Interaction-driven polarization shift in the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>t</mml:mi><mml:mtext>−</mml:mtext><mml:mi>V</mml:mi><mml:mtext>−</mml:mtext><mml:msup><mml:mi>V</mml:mi><mml:mo>′</mml:mo></mml:msup></mml:mrow></mml:math> lattice fermion model at half filling: Emergent Haldane phase

Abstract

The author studies a topological phase transition in the t-V-V' model of interacting spinless lattice fermions. The paper shows that the small V' gapped charge-density wave phase is topologically distinct from the large V' gapped bond-order and charge-density wave phases; this manifests in different values of the many-body polarization. The two topologically distinct regions are separated by a gapless Luttinger liquid phase, rather than a single gap closure point.

Topics & Concepts