Low-frequency current fluctuations in doped ladders
Low-frequency current fluctuations in doped ladders
复制标题
掺杂梯中的低频电流波动
DOI：
10.1103/physrevb.65.020406
复制
发表时间：
2001
影响因子：
3.7
通讯作者：
S. Capponi
中科院分区：
文献类型：
--
作者：
K. Tsutsui;D. Poilblanc;S. Capponi
电荷电流的静态和动态的相关性计算通过精确的对角化方法上的2腿t-t '-J梯子，表现出一个急剧的过渡之间的路德-金刚砂（LE）相的空穴对和一个相位与decenfined孔。在LE阶段，我们发现短程低能量的不相称的电流波动，这是内在连接到一个空穴对内的内部电荷动态。相反，当空穴未绑定，电流磁化率的最大值突然移动到相称的波矢量$\pi$和强烈增加，减少掺杂，这表明在足够小的掺杂对交错磁通状态的不稳定性。
Charge current static and dynamical correlations are computed by exact diagonalisation methods on a 2-leg t-t'-J ladder which exhibits a sharp transition between a Luther-Emery (LE) phase of hole pairs and a phase with deconfined holes. In the LE phase, we find short-range low-energy incommensurate current fluctuations which are intrinsically connected to the internal charge dynamics within one hole pair. On the contrary, when holes unbind, the maximum of the current susceptibility moves abruptly to the commensurate wavevector $\pi$ and strongly increases for decreasing doping suggesting an instability towards a staggered flux state at sufficiently small doping.