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Current-Driven to Thermally Driven Multistep Phase Transition of Charge Density Wave Order in 1T-TaS.
Nano Lett
December 2024
State Key Laboratory of Photovoltaic Science and Technology, Shanghai Frontiers Science Research Base of Intelligent Optoelectronic and Perception, Institute of Optoelectronic and Department of Material Science, Fudan University, Shanghai 200433, China.
Two-dimensional 1T-TaS is renowned for its exotic physical properties including superconductivity, Mott physics, flat-band electronics, and charge density wave (CDW) orders. In particular, the CDW phase transitions (PTs) in 1T-TaS attracted extensive research interest, showing prominent potential in electronic devices. However, mechanisms underlying electrically driven PTs remain elusive.
View Article and Find Full Text PDFRoom-temperature non-volatile optical manipulation of polar order in a charge density wave.
Nat Commun
October 2024
International Center for Quantum Materials, School of Physics, Peking University, Beijing, 100871, China.
Utilizing ultrafast light-matter interaction to manipulate electronic states of quantum materials is an emerging area of research in condensed matter physics. It has significant implications for the development of future ultrafast electronic devices. However, the ability to induce long-lasting metastable electronic states in a fully reversible manner is a long-standing challenge.
View Article and Find Full Text PDFUltrafast generation of hidden phases via energy-tuned electronic photoexcitation in magnetite.
Proc Natl Acad Sci U S A
June 2024
School of Basic Sciences, Institute of Physics, Laboratory for Ultrafast Microscopy and Electron Scattering, École Polytechnique Fédérale de Lausanne, Lausanne CH-1015, Switzerland.
Phase transitions occurring in nonequilibrium conditions can evolve through high-energy intermediate states inaccessible via equilibrium adiabatic conditions. Because of the subtle nature of such hidden phases, their direct observation is extremely challenging and requires simultaneous visualization of matter at subpicoseconds and subpicometer scales. Here, we show that a magnetite crystal in the vicinity of its metal-to-insulator transition evolves through different hidden states when controlled via energy-tuned ultrashort laser pulses.
View Article and Find Full Text PDFEngineering Charge Density Waves by Stackingtronics in Tantalum Disulfide.
Nano Lett
May 2024
School of Materials Science and Engineering, Peking University, Beijing 100871, China.
In the realm of condensed matter physics and materials science, charge density waves (CDWs) have emerged as a captivating way to modulate correlated electronic phases and electron oscillations in quantum materials. However, collectively and efficiently tuning CDW order is a formidable challenge. Herein, we introduced a novel way to modulate the CDW order in 1T-TaS via stacking engineering.
View Article and Find Full Text PDFStructural dynamics at surfaces by ultrafast reflection high-energy electron diffraction.
Struct Dyn
March 2024
Department of Physics and Center for Nanointegration CENIDE, University of Duisburg-Essen, Lotharstrasse. 1, 47057 Duisburg, Germany.
Many fundamental processes of structural changes at surfaces occur on a pico- or femtosecond timescale. In order to study such ultrafast processes, we have combined modern surface science techniques with fs-laser pulses in a pump-probe scheme. Grazing incidence of the electrons ensures surface sensitivity in ultrafast reflection high-energy electron diffraction (URHEED).
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