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Phase diagram of the low-density two-dimensional homogeneous electron gas

By Neil Drummond and R. J. Needs

Abstract

We use quantum Monte Carlo methods to calculate the zero-temperature phase diagram of the two-dimensional homogeneous electron gas. We find a transition from a paramagnetic fluid to an antiferromagnetic triangular Wigner crystal at density parameter rs=31(1) a.u. and a transition to a ferromagnetic crystal at rs=38(5) a.u. The fully spin-polarized fluid is never stable. We search for, but do not find, the ferromagnetic “hybrid” phase proposed by H. Falakshahi and X. Waintal [ Phys. Rev. Lett. 94 046801 (2005)]

Topics: QC Physics
Year: 2009
DOI identifier: 10.1103/PhysRevLett.102.126402
OAI identifier: oai:eprints.lancs.ac.uk:55600
Provided by: Lancaster E-Prints

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