Xu Xiao Yan, Law K T, Lee Patrick A
Department of Physics, Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, China.
Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
Phys Rev Lett. 2019 Apr 26;122(16):167001. doi: 10.1103/PhysRevLett.122.167001.
In our previous work [Phys. Rev. Lett. 121, 046401 (2018)PRLTAO0031-900710.1103/PhysRevLett.121.046401], we found a quantum spin liquid phase with a spinon Fermi surface in the two dimensional spin-1/2 Heisenberg model with four-spin ring exchange on a triangular lattice. In this work we dope the spinon Fermi surface phase by studying the t-J model with four-spin ring exchange. We perform density matrix renormalization group calculations on four-leg cylinders of a triangular lattice and find that the dominant pair correlation function is that of a pair density wave; i.e., it is oscillatory while decaying with distance with a power law. The doping dependence of the period is studied. This is the first example where a pair density wave is the dominant pairing in a generic strongly interacting system where the pair density wave cannot be explained as a composite order and no special symmetry is required.
在我们之前的工作[《物理评论快报》121, 046401 (2018)PRLTAO0031 - 900710.1103/PhysRevLett.121.046401]中，我们在具有四自旋环交换的二维自旋 - 1/2海森堡模型的三角晶格中发现了一个具有自旋子费米面的量子自旋液体相。在这项工作中，我们通过研究具有四自旋环交换的t - J模型来对自旋子费米面相进行掺杂。我们在三角晶格的四腿圆柱上进行密度矩阵重整化群计算，并发现主导的对关联函数是对密度波的关联函数；也就是说，它是振荡的，同时随距离以幂律衰减。研究了周期的掺杂依赖性。这是第一个例子，其中对密度波是一般强相互作用系统中的主导配对，在该系统中，对密度波不能被解释为复合序，并且不需要特殊对称性。
