Monte Carlo studies of thermalization of electron–hole pairs in spin-polarized degenerate electron gas in monolayer graphene

Piotr Borowik , Jean-Luc Thobel , Leszek Adamowicz

Abstract

Monte Carlo method is applied to the study of relaxation of excited electron–hole (e–h) pairs in graphene. The presence of background of spin-polarized electrons, with high density imposing degeneracy conditions, is assumed. To such system, a number of e–h pairs with spin polarization parallel or antiparallel to the background is injected. Two stages of relaxation: thermalization and cooling are clearly distinguished when average particles energy ⟨ E⟩ and its standard deviation σE are examined. At the very beginning of thermalization phase, holes loose energy to electrons, and after this process is substantially completed, particle distributions reorganize to take a Fermi–Dirac shape. To describe the evolution of ⟨ E⟩ and σE during thermalization, we define characteristic times τth and values at the end of thermalization Eth and σth. The dependence of these parameters on various conditions, such as temperature and background density, is presented. It is shown that among the considered parameters, only the standard deviation of electrons energy allows to distinguish between different cases of relative spin polarizations of background and excited electrons.

Author Piotr Borowik - [Politechnika Warszawska]
Piotr Borowik,,
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, Jean-Luc Thobel - [Universite des Sciences et Technologies de Lille]
Jean-Luc Thobel,,
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, Leszek Adamowicz (FP / SRD)
Leszek Adamowicz,,
- Structural Research Division
Journal seriesApplied Physics A-Materials Science & Processing, ISSN 0947-8396, (A 25 pkt)
Issue year2018
Vol124
ASJC Classification2500 General Materials Science; 1600 General Chemistry
DOIDOI:10.1007/s00339-018-1611-8
Languageen angielski
Score (nominal)30
ScoreMinisterial score = 25.0, 04-12-2018, ArticleFromJournal
Ministerial score (2013-2016) = 30.0, 04-12-2018, ArticleFromJournal
Publication indicators Scopus Citations = 0; Scopus SNIP (Source Normalised Impact per Paper): 2016 = 0.756; WoS Impact Factor: 2017 = 1.604 (2) - 2017=1.573 (5)
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