Publication

Spectroscopic indications of polaronic carriers in the quasi-one-dimensional conductor (TaSe4)(2)I

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

Abstract

Angle-resolved photoemission (ARPES) on the quasi-one-dimensional conductor (TaSe4)(2)I shows a hidden Fermi-surface crossing in its metallic state and the opening of a Peierls gap at low temperatures, The underlying quasiparticles have vanishing spectral weight and extremely short coherence lengths. They are interpreted as polarons in the strong-coupling adiabatic Lin-Lit, and almost all their ARPES weight is incoherent. These observations suggest a scenario where the long-standing contradictions between ARPES and other experiments on Peierls materials could be resolved.

Official source

https://infoscience.epfl.ch/entities/publication/b63d4265-9086-4af4-9275-ea963b2cbb50

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

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/b63d4265-9086-4af4-9275-ea963b2cbb50

About this result

Related concepts (24)

Angle-resolved photoemission spectroscopy

Angle-resolved photoemission spectroscopy (ARPES) is an experimental technique used in condensed matter physics to probe the allowed energies and momenta of the electrons in a material, usually a crystalline solid. It is based on the photoelectric effect, in which an incoming photon of sufficient energy ejects an electron from the surface of a material. By directly measuring the kinetic energy and emission angle distributions of the emitted photoelectrons, the technique can map the electronic band structure and Fermi surfaces.

Strongly correlated material

Strongly correlated materials are a wide class of compounds that include insulators and electronic materials, and show unusual (often technologically useful) electronic and magnetic properties, such as metal-insulator transitions, heavy fermion behavior, half-metallicity, and spin-charge separation. The essential feature that defines these materials is that the behavior of their electrons or spinons cannot be described effectively in terms of non-interacting entities.

Polaron

A polaron is a quasiparticle used in condensed matter physics to understand the interactions between electrons and atoms in a solid material. The polaron concept was proposed by Lev Landau in 1933 and Solomon Pekar in 1946 to describe an electron moving in a dielectric crystal where the atoms displace from their equilibrium positions to effectively screen the charge of an electron, known as a phonon cloud. This lowers the electron mobility and increases the electron's effective mass.

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Spectroscopic indications of polaronic carriers in the quasi-one-dimensional conductor (TaSe4)(2)I

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