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|Type:||Artigo de periódico|
|Title:||Non-gaussian Spatial Correlations Dramatically Weaken Localization|
|Author:||Javan Mard H.|
|Abstract:||We perform variational studies of the interaction-localization problem to describe the interaction-induced renormalizations of the effective (screened) random potential seen by quasiparticles. Here we present results of careful finite-size scaling studies for the conductance of disordered Hubbard chains at half-filling and zero temperature. While our results indicate that quasiparticle wave functions remain exponentially localized even in the presence of moderate to strong repulsive interactions, we show that interactions produce a strong decrease of the characteristic conductance scale g∗ signaling the crossover to strong localization. This effect, which cannot be captured by a simple renormalization of the disorder strength, instead reflects a peculiar non-Gaussian form of the spatial correlations of the screened disordered potential, a hitherto neglected mechanism to dramatically reduce the impact of Anderson localization (interference) effects.|
|Editor:||American Physical Society|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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