visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나
날짜 2018-03-16 16:00 
일시 Mar. 16 (Fri.), 04:0 PM 
장소 E6-2. 1st fl. #1323 
연사 Dr. YoungDuck Kim 

Abstract:

van der Waals materials including graphene, hexagonal boron nitride 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. However, nature of 2D materials, extremely sensitive to extrinsic effects, hampered efforts to observe its intrinsic transport. Recently developed ‘van der Waals heterostructure device platform’ allows the atomically perfect interface, dramatic suppression of extrinsic scattering effects, resulting in the achievements of dramatic improvements in performance with long-term stability. Especially, hBN-encapsulation structure of TMDCs with multi-terminal with low contact resistance strategies enables the observation of intrinsic transports such as quantum oscillations and coupled spin-valley physics. Furthermore, van der Waals heterostructure offer an entirely new opportunity for exploring the emerging exotic quantum behaviors in two-dimension such as 2D superconductivity, charge density wave in NbSe2 and 1T-TaS2.

I will also talk about the van der Waals material based ultrafast optical optoelectronics. Especially, ultrafast light emitter in nanoscale is a critical component in the development of the high bandwidth on-chip optical interconnects for ubiquitous computing and Big data applications. 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 ~ 4 GHz with broad optical bandwidth (400 ~ 1600 nm). Furthermore, atomically thin hexagonal boron nitride (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.

Contact: SunYoung Choi, (sunyoungchoi@kaist.ac.kr)

Center for Quantum Coherence in Condensed Matter, KAIST

 

Yongseop Kang (Mr.)

Manager, Administration Team of Department of Physics

Korea Advanced Institute of Science and Technology

Phone +82 (42) 350 2599

Cell phone +82 (10) 4288 6113

Email kangys@kaist.ac.kr

번호 날짜 장소 제목
공지 2022-11-25 11:00  E6-2 #1323  [Update 세미나영상](응집물리 세미나) DMFT+ NRG: From models to real materials, from local to nonlocal correlations
148 2018-12-07 16:00  E6-2. 1st fl. #1323  Novel probes of interacting electrons in 2D systems file
147 2018-12-07 14:30  E6-2. 1st fl. #1323  Spin generation from heat and light in metals file
146 2018-11-09 16:00  E6-2. 1st fl. #1323  Quantum sensing and imaging with diamond defect centers for nano-scale spin physics file
145 2018-11-09 14:30  E6-2. 1st fl. #1323  Moiré superlattices – from twisted bilayer graphene to quasicrystal file
144 2018-10-12 16:00  E6-2. 1st fl. #1323  Direct observation of a two-dimensional hole gas at oxide interfaces file
143 2018-10-12 14:30  E6-2. 1st fl. #1323  Quantum Advantage in Learning Parity with Noise file
142 2018-06-01 11:00  E6-2. 1st fl. #1323  Topological phases in low-dimensional quantum materials file
141 2018-05-17 13:30  E6-2. 1st fl. #1323  Quantum Spin Liquid in Kitaev Materials file
140 2018-05-11 16:00  E6-2. 1st fl. #1323  암페어 단위 재정의와 단전자 펌프 소자 개발 file
139 2018-05-11 14:30  E6-2. 1st fl. #1323  Disordered Floquet topological insulators file
138 2018-04-09 11:00  E6-2. 1st fl. #1323  Doublon-holon origin of the subpeaks at the Hubbard band edges file
» 2018-03-16 16:00  E6-2. 1st fl. #1323  Van der Waals Heterostructures from Quantum Transport to Ultrafast Optoelectronics file
» 2018-03-16 16:00  E6-2. 1st fl. #1323  Van der Waals Heterostructures from Quantum Transport to Ultrafast Optoelectronics file
135 2018-03-16 14:30  E6-2. 1st fl. #1323  산화물 다층박막에서의 다양한 물리현상 file
134 2018-03-16 14:30  E6-2. 1st fl. #1323  산화물 다층박막에서의 다양한 물리현상 file
133 2017-09-22 16:00  E6-2. 1st fl. #1323  Unexpected Electron-Pairing in Integer Quantum Hall Effect file
132 2017-09-22 14:30  E6-2. 1st fl. #1323  Quantum Electronic Transport in Graphene Hybrid Nanostructures file
131 2017-09-22 13:00  E6-2. 1st fl. #1323  Superconductor-metal-insulator transition in thin Tantalum films file
130 2017-06-02 14:30  E6-2. 1st fl. #1323  Quasiparticle Interference and Fourier transform scanning tunneling spectroscopy in WTe2 (Weyl semimetal) file
129 2017-05-12 13:30  E6-2. 1st fl. #1323  Topological Dirac insulator