Issue
EPL
Volume 87, Number 1, July 2009
Article Number 17006
Number of page(s) 6
Section Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
DOI http://dx.doi.org/10.1209/0295-5075/87/17006
Published online 23 July 2009
EPL, 87 (2009) 17006
DOI: 10.1209/0295-5075/87/17006

Competing ground states of a Peierls-Hubbard nanotube

Jun Ohara and Shoji Yamamoto

Department of Physics, Hokkaido University - Sapporo 060-0810, Japan

yamamoto@mary.sci.hokudai.ac.jp

received 16 April 2009; accepted in final form 25 June 2009; published July 2009
published online 23 July 2009

Abstract
Motivated by iodo platinum complexes assembled within a quadratic-prism lattice, Pt(C2H8N2)(C10H8N2)I]4(NO3)8, we investigate the ground-state properties of a Peierls-Hubbard four-legged tube. Making a group-theoretical analysis, we systematically reveal a variety of valence arrangements, including half-metallic charge-density-wave states. Quantum and thermal phase competition is numerically demonstrated with particular emphasis on doping-induced successive insulator-to-metal transitions with conductivity increasing stepwise.

PACS
71.10.Hf - Non-Fermi-liquid ground states, electron phase diagrams and phase transitions in model systems.
71.45.Lr - Charge-density-wave systems.
02.20.-a - Group theory.

© EPLA 2009