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arXiv 1707.04039cond-mat.dis-nn
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Cayley树上的随机横场自旋玻璃模型:两个多体定域相之间的相变

Random Transverse Field Spin-Glass Model on the Cayley tree : phase transition between the two Many-Body-Localized Phases

Cecile Monthus

摘要:

利用实空间重正化方法研究了Cayley树上具有随机耦合和随机横场的量子Ising模型,构造了完整的本征态集。通过大偏差的重整化规则进行了分析。顺磁相和自旋玻璃多体定域相之间的相变涉及激活指数$ψ=1$和关联长度指数$ν=1$。发现含有$N_{SG}$自旋的自旋玻璃有序团簇相对于自旋总数$N$是极其稀疏的:其尺寸仅在临界点$N_{SG}^{criti} \propto \ln N$处几何地增长,并且在连续变化的指数$θ$保持在间隔$0<θ<1$的自旋玻璃相的有限区域中是次扩展的$N_{SG} \propto N^θ$。

英文摘要:

The quantum Ising model with random couplings and random transverse fields on the Cayley tree is studied by Real-Space-Renormalization in order to construct the whole set of eigenstates. The renormalization rules are analyzed via large deviations. The phase transition between the paramagnetic and the spin-glass Many-Body-Localized phases involves the activated exponent $ψ=1$ and the correlation length exponent $ν=1$. The spin-glass-ordered cluster containing $N_{SG}$ spins is found to be extremely sparse with respect to the total number $N$ of spins : its size grows only logarithmically at the critical point $N_{SG}^{criti} \propto \ln N$, and it is sub-extensive $N_{SG} \propto N^θ$ in the finite region of the spin-glass phase where the continuously varying exponent $θ$ remains in the interval $0<θ<1$.

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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