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

Drummond, Neil and Needs, R. J. (2009) Phase diagram of the low-density two-dimensional homogeneous electron gas. Physical review letters, 102 (12): 126402. ISSN 1079-7114

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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)].