Family of exactly solvable models with an ultimative quantum paramagnetic ground state

Details Family of exactly solvable models with an ultimative quantum paramagnetic ground state Family of exactly solvable models with an ultimative quantum paramagnetic ground state

2009-12-10

arxiv.org/abs/0912.1959v3

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

We present a family of two-dimensional frustrated quantum magnets solely based on pure nearest-neighbor Heisenberg interactions which can be solved quasi-exactly. All lattices are constructed in terms of frustrated quantum cages containing a chiral degree of freedom protected by frustration. The ground states of these models are dubbed ultimate quantum paramagnets and exhibit an extensive entropy at zero temperature. We discuss the unusual and extensively degenerate excitations in such phases. Implications for thermodynamic properties as well as for decoherence free quantum computation are discussed.

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