量子临界固体
Quantum Critical Solids
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中文总结 AI 辅助
本研究探讨横声子速度消失的量子固体,揭示其三次弹性非线性在d<4时驱动系统至强耦合Lifshitz量子临界点,相变通常一级,并在d=2时变为四次边缘相互作用,产生对数奇异性,为量子材料中的实现提供可能。
中文摘要 AI 辅助
我们研究了横声子速度消失的量子固体的命运。这种“柔性”固体表现出三次弹性非线性,该非线性在空间维度$d<4$中是相关的,并在$d=3$中驱动系统到一个强耦合的Lifshitz量子临界点,我们通过$\u03b5 = 4-d$展开对其进行分析。相关的相变通常是一级的,从而抢先阻止了系统完全接近强耦合不动点。然而,这个量子临界点的临界数据在转变附近的Ginzburg区域内是可获取的。这种三次非线性在$d=2$中精确消失,在那里主导相互作用反而是四次且是边缘的,导致弱的对数奇异性。我们讨论了这种“晶体Lifshitz临界性”在量子材料中的可能实现。
英文摘要
We study the fate of quantum solids with a vanishing velocity of transverse phonons. Such ``floppy'' solids exhibit a cubic elastic nonlinearity that is relevant in spatial dimensions $d<4$ and drives the system to a strongly-coupled Lifshitz quantum critical point in $d=3$, that we analyze in an $ε= 4-d$ expansion. The associated phase transition is generically first-order, preempting the system's full access to the strongly-coupled fixed point. Nevertheless, the critical data of this quantum critical point is accessible within a Ginzburg region in the vicinity of the transition. This cubic nonlinearity vanishes exactly in $d=2$, where the leading interactions are instead quartic and are marginal, leading to weak logarithmic singularities. We discuss possible realizations of this ``crystal Lifshitz criticality'' in quantum materials.
发表机构
- The Abdus Salam ICTP(阿卜杜斯·萨拉姆国际理论物理中心)
- University of Colorado, Boulder(科罗拉多大学博尔德分校)
- University of Chicago(芝加哥大学)
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