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arXiv 1001.2863cond-mat.str-el
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三角形海森堡反铁磁体在磁场中的变分研究

Variational Studies of Triangular Heisenberg Antiferromagnet in Magnetic Field

Tiamhock Tay, Olexei I. Motrunich

摘要:

本文研究了空间各向异性三角晶格上的海森堡反铁磁体在磁场中的变分问题。首先,我们在各向同性晶格上构造了一个简单而精确的1/3磁化平台波函数。从这个状态开始,我们得到自然的扩展到附近的相称的共面相位的高原两侧。后者也发生在低的晶格各向异性,而uud状态扩展到更大的各向异性。远离1/3平台和显着的各向异性,无公度状态有更好的能量,我们解决高场制度的共面和非共面状态之间的竞争。对于非常强的各向异性,我们的研究主要是准一维物理。变分的研究补充了精确的对角化计算,这为测试我们的试验波函数的能量,以及帮助确定候选相位提供了参考。

英文摘要:

We present a variational study of the Heisenberg antiferromagnet on the spatially anisotropic triangular lattice in magnetic field. First we construct a simple yet accurate wavefunction for the 1/3-magnetization plateau uud phase on the isotropic lattice. Beginning with this state, we obtain natural extensions to nearby commensurate coplanar phases on either side of the plateau. The latter occur also for low lattice anisotropy, while the uud state extends to much larger anisotropy. Far away from the 1/3 plateau and for significant anisotropy, incommensurate states have better energetics, and we address competition between coplanar and non-coplanar states in the high field regime. For very strong anisotropy, our study is dominated by quasi-1d physics. The variational study is supplemented by exact diagonalization calculations which provide a reference for testing the energetics of our trial wavefunctions as well as helping to identify candidate phases.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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