处于2/3填充状态的三聚化 kagomé晶格中的原子费米气体。

Atomic Fermi gas in the trimerized kagomé lattice at 2/3 filling.

作者信息

Damski B, Everts H-U, Honecker A, Fehrmann H, Santos L, Lewenstein M

机构信息

Institut für Theoretische Physik, Universität Hannover, Appelstrasse 2, D-30167 Hannover, Germany.

出版信息

Phys Rev Lett. 2005 Aug 5;95(6):060403. doi: 10.1103/PhysRevLett.95.060403.

DOI:10.1103/PhysRevLett.95.060403

PMID:16090930

Abstract

We study low temperature properties of a spinless interacting Fermi gas in the trimerized kagomé lattice. The case of two fermions per trimer is described by a quantum spin 1/2 model on the triangular lattice with couplings depending on the bond directions. Using exact diagonalizations we show that the system exhibits nonstandard properties of a quantum spin-liquid crystal, combining a planar antiferromagnetic order with an exceptionally large number of low-energy excitations.

摘要

我们研究了三聚化的 Kagomé 晶格中无自旋相互作用费米气体的低温特性。每个三聚体中有两个费米子的情况由三角形晶格上的量子自旋 1/2 模型描述，其耦合取决于键的方向。通过精确对角化，我们表明该系统展现出量子自旋液晶的非标准特性，将平面反铁磁序与异常大量的低能激发相结合。