0 10 22 22 13 F eb 2 00 1 Quantum Phases of the Shastry-Sutherland Antiferromagnet
0 10 22 22 13 F eb 2 00 1 Quantum Phases of the Shastry-Sutherland Antiferromagnet
复制标题
0 10 22 22 13 Feb 2 00 1 Shastry-Sutherland 反铁磁体的量子相
DOI：
--
复制
发表时间：
--
期刊：
影响因子：
--
通讯作者：
S. Sachdev
中科院分区：
文献类型：
--
作者：
C. Chung;J. Marston;S. Sachdev
Much interest has recently focused on the magnetic properties of the insulator SrCu2(BO3)2. The low energy spin excitations in this material reside on the S = 1/2 Cu ions which lie in two-dimensional layers decoupled from each other. The experiments show a clear indication of an energy gap towards spin excitations, making this one of the few known two-dimensional systems with a spin gap. Remarkably, the pattern of near-neighbor antiferromagnetic exchange couplings between the Cu ions turns out to be identical to that in a model Hamiltonian studied many years ago by Shastry and Sutherland. These authors also showed that a simple decoupled dimer wavefunction was an exact eigenstate of this Hamiltonian, and that it was the ground state over a restricted parameter regime. The Shastry-Sutherland antiferromagnet is sketched in Fig 1. The Hamiltonian is
