visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나
날짜 2023-03-17 11:00 
연사  
장소 E6-2 #1323 
* 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 연사 제목
공지 2025-02-24 16:00    2025년 봄학기 콜로키움 안내
공지 2025-02-27 16:00    2025년 봄 물리학과 특별세미나 (광학/응집물리 분야)
334 2019-12-13 13:30    Biophysics Mini-symposium at KAIST file
333 2019-12-18 16:00    Road to Higher Tc Superconductivity file
332 2019-12-27 15:00    The superconducting order parameter puzzle of Sr2RuO4 file
331 2019-12-27 15:00    The superconducting order parameter puzzle of Sr2RuO4 file
330 2020-01-17 16:00    Symmetry Breaking and Topology in Superfluid 3He file
329 2020-02-12 13:00    From inflation to new weak-scale file
328 2020-02-13 16:30    Enhanced Light-Matter Interactions in Graphene with Noble Metal Plasmonic Structures file
327 2020-02-20 16:00    Unconventional superconductivity in the locally non-centrosymmetric heavy-fermion CeRh2As2 file
326 2020-07-02 16:00    An irreversible qubit-photon coupling for the detection of itinerant microwave photons file
325 2020-08-17 20:00    Using magnetic tunnel junctions to compute like the brain file
324 2020-08-25 20:00    KAIST Global Forum for Spin and Beyond (Second Forum) file
323 2020-09-11 14:00    SRC Seminar file
322 2020-09-14 17:30    KAIST Global Forum for Spin and Beyond (Third Forum) file
321 2020-09-22 09:30    Physics and applications of soliton microcombs(Quantum- & Nano-Photonics) file
320 2020-09-24 09:00    (CAPP/IBS)Searching for Dark Matter with a Superconducting Qubit , Cryogenic Microwave Circuit Development at the NSTU file
319 2020-09-28 17:30    KAIST Global Forum for Spin and Beyond(Fourth Forum) file
318 2020-10-09 09:00    Quantum Many-Body Simulation file
317 2020-10-15 16:00    Graphene-based Josephson junction microwave bolometer file
316 2020-10-15 16:00    Towards resource-efficient and fault-tolerant quantum computation with nonclassical light
315 2020-10-15 17:00    Time crystals, quasicrystals, and time crystal dynamics in the superfluid universe file