Doublonlike Excitations and Their Phononic Coupling in a Mott Charge-Density-Wave System
Doublonlike Excitations and Their Phononic Coupling in a Mott Charge-Density-Wave System
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DOI：
10.1103/physrevx.11.011059
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发表时间：
2021-03-24
影响因子：
12.5
通讯作者：
Iwasa, Y.
中科院分区：
文献类型：
--
作者：
Butler, C. J.;Yoshida, M.;Iwasa, Y.
在某些情况下，电子-声子驱动的电荷密度波可以使电子相关性成为主导，从而将系统驱动到莫特绝缘状态。对莫特态和先前的电荷密度波的新认识可能来自于对它们潜在自由度的耦合动力学的观察。在这里，单电子隧穿注入到莫特电荷密度波材料1 T-TaS 2的上哈伯德带揭示了非常窄的电子激发，其耦合到与电荷密度波的周期性晶格畸变相关的振幅模式声子。这给出了一个生动的微观视图之间的相互作用的激发莫特状态和晶格动力学的电荷密度波的先驱。
Electron-phonon-driven charge-density waves can in some circumstances allow electronic correlations to become predominant, driving a system into a Mott insulating state. New insight into both the Mott state and preceding charge-density wave may result from observations of the coupled dynamics of their underlying degrees of freedom. Here, tunneling injection of single electrons into the upper Hubbard band of the Mott charge-density-wave material 1T-TaS2 reveals extraordinarily narrow electronic excitations which couple to amplitude mode phonons associated with the charge-density wave's periodic lattice distortion. This gives a vivid microscopic view of the interplay between excitations of the Mott state and the lattice dynamics of its charge-density wave precursor.