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Coulomb correlation gap: Finite-size analysis
KTH, Superseded Departments, Physics.ORCID iD: 0000-0002-2076-5911
2001 (English)In: Physics Letters A, ISSN 0375-9601, E-ISSN 1873-2429, Vol. 287, no 04-mar, 278-282 p.Article in journal (Refereed) Published
Abstract [en]

A semiclassical model with randomly distributed N donor and K x N acceptor sites and with infinite-range Coulomb interaction is investigated by means of computer simulations on two-dimensional samples of different sizes. The shape of the Coulomb correlation gap in the density of one-electron excitations g(epsilon) is obtained for different values of K within a wide energy interval around the Fermi energy mu. Using simple scaling arguments we demonstrate that the true behavior of g(epsilon) in the immediate neighborhood of mu is hidden by the finite-size effects and find that g(epsilon) further away from mu is described by a power-law with an exponent, depending on K and the sign of epsilon - mu.

Place, publisher, year, edition, pages
2001. Vol. 287, no 04-mar, 278-282 p.
Keyword [en]
disordered systems, conductivity, simulation
Identifiers
URN: urn:nbn:se:kth:diva-20925ISI: 000170850200015OAI: oai:DiVA.org:kth-20925DiVA: diva2:339622
Note
QC 20100525Available from: 2010-08-10 Created: 2010-08-10 Last updated: 2017-12-12Bibliographically approved

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Rosengren, Anders

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