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Charge Friedel oscillations in a Mott insulator

✍ Scribed by Mross, David F.; Senthil, T.

Book ID
119995402
Publisher
The American Physical Society
Year
2011
Tongue
English
Weight
190 KB
Volume
84
Category
Article
ISSN
1098-0121

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Charge dynamics in the two-dimensional Hubbard model is investigated by quantum Monte Carlo simulations. We find that dielectric function ðq; xÞ becomes negative at finite frequencies for U =t ¼ 4 with hole density d ¼ 0:15. Numerical results indicate that vertex corrections enhance charge fluctuati