You are here

Hyperfine-induced spin relaxation of a diffusively moving carrier in low dimensions: Implications for spin transport in organic semiconductors

TitleHyperfine-induced spin relaxation of a diffusively moving carrier in low dimensions: Implications for spin transport in organic semiconductors
Publication TypeJournal Article
Year of Publication2015
AuthorsMkhitaryan, VV, Dobrovitski, VV
JournalPhysical Review B
Volume92
Pagination054204
Date Published08
Type of ArticleArticle
ISBN Number1098-0121
Accession NumberWOS:000362210600002
Keywordscharge-transport, depolarization, injection, lattices, magnetoresistance, monte-carlo-simulation, random-walks, room-temperature, solids, valve
Abstract

The hyperfine coupling between the spin of a charge carrier and the nuclear spin bath is a predominant channel for the carrier spin relaxation in many organic semiconductors. We theoretically investigate the hyperfine-induced spin relaxation of a carrier performing a random walk on a d-dimensional regular lattice, in a transport regime typical for organic semiconductors. We show that in d = 1 and 2, the time dependence of the space-integrated spin polarization P(t) is dominated by a superexponential decay, crossing over to a stretched-exponential tail at long times. The faster decay is attributed to multiple self-intersections (returns) of the random-walk trajectories, which occur more often in lower dimensions. We also show, analytically and numerically, that the returns lead to sensitivity of P(t) to external electric and magnetic fields, and this sensitivity strongly depends on dimensionality of the system (d = 1 versus d = 3). Furthermore, we investigate in detail the coordinate dependence of the time-integrated spin polarization sigma(r), which can be probed in the spin-transport experiments with spin-polarized electrodes. We demonstrate that, while sigma(r) is essentially exponential, the effect of multiple self-intersections can be identified in transport measurements from the strong dependence of the spin-decay length on the external magnetic and electric fields.

DOI10.1103/PhysRevB.92.054204
Custom 1

Photonics