arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1103.6002cond-mat.str-elcond-mat.quant-gascond-mat.stat-mech
收藏

kagome格点上玻色子的强耦合展开

Strong coupling expansion for bosons on the kagome lattice

Vipin Kerala Varma, Hartmut Monien

摘要:

利用级数展开法分析了kagome格子上玻色子从Mott绝缘相到超流相的相变性质,并计算了基态相图中的多临界点.可以看出,在对基态能量贡献非零权重的簇中,许多包含环。在Mott相内,还得到了基态关联的衰减指数。对于单粒子激发态,在第一布里渊区沿一定的对称切割计算准粒子色散和粒子和空穴的有效质量。此外,在八阶,相干长度临界指数被发现是接近的三维XY模型。

英文摘要:

We use series expansion techniques for analyzing properties of the phase transition between the Mott insulating and superfluid phase for bosons on the kagome lattice, and the multicritical point in the ground-state phase diagram for unit-filling is calculated. It is seen that of the clusters that contribute with non-zero weights to the ground state energy, many contain rings. The decay exponents of ground state correlations are also obtained within the Mott phase. For single-particle excited states, quasiparticle dispersion and effective masses for particles and holes are computed along certain symmetry cuts in the first Brillouin zone. Furthermore at eighth order, the coherence-length critical exponent is found to be comparably close to that of the 3D XY model.

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。

↑