Spin independence of the strongly enhanced effective mass in ultra-clean SiGe/Si/SiGe two-dimensional electron system

Autor:	M. Yu. Melnikov, A. A. Shakirov, A. A. Shashkin, S. H. Huang, C. W. Liu, S. V. Kravchenko
Jazyk:	angličtina
Rok vydání:	2023
Předmět:	Medicine Science
Zdroj:	Scientific Reports, Vol 13, Iss 1, Pp 1-6 (2023)
Druh dokumentu:	article
ISSN:	2045-2322
DOI:	10.1038/s41598-023-44580-y
Popis:	Abstract The effective mass at the Fermi level is measured in the strongly interacting two-dimensional (2D) electron system in ultra-clean SiGe/Si/SiGe quantum wells in the low-temperature limit in tilted magnetic fields. At low electron densities, the effective mass is found to be strongly enhanced and independent of the degree of spin polarization, which indicates that the mass enhancement is not related to the electrons’ spins. The observed effect turns out to be universal for silicon-based 2D electron systems, regardless of random potential, and cannot be explained by existing theories.
Databáze:	Directory of Open Access Journals
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