Two-dimensional charge order stabilized in clean polytype
2022年1月20日 · Here, we show the critical temperature for spatially-coherent, commensurate charge density waves (C-CDW) in 1T-TaS 2 can be raised to well above room temperature (~150 K above the expected...
Hidden CDW states and insulator-to-metal transition after a …
2018年7月20日 · Here, we investigate the microstructure of the H state in 1T-TaS 2−x Se x (x = 0, 0.5) in in situ low-temperature transmission electron microscopy (TEM). The formation of H state was found to involve multiple steps and was accompanied by an evident phase separation upon a single femtosecond laser pulse excitation.
低维材料中的电荷密度波 - 物理学报
电荷密度波(charge density wave, CDW)是低维体系中存在的一种重要的物理现象, 对CDW的研究有助于人们对低维系统中内禀电声子耦合和关联等相互作用有更深层次的认识, 同时通过对材料中CDW的精准调控可以有效控制低维材料中磁性、超导等物理性质.
Endotaxial stabilization of 2D charge density waves with long …
2024年2月15日 · Upon heating via in-situ TEM, the CDW continuously melts in a reversible hexatic process wherein topological defects form in the charge density wave. From these results, new regimes of the...
Transmission Electron Microscopy of CDW-Modulated …
The transmission electron microscope (TEM) has proved to be an extremely useful tool for investigating the periodic structural distortions associated with CDW in low-dimensional materials. With this instrument, numerous studies of the modulated phases and transitions between phases have been carried out on the family of two- and three ...
Nonequilibrium charge-density-wave order beyond the thermal limit - Nature
2021年5月3日 · Using time- and angle-resolved photoemission spectroscopy and time-resolved X-ray diffraction, we investigate the electronic and structural order parameters of an ultrafast photoinduced CDW-to ...
Ultrafast transmission electron microscopy using a laser-driven …
2017年5月1日 · We present the development of the first ultrafast transmission electron microscope (UTEM) driven by localized photoemission from a field emitter cathode. We describe the implementation of the instrument, the photoemitter concept and the quantitative electron beam parameters achieved.
金鉴李工：重大突破！超快TEM看见皮秒级相变过程！ - 知乎
2023年12月2日 · 哥廷根大学第四物理研究所Claus Ropers（通讯作者）等人在Science发表最新进展“Ultrafast nanoimaging of the order parameter in a structural phase transition”，在这项工作中，作者展示了电荷密度波(charge density wave, CDW)相的纳米空间和飞秒时间分辨率的实空间成 …
The transmission electron microscope (TEM) has proved to be an extremely useful tool for investigating the periodic structural distortions associated with CDW in low-dimensional materials. With this instrument, numerous studies of the modulated phases and transitions
Four-dimensional ultrafast transmission electron microscopy (4D-UTEM) measurements reveal a rich variety of structural dynamic phenomena at a phase transition in the charge-density-wave (CDW) 1T-TaSe2.