Abstract
The one-dimensional half-filled correlated electron system with on-site (U), nearest-neighbor (V) and pair hopping (Y) repulsions is studied analytically at weak coupling, combined the Abelian bosonization with renormalization group methods. The corresponding ground-state phase diagram consists of three insulating phases, a charge-density-wave (CDW) phase for U − 2V 2Y, and a bond-charge-density-wave (BOW) phase for | U − 2V | < 2Y. The pair hopping, which breaks an accident symmetry and splits the frustrating line U − 2V = 0, provides a possibility for the dimerized BOW phase between the CDW and SDW phases. In the phenomenological parameter regime, the superconducting (SC) and bond-spin-density-wave (BSDW) phases are briefly discussed.
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