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Electron correlations in the Hubbard model on the planar pyrochlore lattice

✍ Scribed by Akihisa Koga; Takuya Yoshioka; Norio Kawakami; Hisatoshi Yokoyama

Publisher
Elsevier Science
Year
2007
Tongue
English
Weight
213 KB
Volume
460-462
Category
Article
ISSN
0921-4534

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✦ Synopsis

We investigate the two-dimensional Hubbard model on the planar pyrochlore lattice at half filling. By means of variational Monte Carlo simulations including nearest neighbor doublon-holon correlations as well as onsite correlations, we discuss how the semi-metallic state is stabilized at zero temperature. The possibility of the plaquette ordered state is also addressed in the framework of our treatment.

πŸ“œ SIMILAR VOLUMES

Magnetic transition in the Hubbard model
Magnetic transition in the Hubbard model on the triangular lattice
✍ Takuya Yoshioka; Akihisa Koga; Norio Kawakami πŸ“‚ Article πŸ“… 2010 πŸ› Elsevier Science 🌐 English βš– 243 KB

We investigate a magnetic transition in the half-filled Hubbard model on the triangular lattice. By making use of the path-integral renormalization group (PIRG) method with a spin-rotated frame, we calculate the ground state energy and charge/spin correlation functions for a cluster with 36 sites. W