Insulating phases of electrons on a zigzag strip in the orbital magnetic field

Details Insulating phases of electrons on a zigzag strip in the orbital magnetic field Insulating phases of electrons on a zigzag strip in the orbital magnetic field

2010-07-24

arxiv.org/abs/1007.4251v2

Phys. Rev. B 82, 195119 (2010)

Physics

Condensed Matter

Strongly Correlated Electrons

7 pages, 4 figures, 2 tables

Scientific paper

10.1103/PhysRevB.82.195119

We consider electrons on a two-leg triangular ladder at half-filling and in an orbital magnetic field. In a two-band regime in the absence of the field, the electronic system remains conducting for weak interactions since there is no four-fermion Umklapp term. We find that in the presence of the orbital field there is a four-fermion Umklapp and it is always relevant for repulsive interactions. Thus in this special ladder, the combination of the orbital magnetic field and interactions provides a mechanism to drive metal-insulator transition already at weak coupling. We discuss properties of the possible resulting phases C0S2 and various C0S1 and C0S0.

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