Lithuanian Journal of Physics article / Lietuvos fizikos žurnalo straipsnis

PHONON-ASSISTED KINETICS OF ELECTRON-HOLE PAIR IN TWO-BAND MODEL
Eriks Klotins
Institute of Solid State Physics, University of Latvia, Kengaraga 8, LV-1063 Riga, Latvia
E-mail: klotins@cfi.lu.lv

Received 5 May 2014; revised 10 June 2014; accepted 23 September 2014

Photoexcited kinetics of electrons and holes in two-band dielectric including phonon-assisted generation of the electron-hole pair is modelled by combining the quantum field and solid-state band theory. These methods create an explicit time-domain representation of photoinduced processes without resorting to the perturbation theory for the electromagnetic field. Input entities for the two-band model are dispersion relations for the electron and hole, the band-gap, and the phonon frequencies computed by nonrelativistic methods or found experimentally. The phonon-assisted electron-hole pair kinetics is initiated by the Baker-Campbell-Hausdorff canonical transformation accounting for the back reaction of phonons to the electron-hole subsystem. The output is a unifying phonon-assisted description of the distribution function of electron and hole quasiparticles.

Keywords: two-band model, electron-hole excitation, Baker-Campbell-Hausdorf canonical transformation
PACS: 71.15.Rf, 63.20.kd, 42.50.Ct

FONONŲ PALAIKOMA ELEKTRONŲ IR VAKANSIJŲ PORŲ SUSIDARYMO KINETIKA DVIEJŲ JUOSTŲ MODELYJE

Ēriks Klotiņš
Latvijos universiteto Kietojo kūno fizikos institutas, Ryga, Latvija

Šiame darbe pateikiami mūsų tyrimų rezultatai, formuojant stačiakampio skerspjūvio kanalus tūriniame lydytame kvarce. Selektyvus cheminis ėsdinimas kvarce buvo inicijuojamas apšvita femtosekundiniu lazeriu. Lazeriu modifikuotos bandinio sritys buvo lokaliai išėsdinamos fluoro rūgštimi. Pasiūlytas naujas metodas mikrokanalų su norimu skerspjūviu formavimui, panaudojant daugkartinį kanalo skenavimą. Buvo ištirta cheminio ėsdinimo selektyvumo priklausomybė nuo lazerio spindulio skenavimo greičio, lazerio impulso energijos ir poliarizacijos ir aptariami galimi modifikavimo procesai, sukeliantys nemonotonišką selektyvumo kitimą.

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