Institut für Theoretische Physik, Leibniz Universität Hannover, Appelstrasse 2, DE-30167 Hannover, Germany.
Singapore University of Technology and Design, 20 Dover Drive, 138682 Singapore, Singapore and Merlion MajuLab, CNRS-UNS-NUS-NTU International Joint Research Unit, UMI 3654 Singapore, Singapore.
Phys Rev Lett. 2014 Oct 31;113(18):183002. doi: 10.1103/PhysRevLett.113.183002.
Recent experiments show that periodic modulations of cold atoms in optical lattices may be used to engineer and explore interesting models. We show that double modulation combining lattice shaking and modulated interactions allows for the engineering of a much broader class of lattice with correlated hopping, which we study for the particular case of one-dimensional systems. We show, in particular, that by using this double modulation it is possible to study Hubbard models with asymmetric hopping, which, contrary to the standard Hubbard model, present insulating phases with both parity and string order. Moreover, double modulation allows for the simulation of lattice models in unconventional parameter regimes, as we illustrate for the case of the spin-1/2 Fermi-Hubbard model with correlated hopping, a relevant model for cuprate superconductors.
最近的实验表明，通过周期性调制光学晶格中的冷原子，可以用来设计和探索有趣的模型。我们证明，晶格振动和调制相互作用的双重调制可以实现具有相关跳跃的更广泛的晶格工程，我们针对一维系统的特殊情况进行了研究。我们特别表明，通过使用这种双重调制，可以研究具有非对称跳跃的 Hubbard 模型，与标准 Hubbard 模型相反，这些模型具有奇偶和字符串顺序的绝缘相。此外，双重调制可以模拟非常规参数区域的晶格模型，我们以具有相关跳跃的自旋 1/2 Fermi-Hubbard 模型为例说明了这一点，该模型是铜氧化物超导体的一个相关模型。
