Exotic Gapless Mott Insulators of Bosons on Multi-Leg Ladders

Details Exotic Gapless Mott Insulators of Bosons on Multi-Leg Ladders Exotic Gapless Mott Insulators of Bosons on Multi-Leg Ladders

2010-08-24

arxiv.org/abs/1008.4105v3

Phys. Rev. Lett. 106, 046402 (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 4 figures; v3 is the print version; supplemental material attached

Scientific paper

10.1103/PhysRevLett.106.046402

We present evidence for an exotic gapless insulating phase of hard-core bosons on multi-leg ladders with a density commensurate with the number of legs. In particular, we study in detail a model of bosons moving with direct hopping and frustrating ring exchange on a 3-leg ladder at $\nu=1/3$ filling. For sufficiently large ring exchange, the system is insulating along the ladder but has two gapless modes and power law transverse density correlations at incommensurate wave vectors. We propose a determinantal wave function for this phase and find excellent comparison between variational Monte Carlo and density matrix renormalization group calculations on the model Hamiltonian, thus providing strong evidence for the existence of this exotic phase. Finally, we discuss extensions of our results to other $N$-leg systems and to $N$-layer two-dimensional structures.

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