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Title: Metal-insulator transition in a weakly interacting disordered electron system
Authors: Ekuma, C. E.
Yang, S. -X.
Terletska, H.
Tam, K. -M.
Vidhyadhiraja, N. S.
Moreno, J.
Jarrell, M.
Keywords: Condensed Matter Physics
Quantum Impurity Models
Monte-Carlo Method
2 Dimensions
Anderson Localization
Fermion Systems
Issue Date: 2015
Publisher: American Physical Society
Citation: Physical Review B
Ekuma, C. E.; Yang, S. X.; Terletska, H.; Tam, K. M.; Vidhyadhiraja, N. S.; Moreno, J.; Jarrell, M., Metal-insulator transition in a weakly interacting disordered electron system. Physical Review B 2015, 92 (20), 5.
Abstract: The interplay of interactions and disorder is studied using the Anderson-Hubbard model within the typical medium dynamical cluster approximation. Treating the interacting, nonlocal cluster self-energy [Sigma(c)[(g) over tilde](i, j not equal i)] up to second order in the perturbation expansion of interactions, U-2, with a systematic incorporation of nonlocal spatial correlations and diagonal disorder, we explore the initial effects of electron interactions (U) in three dimensions. We find that the critical disorder strength (W-c(U)), required to localize all states, increases with increasing U; implying that the metallic phase is stabilized by interactions. Using our results, we predict a soft pseudogap at the intermediate W close to W-c(U) and demonstrate that the mobility edge (omega(epsilon)) is preserved as long as the chemical potential, mu, is at or beyond the mobility edge energy.
Description: Restricted access
ISSN: 1098-0121
Appears in Collections:Research Articles (Vidhyadhiraja N. S.)

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