论文标题
连续从兰道准粒子过渡到中性旋子
Continuous transition from a Landau quasiparticle to a neutral spinon
论文作者
论文摘要
我们检查了波功能的ANSATZ，其中掺杂孔可以经历从电荷$+e $ landau quasiparticle到中性旋子的量子过渡，这是基础自旋旋转相关性的函数。如图所示，这样的波函数准确地捕获了所有基本特征，这些特征是在两腿$ t $ -j $ j $阶梯中以精确的对角线化和密度矩阵重质化组模拟揭示的。因此，其分析形式可以明确理解非常规基础状态的机制。相图中的过渡伴随着孔复合材料从紧密的电荷旋转结合到松散结合的孔旋转对的变化。在后者中，孔带有\ emph {有限}自旋电流，但在退化地面状态下具有消失的电荷电流。我们表明，由于内部相对旋转运动的运动，此处的孔复合材料的电荷会动态减小，这从根本上与一维情况下的简单电荷旋转分离不同。我们进一步表明，同样的效果也导致了这种非landau准粒子制度中的两个掺杂孔之间的强大配对。
We examine a wavefunction ansatz in which a doped hole can experience a quantum transition from a charge $+e$ Landau quasiparticle to a neutral spinon as a function of the underlying spin-spin correlation. As shown variationally, such a wavefunction accurately captures all the essential features revealed by exact diagonalization and density matrix renormalization group simulations in a two-leg $t$-$J$ ladder. Hence its analytic form can provide an explicit understanding of the mechanism for the unconventional ground state. The transition in the phase diagram is accompanied by a change of the hole composite from a tight charge-spin binding to a loosely-bound hole-spin pair. In the latter, the hole carries a \emph{finite} spin current but with vanishing charge current in the degenerate ground states. We show that the charge of the hole composite here is dynamically diminished due to an internal relative hole-spin motion, which is fundamentally distinct from a simple charge-spin separation in a one-dimensional case. We further show that the same effect is also responsible for a strong pairing between two doped holes in such a non-Landau quasiparticle regime.
