visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나

2020 가을학기 광학분야 특별세미나

2020.11.10 08:21

admin 조회 수:6746

날짜 2020-11-12 16:00 
연사  
장소 E6-2 1323 

Title: Two-dimensional van der Waals Heterostructures for Next-generation Light Source

 

Speaker: (Department of Physics, Kyung Hee University) 교수님 (Young Duck Kim) 김영덕

 

Place: E6-2 1323

(Available seats are very limited.Please enroll your information in this link to get access:   https://forms.gle/rZv77u2dsptVMZuy6 )

 

Online address (zoom): https://kaist.zoom.us/j/93997220310

 

Date: 4pm, 11/12

 

Abstract

Two-dimensional (2D) van der Waals materials including graphene, hexagonal boron nitride (hBN) and transition metal dichalcogenides (TMDCs) such as MoS2 and WSe2 have great potential for exploring the exotic quantum behaviors and realization of advanced optoelectronics devices. Especially, ultrafast light emitter in nanoscale is a critical component in the development of the high bandwidth on-chip optical interconnects. However, previous technology faces the major challenges such as big footprint, high cost integration and difficulties of direct high speed electrical pumping. Here, I will talk the first electrically driven ultrafast graphene light emitter that exhibits the ultrafast light modulation up to ~ 10 GHz with broad spectral range (visible to near infrared). Atomically thin hBN encapsulation layers to graphene allow the stable and practical high performance even under the ambient condition as well as efficient direct electronic cooling via near-field coupling of hybrid plasmon-phonon polaritonic modes. Ultrafast and broadband graphene light emitter paves the way towards the realization of complete graphene-based ultrafast optical communications.  I will also present the near UV (~390nm) electroluminescence (EL) and broadband photodetection from hBN heterostructures. Near UV EL in hBN are attributed to the electric field induced artificial color centers, which are vacancy-related defects with an excitonic mode in the intrinsic band gap of hBN (> 6 eV). These results demonstrate the promise of hBN-based van der Waals heterostructures for light sources and optoelectronics in the near UV to the visible regime. 

 

주관: 라영식 교수

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)
393 2019-04-19 16:00    Graphene and hBN heterostructures file
392 2019-04-23 16:00    From Mott physics to high-temperature superconductivity file
391 2019-04-26 16:00    Robust Quantum Metrology using Strongly Interacting Spin Ensembles and Quantum Convolutional Neural Network file
390 2019-05-01 16:00    Raman and x-ray scattering study on correlated electron systems: two case examples file
389 2019-05-02 16:00    Anomalous optical properties of halide perovskites file
388 2019-05-03 11:00    Exotic Magnetism file
387 2019-05-08 16:00    Imaging valley dependent electron transport in 2D semiconductors file
386 2019-05-09 16:00    Quantum Optical Sensing Using Single Photons And Single Photon Emission from Single Emitters file
385 2019-05-21 16:00    Classification of flat bands according to the band-crossing singularity of Bloch wave functions file
384 2019-05-24 16:00    Infrared spectroscopy study on metal-insulator transitions in layered perovskite iridates file
383 2019-05-30 16:00    Tuning the excitonic properties of semiconductors with light-matter interactions file
382 2019-05-31 11:00    Cavity QED with Spin Qubits file
381 2019-06-04 17:00    Stochastic nature of bacterial eradication using antibiotics file
380 2019-06-12 15:00    The relation between free and interacting fermionic SPT phases file
379 2019-06-17 10:30    Chiral Spintronics file
378 2019-06-24 11:00    Topological photonic anomalies file
377 2019-06-27 14:00    Gapless Kitaev Spin Liquid to Loop and String Gases file
376 2019-06-28 13:30    Magnetic domains and domain wall conduction in pyrochlore iridate thin films and heterostructures file
375 2019-06-28 14:00    1st Research-exchange meeting of computational material physics file
374 2019-07-03 15:00    Many-body quantum electrodynamis (QED) with atoms and photons: A new platform for quantum optics" file