[PDF]    http://dx.doi.org/10.3952/lithjphys.45304

Open access article / Atviros prieigos straipsnis

Lith. J. Phys. 45, 183–189 (2005)
Corrected digital version. Erratum in print: Lith. J. Phys. 45, 411–412 (2005), http://dx.doi.org/10.3952/lithjphys.45515


DEFORMATION POTENTIAL LIMITED SPIN RELAXATION IN CUBIC SEMICONDUCTORS ∗
A. Dargys
Semiconductor Physics Institute, A. Goštauto 11, LT-01108 Vilnius, Lithuania
E-mail: dargys@pfi.lt

Received 13 April 2005

The scattering of valence band hole spin by acoustical and optical phonons due to deformation potential interaction is considered. Six-band deformation potential matrix, which takes into account doubly degenerate heavy-mass, light-mass, and split-off energy bands, is used to evaluate the matrix elements for spin conserving and flipping transitions. The concept of the spin surface was addressed to define the initial and final states of the hole spin. It was found that, in agreement with experiment, the spin conserving and flipping transitions are of comparable magnitude in both intravalence and intervalence band scattering mediated by acoustical as well as optical phonons.
Keywords: spintronics, spin relaxation, spin dephasing, hole spin, deformation potential scattering
PACS: 85.75.-d, 72.25.Rb, 67.57.Lm
∗ The report presented at the 36th Lithuanian National Physics Conference, 16–18 June 2005, Vilnius, Lithuania


DEFORMACINIO POTENCIALO SĄLYGOTA SUKINIO RELAKSACIJA KUBINIUOSE PUSLAIDININKIUOSE
A. Dargys
Puslaidininkių fizikos institutas, Vilnius, Lietuva

Trumpai apžvelgta laisvųjų krūvininkų sukinio relaksacija puslaidininkiuose. Aptartas naujas sukinio gyvavimo trukmės skaičiavimo būdas, grindžiamas sukinio paviršiaus koncepcija [11–13]. Sukinio paviršius apibūdina visas įmanomas sukinio poliarizacijas, kai elektronas arba skylė balistiškai juda vienoje iš energinių juostų. Žinant laisvojo krūvininko sukinio paviršių, lengva parinkti spinoriaus parametrus prieš ir po sklaidos, kuriuos būtina žinoti, skaičiuojant su sukiniu susietus matricinius sklaidos elementus. Kiek smulkiau aptarta skylės sukinio relaksacija p tipo puslaidininkiuose, kai skylė sąveikauja su akustiniais ir optiniais fononais per deformacinį potencialą. Parodyta, kad dėl stiprios sukinio ir orbitos sąveikos, kuri būdinga elementariųjų puslaidininkių bei III–V, II–VI junginių valentinėms juostoms, skylės sukinio apvertimo tikimybė po susidūrimo su fononu yra didelė. Tai patvirtinta ir eksperimentu. Pateikta sukinio sklaidos matricinių elementų priklausomybė nuo skylės bangos skaičiaus GaAs atveju.


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