@article{ISI:000327237700010,
 abstract = {We study a system of hard-core bosons at half-filling in a
one-dimensional optical superlattice. The bosons are allowed to hop to
nearest-and next-nearest-neighbor sites. We obtain the ground-state
phase diagram as a function of microscopic parameters using the
finite-size density-matrix renormalization-group method. Depending on
the sign of the next-nearest-neighbor hopping and the strength of the
superlattice potential the system exhibits three different phases,
namely the bond-order (BO) solid, the superlattice induced Mott
insulator (SLMI), and the superfluid (SF) phase. When the signs of both
hopping amplitudes are the same (the unfrustratedase), the system
undergoes a transition from the SF to the SLMI at a nonzero value of the
superlattice potential. On the other hand, when the two amplitudes
differ in sign (the frustrated case), the SF is unstable to switching on
a superlattice potential and also exists only up to a finite value of
the next-nearest-neighbor hopping. This part of the phase diagram is
dominated by the BO phase which breaks translation symmetry
spontaneously even in the absence of the superlattice potential and can
thus be characterized by a bond-order parameter. The transition from BO
to SLMI appears to be first order.},
 article-number = {053625},
 author = {Dhar, Arya and Mishra, Tapan and Pai, Ramesh V. and Mukerjee, Subroto
and Das, B. P.},
 doi = {10.1103/PhysRevA.88.053625},
 eissn = {1094-1622},
 issn = {1050-2947},
 journal = {PHYSICAL REVIEW A},
 month = {NOV 21},
 number = {5},
 times-cited = {12},
 title = {Hard-core bosons in a zig-zag optical superlattice},
 unique-id = {ISI:000327237700010},
 volume = {88},
 year = {2013}
}