장소 | E6-2. 1st fl. #1323 |
---|---|
일시 | Mar. 16 (Fri.), 04:0 PM |
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
댓글 0
번호 | 일시 | 장소 | 연사 | 제목 |
---|---|---|---|---|
272 | Oct. 18 (Tue.), 1:30 PM | 1st fl. #1323(E6-2) | Dr. Chan-Ho Yang, Department of Physics, KAIST | "Visualization of oxygen vacancy in motion and the interplay with electronic conduction" |
271 | July 10 (Wed.), 04:00 PM- | Academic Cltural Complex (E9) 5층 스카이라운지 | Prof. Sidney Nagel/Young-Kee Kim |
Public Lectures
![]() |
270 | 2015/08/04, 11PM | B501, Room Red, KI bldg. 5nd fl. | Dr. Eric Jin Ser Lee(Univ. of Manitoba, Canada) | Propagation of ultrasound through two- and three-dimensional strongly scattering media |
269 | Jun. 1(Wed) 10:30 AM | BK21 Conference Room (#1318, E6-2) | Dr. Noriaki Horiuchi, Editor, Nature Photonics | Welcome to Nature Photonics |
268 | October 15, 2020 (Thursday | CAPP Seminar Room #C303, Creation Hall (3F), KAIST Munji Campus | Prof. Gil-Ho Lee (POSTECH) |
Graphene-based Josephson junction microwave bolometer
![]() |
267 | 2015/03/13, 2PM | Connect Room, KI Bldg. |
The 15th Innovative Workshop on Soft/Bio Materials
![]() | |
266 | 2015/12/09, 11AM | E4(KI Building), Connect room (2nd fl.) | Arjun G. Yodh (University of Pennsylvania) | Functional Imaging & Monitoring of Brain & Breast with Diffuse Light |
265 | 2015/12/17, 11:00AM | E4(KI Building), Matrix Hall (2nd fl.) | Dr. Jung-Hoon Park (Purdue University) | Wavefront engineering for in-vivo Deep brain imaging |
264 | 2015/07/23,1:30PM | E4, B401 | Prof. Gilles Lérondel (Univ. of Technology of Troyes) |
Enhanced ZnO based UV photonics and related applications
![]() |
263 | Apr. 13(Wed.) 10:30Am | E6 #1323/zoom | Mingu Kang (Max Planck POSTECH Korea Research Initiative) | Harnessing topology and correlations from singularities in 3d-kagome metals |
262 | Jan. 11th(Tue), 15:00 | E6 #1501 | Soyeun Kim(UIUC) |
Ultrafast optical studies on CDW collective modes of the Weyl-CDW (TaSe4)2I
![]() |
261 | Jan. 26th (Tue), 13:00 | E6 #1501 | Dr. Hyojin Jung (NIMS) |
An Introduction to Cohomology groups
![]() |
260 | Jan. 25th (Tue), 15:00 | E6 #1501/online | Junhyun Lee (Rutgers, the State University of New Jersey) |
Emulating twisted double bilayer graphene with a multiorbital optical lattice
![]() |
259 | 10AM, 31th Mar. | E6 #1501/zoom | Dr. Samuel Begg (APCTP) |
Weiss fields for Quantum Spin Dynamics
![]() |
258 | 10AM, 29th Mar. / 13:30 PM, 30th Mar. | E6 #1501/zoom, E6 #2502/zoom | Dr. RYO HANAI (APCTP) |
Non-reciprocal phase transitions
![]() |
257 | 4pm, 28th April | E6 1323 | 유경식 (KAIST 전기및전자공학부) | (광학분야 특별세미나)Adiabaticity and symmetry in optical waveguide design |
256 | 4pm, 14th April | E6 1323 | 신승우 (KAIST 물리학과) | (광학분야 특별세미나)Holographic tomography of dielectric tensors at optical frequency |
255 | 4pm, 10th May | E6 1323 | 권혁준 (Korea Institute for Advanced Study, KIAS) | (광학분야 특별세미나)Testing quantum thermodynamics using quantum optics |
254 | 4pm, 26th May | E6 1323 | 황민수 (Department of Physics, Korea University) | (광학분야 특별세미나)Topological photonic devices |
253 | June 23th (Thur), 11:00 | E6 Room(#1322) | Sun Yool Park(Joint Institute for Laboratory Astrophysics (JILA) & University of Colorado) |
JILA’s search for the electron’s Electric Dipole Moment (eEDM) to probe physics beyond the standard model
![]() |