论文标题
电子液体的量子paracrystalline剪切模式
Quantum Paracrystalline Shear Modes of the Electron Liquid
论文作者
论文摘要
与经典的流体不同，量子费米液体可以在任意小波矢量和频率上支持长寿且传播的剪切声波，尽管缺乏任何形式的远距离晶体顺序，但仍让人联想到晶体中的横向声音。预计这种模式将存在于中等相互作用的金属中，在中等相互作用的金属中，将准颗粒质量重新归一化的是二维（2D）的裸质量的两倍以上，但是它仍然未被发现，因为它很难激发，因为它不涉及电荷密度波动，相反，与传统的血浆模式相反。在这项工作中，我们提出了一种在干净的金属通道中激发和检测这种非常规模式的策略。我们表明，剪切声是导致在狭窄通道的交流电导率中出现尖锐倾角的谐振频率，以符合其分散体。液体在以类似方式与滑动晶体的方式最小化其耗散的同时共鸣。可以调整为Wigner结晶过渡的Ultra-CLEAN 2D材料，例如硅金属 - 氧化物 - 氧化型野外晶体管，MGZNO/ZnO，P-GAAS和Alas量子孔都是有希望的平台，可以实验地发现剪切声。
Unlike classical fluids, a quantum Fermi liquid can support a long-lived and propagating shear sound wave at arbitrarily small wave vectors and frequencies, reminiscent of the transverse sound in crystals, despite lacking any form of long-range crystalline order. This mode is expected to be present in moderately interacting metals where the quasiparticle mass is renormalized to be more than twice the bare mass in two dimensions (2D), but it has remained undetected because it is hard to excite since it does not involve charge density fluctuations, in contrast to the conventional plasma mode. In this work we propose a strategy to excite and detect this unconventional mode in clean metallic channels. We show that the shear sound is responsible for the appearance of sharp dips in the ac conductance of narrow channels at resonant frequencies matching its dispersion. The liquid resonates while minimizing its dissipation in an analogous fashion to a sliding crystal. Ultra-clean 2D materials that can be tuned towards the Wigner crystallization transition such as silicon metal-oxide-semiconductor field-effect transistors, MgZnO/ZnO, p-GaAs, and AlAs quantum wells are promising platforms to experimentally discover the shear sound.
