visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나
날짜 2018-03-16 16:00 
연사  
장소 E6-2. 1st fl. #1323 

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 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)
505 2022-01-26 13:00    An Introduction to Cohomology groups file
504 2018-10-12 16:00    Direct observation of a two-dimensional hole gas at oxide interfaces file
503 2022-11-18 14:30    Kondo cloud condensation in a highly-doped semiconductor metal file
502 2025-05-01 16:00  Dr. Inwook Kim (Lawrence Livermore National Laboratory)  BSM Physics Search with Quantum Sensors file
501 2018-12-26 16:00    Brane-like defect in 3D toric code file
500 2019-07-31 16:00    Features of ballistic superconducting graphene file
499 2018-07-12 17:00    The MilliQan Experiment: Search for Milli-Charged Particles at the LHC
498 2016-12-09 13:30    Entanglement area law in strongly-correlated systems
497 2023-11-23 16:00    Deciphering the Enigma of Quantum Materials by X-ray Scattering and Spectroscopy
496 2019-10-16 16:00    Emergent black holes and monopoles from quantum fields file
495 2022-07-14 13:30    Electronic structure and anomalous transport properties of topological materials by first principle calculation
494 2016-11-24 16:00    Harmonic oscillator physics with single atoms in a state-selective optical potential
493 2015-09-07 15:00    Advanced Optical Materials and Devices at NRL
492 2021-05-14 16:00    Spatial and temporal separation of environmental dephasing sources from solid-state quantum emitters file
491 2016-04-12 16:00    Confinement of Superconducting Vortices in Magnetic Force Microscopy
490 2017-04-28 14:30    Hot electron generation at surfaces and its impact to catalysis and renewable energy conversion
489 2015-12-11 15:45    Dynamical mean field theory studies on heavy fermion system
488 2023-10-19 11:00    Emergent functionalities of iridium oxide films with different growth orientation file
487 2023-06-26 11:00    Quantum computing on magnetic racetracks with flying domain wall qubits
486 2019-04-19 11:00    First-principles studies of semiconductors for solar cell applications file