Nuclear spin relaxation in n-GaAs: from insulating to metallic regime

Autor:	Vladimirova, M., Cronenberger, S., Scalbert, D., Kotur, M., Dzhioev, R. I., Ryzhov, I. I., Kozlov, G. G., Zapasskii, V. S., Lemaître, A., Kavokin, K. V.
Rok vydání:	2016
Předmět:	Condensed Matter - Mesoscale and Nanoscale Physics Condensed Matter - Other Condensed Matter
Zdroj:	Phys. Rev. B 95, 125312 (2017)
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevB.95.125312
Popis:	Nuclear spin relaxation is studied in n-GaAs thick layers and microcavity samples with different electron densities. We reveal that both in metallic samples where electrons are free and mobile, and in insulating samples, where electrons are localized, nuclear spin relaxation is strongly enhanced at low magnetic field. The origin of this effect could reside in the quadrupole interaction between nuclei and fluctuating electron charges, that has been proposed to drive nuclear spin dynamics at low magnetic fields in the insulating samples. The characteristic values of these magnetic fields are given by dipole-dipole interaction between nuclei in bulk samples, and are greatly enhanced in microcavities, presumably due to additional strain, inherent to micro and nanostructures. Comment: 11 pages, 4 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1612.01699 Zobrazit plný text záznamu View this record from Arxiv