量子自旋液体
凝聚态物理
物理
旋转冰
量子相
焦绿石
量子相变
量子
量子力学
相变
自旋极化
相(物质)
磁单极子
电子
作者
L. Savary,Xiaoqun Wang,Hae‐Young Kee,Yong Baek Kim,Yue Yu,Gang Chen
出处
期刊:Physical review
日期:2016-08-22
卷期号:94 (7)
被引量:41
标识
DOI:10.1103/physrevb.94.075146
摘要
The Coulombic quantum spin liquid in quantum spin ice is an exotic quantum phase of matter that emerges on the pyrochlore lattice and is currently actively searched for. Motivated by recent experiments on the Yb-based breathing pyrochlore material ${\mathrm{Ba}}_{3}{\mathrm{Yb}}_{2}{\mathrm{Zn}}_{5}{\mathrm{O}}_{11}$, we theoretically study the phase diagram and magnetic properties of the relevant spin model. The latter takes the form of a quantum spin ice Hamiltonian on a breathing pyrochlore lattice, and we analyze the stability of the quantum spin liquid phase in the absence of the inversion symmetry which the lattice breaks explicitly at lattice sites. Using a gauge mean-field approach, we show that the quantum spin liquid occupies a finite region in parameter space. Moreover, there exists a direct quantum phase transition between the quantum spin liquid phase and featureless paramagnets, even though none of theses phases break any symmetry. At nonzero temperature, we show that breathing pyrochlores provide a much broader finite-temperature spin liquid regime than their regular counterparts. We discuss the implications of the results for current experiments and make predictions for future experiments on breathing pyrochlores.
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