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
525 2016-11-11 13:30  #1323(E6-2. 1st fl.)  Bandgap Engineering of Black Phosphorus
524 2016-07-08 11:00  #1323(E6-2. 1st fl.)  Isostatic magnetism
523 2016-07-07 14:00  #1323(E6-2. 1st fl.)  Let there be topological superconductors
522 2017-02-01 14:00  #1323(E6-2. 1st fl.)  Quantum electron optics using flying electrons
521 2016-11-16 16:00  #1323(E6-2. 1st fl.)  Realizing Haldane Model in Fe-based Honeycomb Ferromagnetic Insulators
520 2018-10-19 10:00  #1323, E6-2  Energy conversion processes during magnetic reconnection in a laboratory plasma file
519 2018-10-04 16:00  #1323, E6-2  Engineering light absorption in an ultrathin semiconductor metafilm file
518 2018-05-31 16:00  #1323, E6-2  Dynamic control of optical properties with gated-graphene metamaterials file
517 2019-12-05 16:00  #1323, E6-2  Subwavelenth Photonic Devices: From Single Photon Sources to Solar Cell file
516 2019-10-15 16:00  #1323, E6-2  Moiré superlattices and graphene quasicrystal file
515 2019-11-05 16:00  #1323, E6-2  Study on nanomaterials by the development of ultrahigh resolution laser-photoelectron microscopy (PEEM) file
514 2018-10-16 10:00  #1323, E6-2  Capturing protein cluster dynamics and gene expression output in live cells file
513 2018-11-01 16:00  #1323, E6-2  Direct holography from a single snapshot file
512 2018-11-21 15:00  #1323, E6-2  Engineering topological quantum physics at the atomic scale file
511 2018-05-09 16:00  #1323, E6-2  Recent advances in thermoelectric bulk composites file
510 2018-10-11 16:00  #1323, E6-2  Dirac electrons in a graphene quasicrystal file
509 2018-10-15 16:00  #1323, E6-2  Universal properties of macroscopic current-carrying systems file
508 2019-09-18 16:00  #1323, E6-2  Exploring Synthetic Quantum Matter in Superconducting Circuits file
507 2019-12-18 16:00  #1323, E6-2  Road to Higher Tc Superconductivity file
506 2019-10-25 15:00  #1323, E6-2  Physics Seminar file