2006/12/06 by A. Kashuba, Kashuba, A.
Physics and Astronomy · #FOS: Physical sciences #Materials Science (cond-mat.mtrl-sci) #cond-mat.mtrl-sci
paper · pdf · doi:10.48550/arxiv.cond-mat/0612154
4 pages, 2 figures
arxiv created 2006/12/06 · arxiv updated 2009/12/01
A new bosonic, excitonic method for interacting electrons is developed. For two-dimensional electron liquid, it reveals a noncompensated quantum crystal phase ranging from the high density, or vanishing Coulomb interaction, limit: rs=0, to a lower density rs∼ 10, where a condensation of exciton pairs and the loss of the Fermi step is possible. The correlation energy and the static susceptibility, calculated using the method, are in agreement with the independent studies. A proof of the instability of the Fermi surface in the limit rs→ 0 is given. The concept of quantum crystal is capable to explain the metal-insulator transition in Si field-effect heterostructures.