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arxiv: 0912.4008 · v1 · pith:N6XWSFH2new · submitted 2009-12-20 · ❄️ cond-mat.str-el

Unconventional state with two coexisting long-range orders for frustrated Heisenberg model at quantum phase transition

classification ❄️ cond-mat.str-el
keywords coexistingfrustratedheisenberglong-rangemodelordersphasequantum
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For the frustrated two-dimensional $S=1/2$ antiferromagnetic Heisenberg model close to quantum phase transition we consider the singlet ground states retaining both translational and SU(2) symmetry. Besides usually discussed checkerboard, spin-liquid and stripe states an unconventional state with two coexisting long-range orders appears to be possible at sufficiently large damping of spin excitations. The problem is treated in the frames of self-consistent spherically symmetric approach.

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