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Possible charge instabilities in two-dimensional doped Mott insulators

✍ Scribed by Bejas, Matías; Greco, Andrés; Yamase, Hiroyuki


Book ID
124077206
Publisher
The American Physical Society
Year
2012
Tongue
English
Weight
466 KB
Volume
86
Category
Article
ISSN
1098-0121

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Charge dynamics in doped Mott insulators
✍ Masanori Kohno; Xiao Hu; Masashi Tachiki 📂 Article 📅 2004 🏛 Elsevier Science 🌐 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