visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나
날짜 2023-03-17 11:00 
일시 Mar. 17 (Fri) 11:00AM 
장소 E6-2 #1323 
연사 유효빈 (서강대학교 물리학과 교수) 
* Title:Operando electron microscopy investigation of domain dynamics in twisted van der Waals materials
 
* Speaker: 유효빈 (서강대학교 물리학과 교수)
 
* Date: 2023. 3. 17.(금) 11:00
 
* Place: E6-2 #1323
 
* Abstract
Control of interlayer stacking angle in two-dimensional (2-D) van der Waals (vdW) heterostructure enables one to engineer the crystal symmetry to imprint novel functionality. By stacking two layers of transition metal dichalcogenides (TMD) with designed twist angle, one can break the inversion symmetry and thereby develop vertical electric polarization. The direction of the electric polarization can be switched electrically, suggesting that the twisted bilayer TMD can host ferroelectricity. Such ferroelectricity reported in twisted bilayer vdW system is distinguished from conventional ferroelectrics in that the lateral sliding of the constituent layers induces vertical electric polarizations. Due to the reduced dimension, the ferroelectric domains do not require forward growth along the third dimension, suggesting unconventional 2-D domain dynamics under an applied electric field.
Here we employ operando transmission electron microscopy (TEM) to investigate the domain dynamics in 2-D vdW ferroelectrics. Operando TEM technique enables one to examine the structural change in the environment that mimics the device operating condition. On a thin SiN based TEM compatible platform, we fabricated double capacitor structure on 2D vdW ferroelectrics. Electrical gating in double capacitor structure and real time observation of structural change in a simultaneous manner provides an insight onto the switching mechanism of the 2-D vdW ferroelectrics.
 
Attached: C.V
번호 날짜 장소 제목
322 2021-04-02 14:30  Online(Zoom)  Quantum computing and entanglement generation using trapped ions and photons
321 2021-03-25 16:00  Online Seminar (Zoom)  Search for dark matter axion with Rydberg atoms file
320 2021-03-02 16:00  Online  Sensitive terahertz detection with graphene-based transistors file
319 2021-02-17 09:00  Online  석학 대중 강연 및 강의 시리즈 file
318 2021-02-15 17:00  Zoom  Magnetic Cluster Octupole Domain evolutation in chiral antiferromagnets file
317 2021-02-02 14:30  Zoom  Quantum- & Nano-Photonics 세미나(Integrated Nanophotonics with Metamaterials, Microcomb, and Atomic Systems) file
316 2021-01-28 18:00  Online Seminar  Quantum metamaterials: concept, theory, prototypes and possible applications file
315 2021-01-28 15:00  Zoom  Topological Transport of Deconfined Hedgehogs in Magnets file
314 2020-12-23 10:00  Online  Online workshop for Quantitative Phase Imaging file
313 2020-12-11 16:00  online  Atomic and electronic reconstruction at van der Waals interface in twisted 2D materials
312 2020-12-11 14:30  online  Antisymmetric interlayer exchange coupling in magnetic multilayers
311 2020-12-10 13:55  Zoom  Consistency of Boltzmann equation and light dark matter from inflaton decay
310 2020-12-09 10:00  Zoom  Searching for the QCD axion with the ARIADNE experiment file
309 2020-12-02 10:00  Zoom  Recent progress in Axion Dark Matter eXperiment (ADMX) technology file
308 2020-11-26 16:00  Online(Zoom)  2020 가을학기 광학분야 특별세미나(Light Engineering Beyond the Diffraction Limit)
307 2020-11-20 16:00  Online  Coherent control of field gradient induced quantum dot spin qubits
306 2020-11-20 14:30  Online  Lumpy Cooper pairs in an iron-based superconductor
305 2020-11-17 12:00  Online(Zoom)  Quantum- & Nano-Photonics" 세미나 시리즈 file
304 2020-11-12 16:00  E6-2 1323  2020 가을학기 광학분야 특별세미나
303 2020-10-23 14:00  E6-2 #1323  Plasmon spectroscopy of low-dimensional superconductors in fluctuating regime file