# Two-Temperature Model of non-equilibrium electron relaxation: A Review

Source: [Two-Temperature Model of non-equilibrium electron relaxation: A Review](<https://www.sota2.com/research/paper/68fa23752c2a376019397deb>)

Collection index: [llms.txt](<https://www.sota2.com/research/llms.txt>)

Data updated: 2025-10-24T06:54:02.896Z

Authors: Navinder Singh

Published: 2007-02-14T13:10:05.000Z

## Abstract

The present paper is a review of the phenomena related to non-equilibrium electron relaxation in bulk and nano-scale metallic samples. The workable Two-Temperature Model (TTM) based on Boltzmann-Bloch-Peierls (BBP) kinetic equation has been applied to study the ultra-fast(femto-second) electronic relaxation in various metallic systems. The advent of new ultra-fast (femto-second) laser technology and pump-probe spectroscopy has produced wealth of new results for micro and nano-scale electronic technology. The aim of this paper is to clarify the TTM, conditions of its validity and non-validity, its modifications for nano-systems, to sum-up the progress, and to point out open problems in this field. We also give a phenomenological integro-differential equation for the kinetics of non-degenerate electrons that goes beyond the TTM.

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## Original sources and implementation

[Original paper](<https://arxiv.org/abs/cond-mat/0702331>)

[PDF](<https://arxiv.org/pdf/cond-mat/0702331.pdf>)