Konik R M, Rice T M, Tsvelik A M
Department of Physics, Brookhaven National Laboratory, Upton, New York 11973-5000, USA.
Phys Rev Lett. 2006 Mar 3;96(8):086407. doi: 10.1103/PhysRevLett.96.086407.
We analyze a model of two-leg Hubbard ladders weakly coupled by interladder tunneling. At half filling a semimetallic state with small Fermi pockets is induced beyond a threshold tunneling strength. The sign changes in the single electron Green's function relevant for the Luttinger sum rule now take place at surfaces with both zeros and infinities with important consequences for the interpretation of angle-resolved photoemission spectroscopy experiments. Residual interactions between electron and holelike quasiparticles cause a transition to long range order at low temperatures. The theory can be extended to small doping leading to superconducting order.
我们分析了一种通过层间隧穿弱耦合的两腿哈伯德梯子模型。在半填充时，超过阈值隧穿强度会诱导出具有小费米面口袋的半金属态。现在，与卢廷格和规则相关的单电子格林函数中的符号变化发生在同时具有零点和无穷大的表面上，这对角度分辨光电子能谱实验的解释具有重要影响。电子和空穴状准粒子之间的残余相互作用导致在低温下向长程序的转变。该理论可以扩展到导致超导序的小掺杂情况。
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