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The 931st IMS colloquium [1/3]

Lecture Title "Quasi-Particle Interference Studies of Low-Dimensional Quantum Materials"
Date Tuesday 23 April 2019 15:00
Lecturer Prof. Chun-Liang Lin (Department of Electrophysics, National Chiao Tung University, Taiwan)
Place

IMS Research Building Room 201

Summary

Low-dimensional quantum materials have become promising materials for next generation devices. Because of the huge diversity among them, to characterize their properties is an urgent issue. In this presentation, the electronic properties inside low-dimensional quantum materials such as silicene [1, 2]layered bismuth [3], and transition metal dichalcogenides (TMDs) [4, 5] are investigated by quasiparticle interference (QPI) based on scanning tunneling microscopy (STM). For example, the real-space observations of multilayer silicene and WTe2 are shown in Fig. 1 and Fig. 2, respectively. After the fast Fourier transformation (FFT), these real-space images can provide the information of wavenumbers (κ) of scattered quasiparticles at specific energy (Ε). By collecting large numbers of images at different energy, the Ε‐κ plots reveal the intrinsic electronic structures of both materials. The results provide answers to several crucial questions related to these low-dimensional quantum materials and stimulate further exploration of the characteristics of new materials. 

[1] Appl. Phys. Express 5 (2012) 045802. [2] Phys. Rev. Lett. 110 (2013) 229701. [3] Appl. Phys. Lett. 107 (2015) 031602. [4] ACS Nano 11 (2017) 11459. [5] J. Phys.: Condens. Matter 30, (2018) 105703
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For more information here.

Other

Contact : Hiroshi Yamamoto
(Research Center of Integrative Molecular Systems)
Norie Momiyama & Genki Kobayashi
(IMS colloquium FY2019 committee)