Charge dynamics in doped Mott insulators
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Masanori Kohno; Xiao Hu; Masashi Tachiki
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Article
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2004
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Elsevier Science
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English
⚖ 413 KB
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