Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2006-11-15
Phys. Rev. B. 75, 094406 (2007)
Physics
Condensed Matter
Strongly Correlated Electrons
21 pages, 27 figures
Scientific paper
10.1103/PhysRevB.75.094406
We construct a two-dimensional microscopic model of interacting quantum dimers that displays an infinite number of periodic striped phases in its T=0 phase diagram. The phases form an incomplete devil's staircase and the period becomes arbitrarily large as the staircase is traversed. The Hamiltonian has purely short-range interactions, does not break any symmetries of the underlying square lattice, and is generic in that it does not involve the fine-tuning of a large number of parameters. Our model, a quantum mechanical analog of the Pokrovsky-Talapov model of fluctuating domain walls in two dimensional classical statistical mechanics, provides a mechanism by which striped phases with periods large compared to the lattice spacing can, in principle, form in frustrated quantum magnetic systems with only short-ranged interactions and no explicitly broken symmetries.
Fradkin Eduardo
Papanikolaou Stefanos
Raman Sundara K.
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