
متن کاملFermi surface of NaxCoO2.
Doping evolution of the Fermi surface topology of Na(x)CoO(2) is studied systematically. Both local density approximation (LDA) and local spin density approximation (LSDA) predict a large Fermi surface as well as small hole pockets for doping levels x approximately 0.5. In contrast, the hole pockets are completely absent for all doping levels within LSDA+U. More importantly, we find no violatio...
متن کاملAnomalous Chiral Fermi Surface
We provide a geometrical argument for the emergence of a Wess-Zumino-Witten (WZW) term in a Fermi surface threaded by a Berry curvature. In the presence of external fields, the gauged WZW term yields a chiral (triangle) anomaly for the fermionic current at the edge of the Fermi surface. Fermion number is conserved though since Berry curvatures occur always in pairs with opposite (monopole) char...
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ژورنال
عنوان ژورنال: Materia Japan
سال: 1994
ISSN: 1340-2625,1884-5843
DOI: 10.2320/materia.33.261