What is it about?
Phase transitions such as the transition from liquid water to ice have an anomalous behaviour precisely at the transition temperature where the specific heat and the expansion coefficients abruptly change. This work uses nanoscale vibrations of 2D materials to track a different type of a transition going from a normal state to a state called charge-density-wave state where the electron densities order themselves into a new lattice. Using this technique, we study a mechanism in which the charge-density-wave state can be enhanced.
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Why is it important?
Conventional methods which probe the anomaly in the specific heat of materials that undergo phase transitions are not adequate for individual flakes of 2D materials which are often only a few microns wide and few atomic layers thick. We use temperature dependent nanomechanics to extract the specific heat in small and thin flakes of 2D materials which are difficult to measure with conventional techniques. Additionally, we demonstrate that degradation in air can surprisingly enhance the charge-density-wave transition in tantalum disulfide.
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This page is a summary of: Study of charge density waves in suspended 2H-TaS2 and 2H-TaSe2 by nanomechanical resonance, Applied Physics Letters, May 2021, American Institute of Physics,
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