用各向同性Hydrostatic Pressure重对称破缺对称
Re-Symmetrizing the Broken Symmetry with Isotropic Hydrostatic Pressure
摘要：
凝聚态物理的最新进展，如石墨烯、拓扑绝缘体和Weyl半金属，往往源于其晶格结构的特定拓扑对称性。具有不同自由度的量子态，例如自旋、谷、层等，从这些对称性中产生，并且这些状态的相干叠加形成多个能量子带。赝自旋是一个类似于狄拉克旋量矩阵的概念，是对这种多子带系统的成功描述。当电子-电子相互作用占主导地位时，多体量子相出现。它们通常具有数字化的赝自旋极化，并在某些普适临界赝自旋能裂处表现出尖锐的相变。在这篇手稿中，我们提出了我们的显着发现，流体静压诱导简并之间的两个最低的朗道水平。在朗道能级填充因子$ν$ = 3/2附近的脆弱关联量子液相的赝自旋极化跃迁证明了这种简并性。受益于恒定的空穴浓度和敏感的性质，这些转变，我们可以研究的微调效果的静水压力的顺序为10 $μ$ eV的，远远超出了meV级的最先进的其他技术的分辨率。
英文摘要：
Recent progresses in condensed matter physics, such as graphene, topological insulator and Weyl semimetal, often origin from the specific topological symmetries of their lattice structures. Quantum states with different degrees of freedom, e.g. spin, valley, layer, etc., arise from these symmetries, and the coherent superpositions of these states form multiple energy subbands. The pseudospin, a concept analogy to the Dirac spinor matrices, is a successful description of such multi-subband systems. When the electron-electron interaction dominates, many-body quantum phases arise. They usually have digitized pseudospin polarizations and exhibit sharp phase transitions at certain universal critical pseudospin energy splittings. In this manuscript, we present our remarkable discovery of hydrostatic pressure induced degeneracy between the two lowest Landau levels. This degeneracy is evidenced by the pseudospin polarization transitions of the fragile correlated quantum liquid phases near Landau level filling factor $ν$ = 3/2. Benefitted from the constant hole concentration and the sensitive nature of these transitions, we can study the fine-tuning effect of the hydrostatic pressure of the order of 10 $μ$eV, well beyond the meV-level state-of-the-art resolution of other techniques.
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