Abstract:

Prototypical models and their material incarnations are cornerstones to the understanding of quantum magnetism. Here we show theoretically that the recently synthesized magnetic compound Na2BaCo(PO4)2 (NBCP) is a rare, nearly ideal material realization of the S=1/2 triangular lattice antiferromagnet with significant easy-axis anisotropy. According to the established model, the NBCP hosts a spin supersolid state that breaks both the lattice translation and the spin rotational symmetries, a magnetic analogue of the long-sought supersolid quantum state. Near the quantum phase transition and also persistently in the supersolid phase, we observe prominent magnetic cooling effect till very low temperatures. The compound NBCP therefore represents an ideal platform to explore the physics of spin supersolidity and serves as a promising quantum magnet coolant.

Bio:

李偉，中科院理論物理研究所研究員，研究方向?yàn)閺?qiáng)關(guān)聯(lián)多體理論與計算、量子磁性與關(guān)聯(lián)電子系統(tǒng)前沿問題，在國際學(xué)術(shù)期刊發(fā)表論文近70篇，包括PRL/PRX/Nature Commun.12篇，獲國家基金委優(yōu)青資助，中科院-財政部基礎(chǔ)研究領(lǐng)域穩(wěn)定支持青年團(tuán)隊負(fù)責(zé)人。