The thermodynamics of a charged fermion layer at high rs values

Autor:	Uri Sivan, E. I. Buchstab, M. A. Tischler, S. Shapira, Paul M. Solomon, G. Ben Yoseph
Rok vydání:	1996
Předmět:	Condensed matter physics Chemistry Degenerate energy levels Fermi energy Surfaces and Interfaces Interaction energy Condensed Matter Physics Ideal gas Surfaces Coatings and Films Materials Chemistry Coulomb Compressibility Compressibility factor Order of magnitude
Zdroj:	Surface Science. :113-116
ISSN:	0039-6028
DOI:	10.1016/0039-6028(96)00345-7
Popis:	We report the measurement of the chemical potential of a two-dimensional hole layer in wide temperature and density ranges. Due to their heavy mass, the holes are in a regime where the ratio of Coulomb to Fermi energies r s is very high, thus facilitating the first detailed study of the full temperature-dependent crossover from the strongly interacting degenerate regime to the classical ideal gas limit. The measured low-temperature chemical potential and inverse compressibility are negative and uninfluenced by temperature. At T ≈ 17K they simultaneously and abruptly become temperature-dependent for all carrier concentrations. As the temperature is further raised, the inverse compressibility becomes less negative and reverses sign. An ideal classical gas behavior is attained only at temperatures of the order of the interaction energy, more than an order of magnitude larger than the Fermi energy.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::d31f37f500edae6ca2e8dead18415736 https://doi.org/10.1016/0039-6028(96)00345-7 Zobrazit plný text záznamu Full Text from ScienceDirect