量子有序-无序临界态及MnSi中的偏序秘密
Quantum order-by-disorder near criticality and the secret of partial order in MnSi
摘要：
量子相变附近已被证明是寻找新量子相的沃土。我们提出了一个物理动机和统一的描述金属量子临界点附近的相位重建量子有序无序的想法。费米表面的某些变形与竞争秩序的开始增强相空间可用于低能量，粒子-空穴波动和自洽降低自由能。应用量子有序无序的概念巡回helimagnet MnSi，我们表明，在量子临界点附近，波动导致螺旋有序波矢量的增加和重新取向远离晶格有利的方向。在这个波动驱动阶段的磁有序图案被发现是在很好的协议与中子散射数据在部分有序相的MnSi。
英文摘要：
The vicinity of quantum phase transitions has proven fertile ground in the search for new quantum phases. We propose a physically motivated and unifying description of phase reconstruction near metallic quantum-critical points using the idea of quantum order-by-disorder. Certain deformations of the Fermi surface associated with the onset of competing order enhance the phase space available for low-energy, particle-hole fluctuations and self-consistently lower the free energy. Applying the notion of quantum order-by-disorder to the itinerant helimagnet MnSi, we show that near to the quantum critical point, fluctuations lead to an increase of the spiral ordering wave vector and a reorientation away from the lattice favored directions. The magnetic ordering pattern in this fluctuation-driven phase is found to be in excellent agreement with the neutron scattering data in the partially ordered phase of MnSi.
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。
