The formations of charge and lattice orders are generally coupled in charge density wave (CDW) materials. Although this situation is usually satisfied in a large class of two. dimensional materials, it falls short in describing the so-called CDW-like phase transition in layered TaTe, accompanied by anomalous low temperature transport properties and a periodic lattice distortion. Prof. Lanzara' group at Lawrence Berkeley National Laboratory recently studied the anomalous CDW phase transition of TaTe using APES and low-energy electron diffraction. Their data reveal the presence of a surprising quasi- one-dimensional Fermi surface with nesting condition. They find that the wave vectors of the Fermi surface nesting and periodic lattice distortion are different, suggesting the decoupled formation between charge and lattice orders. This work provides routes for forging unconventional CW phases and charge- lattice entanglement that would otherwise not be available in materials with fixed dimensionality.
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2D Crystal Consortium - Materials Innovation Platform (2DCC-MIP)
The 2DCC-MIP combines a vibrant in-house research effort focused on transformative advances in the synthesis and characterization of 2D chalcogenide layered materials with a robust external user program that provides access to expertise and state-of-the-art facilities. The 2DCC-MIP platform enables cutting edge research and discovery, across in-house research and the user program, on the synthesis and characterization of 2D chalcogenide materials by a national user community guided by four science drivers: Physics of 2D Systems, Epitaxy of 2D Chalcogenides, Next-generation 2D Electronics, and Advanced Characterization and Modeling.