d-Mott phases in one and two dimensions -: art. no. 037006

被引:36
作者
Läuchli, A [1 ]
Honerkamp, C
Rice, TM
机构
[1] Univ Toulouse 3, CNRS, UMR 5152, Phys Theor Lab, F-31062 Toulouse, France
[2] ETH Honggerberg, CH-8093 Zurich, Switzerland
[3] MIT, Dept Phys, Cambridge, MA 02139 USA
关键词
D O I
10.1103/PhysRevLett.92.037006
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We use exact diagonalization to determine the spectrum of reduced Hamiltonians based on renormalization group flows to strong coupling. For the half-filled two-leg Hubbard ladder we reproduce the known insulating d-Mott ground state with spin and charge gaps. For the saddle point regions of the two-dimensional Hubbard model near half filling we find a crossover to a similar strong coupling state, which truncates the Fermi surface near the saddle points. At lower scales d-wave superconductivity appears on the remaining Fermi surface.
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页数:4
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