Lattice Dynamics Driven by Tunneling Current in 1T′ Structure of Bilayer VSe2
| Autor: | Jungdae Kim, Byoung Ki Choi, Ganbat Duvjir, Baatarchuluun Tsermaa, Young Jun Chang |
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| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Physics Condensed matter physics Bilayer General Physics and Astronomy Linearity 02 engineering and technology Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 021001 nanoscience & nanotechnology Transition rate matrix 01 natural sciences Power law law.invention law 0103 physical sciences Atom Current (fluid) Scanning tunneling microscope 0210 nano-technology Spectroscopy |
| Zdroj: | Journal of the Korean Physical Society. 77:1031-1034 |
| ISSN: | 1976-8524 0374-4884 |
| DOI: | 10.3938/jkps.77.1031 |
| Popis: | Interesting lattice dynamics were recently reported in 1T′ structure of bilayer VSe2 attributed to the vibration of Se atoms, but it was limited to topographic observation using scanning tunneling microscopy (STM). We conduct further systematic STM study to understand the origin of lattice dynamics in bilayer VSe2. Time spectroscopy of tunneling current is measured with the feedback loop disabled, while holding the position of the STM tip over a single Se atom. The time spectroscopy indeed shows random telegraph signals that tunneling current fluctuates between high and low currents. Such fluctuations of current reflect the vibrational motion of the Se atom. Statistical analysis described by the Markov process provides average residence time (τ) for high and low current states, and transition rate (R = 1/τ). Interestingly, the transition rate as a function of tunneling current (I) follows a power law of R = IN (N = constant), and the N value is close to 1. This linearity of transition rate indicates that the lattice dynamics are mostly induced by tunneling current. Our result confirms the role of tunneling current that drives the observed lattice dynamics in the bilayer VSe2. |
| Databáze: | OpenAIRE |
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