高磁场下量子自旋材料中无序诱导的玻色-爱因斯坦凝聚体的探测
Detection of a Disorder-Induced Bose-Einstein Condensate in a Quantum Spin Material at High Magnetic Fields
摘要：
掺杂Br杂质的耦合自旋1链材料NiCl $_2$ -4SC（NH $_2$）$_2$（DTN）有望成为在高磁场下观察多体局域化的理想候选材料：所谓的“玻色玻璃”，一种零温玻色流体，可压缩，无间隙，非相干，短程关联.使用核磁共振（NMR），我们批判性地解决了掺杂DTN中玻色玻璃的稳定性，并发现它拥有一种新的无序诱导的有序状态的物质，多体物理导致意外复苏的量子相干性出现在本地化的杂质状态。实验相图的这种新的“有序从无序”相，建立从NMR $T_1^{-1}$弛豫速率数据在（13 $\pm$ 1）% Br掺杂DTN，被发现是在良好的协议与理论预测从大规模量子蒙特卡罗模拟。
英文摘要：
The coupled spin-1 chains material NiCl$_2$-4SC(NH$_2$)$_2$ (DTN) doped with Br impurities is expected to be a perfect candidate for observing many-body localization at high magnetic field: the so-called "Bose glass", a zero-temperature bosonic fluid, compressible, gapless, incoherent, and short-range correlated. Using nuclear magnetic resonance (NMR), we critically address the stability of the Bose glass in doped DTN, and find that it hosts a novel disorder-induced ordered state of matter, where many-body physics leads to an unexpected resurgence of quantum coherence emerging from localized impurity states. An experimental phase diagram of this new "order-from-disorder" phase, established from NMR $T_1^{-1}$ relaxation rate data in the (13 $\pm$ 1)% Br-doped DTN, is found to be in excellent agreement with the theoretical prediction from large-scale quantum Monte Carlo simulations.
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