Weakly Interacting Disordered Electron Systems

ORAL

Abstract

We report on the interplay of interactions and disorder within the typical medium dynamical cluster approximation using the Anderson-Hubbard model. By the systematical incorporation of non-local spatial correlations and the diagonal disorder on an equal footing, we study the initial effects of electron interactions ($U$) in one (1D), two (2D), and three (3D) dimensions. Treating the interacting non-local cluster self-energy ($\Sigma^{(SOPT)}_c[{\cal\tilde{G}}](i,j\neq i)$) up to $\mathcal{O}\left[U^2\right]$ order in the perturbation expansion, we obtain the ground-state phase diagram in 3D for the disorder induced paramagnetic metal to insulator transition in the presence of weak interactions. We find that the critical disorder strength ($W_c$), required to localize all states, increases with increasing $U$; implying that the metallic phase is stabilized by interactions. In 2D, our results agree with previous findings on the destruction of the insulating phase by $U$, while in 1D, we find strong competition between both phases.

*This work is supported by the NSF EPSCoR EPS-1003897. Supercomputer support is provided by LONI and HPC@LSU.

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Authors

  • C.E. Ekuma

    • Department of Physics \& Astronomy and Center for Computation \& Technology, Louisiana State University, Baton Rouge, LA 70803, USA

  • Hanna Terletska

    • Louisiana State University
    • Ames Laboratory
    • Department of Physics \& Astronomy and Center for Computation \& Technology, Louisiana State University, Baton Rouge, LA 70803, USA
    • Louisiana State University. Ames lab.

  • Shuxiang Yang

    • Department of Physics \& Astronomy and Center for Computation \& Technology, Louisiana State University, Baton Rouge, LA 70803, USA
    • Louisiana State Univ - Baton Rouge
    • Louisiana State University

  • Ka-Ming Tam

    • Louisiana State University
    • Louisiana State Univ - Baton Rouge
    • Department of Physics \& Astronomy and Center for Computation \& Technology, Louisiana State University, Baton Rouge, LA 70803, USA
    • Lousiana State University
    • Department of Physics and Astronomy, Louisiana State University, Baton Rouge, LA 70803, USA

  • Vidhyadhiraja Narsimha Murthy Sudhindra

    • Theoretical Sciences Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore, 560064, India
    • Jawaharlal Nehru Centre for Advanced Scientific Research
    • Jawaharlal Nehru Ctr Adv Sci

  • Juana Moreno

    • Department of Physics \& Astronomy and Center for Computation \& Technology, Louisiana State University, Baton Rouge, LA 70803, USA
    • Louisiana State Univ - Baton Rouge

  • Mark Jarrell

    • Louisiana State University
    • Louisiana State Univ - Baton Rouge
    • Department of Physics \& Astronomy and Center for Computation \& Technology, Louisiana State University, Baton Rouge, LA 70803, USA
    • Department of Physics and Astronomy, Louisiana State University
    • Department of Physics and Astronomy, Louisiana State University, Baton Rouge, LA 70803, USA