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5 papers · 2 filters
Anomalous Spin Dynamics of Hubbard Model on Honeycomb Lattices
Gao-Yong Sun, Su-Peng Kou
In this paper, the honeycomb Hubbard model in optical lattices is investigated using O(3) non-linear sigma model. A possible quantum non-magnetic insulator in a narrow parameter re…
Translation-symmetry protected topological orders on lattice
Su-Peng Kou, Xiao-Gang Wen
In this paper we systematically study a simple class of translation-symmetry protected topological orders in quantum spin systems using slave-particle approach. The spin systems on…
Macroscopic Quantum Tunneling Effect of Z2 Topological Order
Jing Yu, Su-Peng Kou
In this paper, macroscopic quantum tunneling (MQT) effect of Z2 topological order in the Wen-Plaquette model is studied. This kind of MQT is characterized by quantum tunneling proc…
Cold-atoms on a two-dimensional square optical lattice with an alternating potential
Huaiming Guo, Yuchuan Wen, Shiping Feng
The cold-atom on a two-dimensional square optical lattice is studied within the hard-core boson Hubbard model with an alternating potential. In terms of the quantum Monte Carlo met…
Stripe segregation and magnetic coupling in the nickelate La_5/3 Sr_1/3 NiO_4
Udo Schwingenschloegl, Cosima Schuster, Raymond Fresard
We investigate the consequences of the stripe formation in the nickelate La5/3Sr1/3NiO4 for the details of its crystal structure and electronic states. Our data are based on numeri…