Publication

The spectroscopic properties of 1D Peierls systems

Giorgio Margaritondo, Helmuth Berger, Marco Grioni, Luca Perfetti
2001
Journal Articles

Abstract

We have studied by high resolution ARPES the spectroscopic properties of the prototype charge density wave system (TaSe4)(2)I and of the closely related insulating compound (NbSe4)(3)I. We observe features dispersing with the lattice periodicity, including commensurate (in (NbSe4)(3)I) and incommensurate (in (TaSe4)(2)I) superlattice shadow bands. The spectral lineshape is anomalous in the normal metallic state, and the intensity is strongly suppressed near the Fermi surface. In the insulating CDW state the linear extrapolation of the leading edge rather than the peak position identifies the gap energy scale. (C) 2001 Elsevier Science B.V; All rights reserved.

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https://infoscience.epfl.ch/entities/publication/7a81ed23-1176-44e0-a583-312fe9043081

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Giorgio Margaritondo, Helmuth Berger, Marco Grioni, Luca Perfetti
2001
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/7a81ed23-1176-44e0-a583-312fe9043081

About this result

Related concepts (32)

Fermi surface

In condensed matter physics, the Fermi surface is the surface in reciprocal space which separates occupied from unoccupied electron states at zero temperature. The shape of the Fermi surface is derived from the periodicity and symmetry of the crystalline lattice and from the occupation of electronic energy bands. The existence of a Fermi surface is a direct consequence of the Pauli exclusion principle, which allows a maximum of one electron per quantum state. The study of the Fermi surfaces of materials is called fermiology.

Fermi gas

A Fermi gas is an idealized model, an ensemble of many non-interacting fermions. Fermions are particles that obey Fermi–Dirac statistics, like electrons, protons, and neutrons, and, in general, particles with half-integer spin. These statistics determine the energy distribution of fermions in a Fermi gas in thermal equilibrium, and is characterized by their number density, temperature, and the set of available energy states. The model is named after the Italian physicist Enrico Fermi.

Fermi energy

The Fermi energy is a concept in quantum mechanics usually referring to the energy difference between the highest and lowest occupied single-particle states in a quantum system of non-interacting fermions at absolute zero temperature. In a Fermi gas, the lowest occupied state is taken to have zero kinetic energy, whereas in a metal, the lowest occupied state is typically taken to mean the bottom of the conduction band. The term "Fermi energy" is often used to refer to a different yet closely related concept, the Fermi level (also called electrochemical potential).

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The spectroscopic properties of 1D Peierls systems

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