论文标题
bani $ _2 $ as $ _2 $的电子列液体液体
An Electronic Nematic Liquid in BaNi$_2$As$_2$
论文作者
论文摘要
了解相互作用电子的组织原理和新型电子相的出现是凝结物理物理学的中心努力。电子诺动态性，其中电子流体中的离散旋转对称性在不受影响的情况下被打破，而不受影响，这是这种阶段的重要例子。它已被证明在相关的电子系统中无处不在，并且重要的是了解基于Fe的超导体。在这里，我们发现这种破裂的对称性的波动在\ bnap（\ bnap）的相变高的温度范围内（与基于Fe的系统的镍同源物）相当强。这提供了一种电子词性，本质上是动态性的，它表现出对基础晶格的前所未有的耦合。退化的列构构之间的波动会导致声子分裂，而不会提升变性或破坏对称性，类似于磁系统中的旋转液体。
Understanding the organizing principles of interacting electrons and the emergence of novel electronic phases is a central endeavor of condensed matter physics. Electronic nematicity, in which the discrete rotational symmetry in the electron fluid is broken while the translational one remains unaffected, is a prominent example of such a phase. It has proven ubiquitous in correlated electron systems, and is of prime importance to understand Fe-based superconductors. Here, we find that fluctuations of such broken symmetry are exceptionally strong over an extended temperature range above phase transitions in \bnap, the nickel homologue to the Fe-based systems. This provides evidence for a type of electronic nematicity, dynamical in nature, which exhibits an unprecedented coupling to the underlying crystal lattice. Fluctuations between degenerate nematic configurations cause a splitting of phonon lines, without lifting degeneracies nor breaking symmetries, akin to spin liquids in magnetic systems.
