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Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 39: Poster Tuesday: 2D Materials

O 39.11: Poster

Dienstag, 2. April 2019, 18:00–20:00, Poster D

Non-contact Energy Dissipation Through Charge Density Waves on 1T-TaS2 — •Dilek Yildiz, Marcin Kisiel, Urs Gysin, and Ernst Meyer — University of Basel, Department of Physics, Basel, Switzerland

Small amount of energy is dissipated when bodies separated by a few nanometers gap are in relative motion. Non-contact friction can be measured by a highly sensitive cantilever oscillating like a tiny pendulum over the surface. This phenomena have been studied in many systems revealing structural and electronic phase transitions, quantum dots, and graphene devices. Understanding the origin of various dissipation mechanisms is still a wide open problem. Such frictional nature of layered systems, such as charge density wave (CDW) systems awaits to be investigated. Different phases of CDW on 1T-TaS2, a layered transition metal dichalcogenide (TMD), can be observed at different temperatures. The phase transition between nearly-commensurate and commensurate phases occurs at 180 K. We studied the origin of non-contact energy dissipation mechanisms on nearly-commensurate and commensurate CDW on 1T-TaS2. We studied the effect of Mott insulating state on dissipated power. The low temperature experimental results indicate that the main dissipation mechanism is Joule dissipation on commensurate CDW phase and fluctuation driven dissipation is the main mechanism on nearly-commensurate CDW phase. The spectroscopy performed on nearly commensurate phase of CDW indicates that the source of the fluctuating force and dissipation is the collective movement of weakly pinned charge density waves at room temperature.

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