장소 | E6-2. 1st fl. #1323 |
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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
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공지 | 2019/09/02 - 12/09 | Seminar Room 1501 | 이호성 박사 (한국표준과학연구원) and etc. | Fall 2019: Physics Colloquium |
206 | Jun. 1(Wed) 10:30 AM | BK21 Conference Room (#1318, E6-2) | Dr. Noriaki Horiuchi, Editor, Nature Photonics | Welcome to Nature Photonics |
205 | July 2. 2018 (Monday) 3:00 PM | Seminar Room (C303), Creation Hall (3F), KAIST Munji Campus | Dr. Peter Winter (Argonne National Laboratory) |
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204 | 2015/10/16, 3PM | E6-2, 5th fl. #5318 | Dr. Pierre Pugnat , (CNRS-LNCMI) | High Magnetic Fields to Probe the sub-eV range of Particle/Astroparticle Physics - From the OSQAR experiments at CERN up to new perspectives at LNCMI-Grenoble |
203 | Nov. 9 (Fri.), 02:30 PM | E6-2. 1st fl. #1323 | Dr. Pilkyung Moon |
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202 | October 15, 5:00pm | https://bit.ly/3ndIiJn | Dr. Samuli Autti |
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201 | Jun. 2 (Fri.), 4:00 PM | #1323 (E6-2. 1st fl.) | Dr. Sang Wook Kim |
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200 | 2015/12/03, 4PM | E6-2, #1323 | Dr. Sang-Yun Lee (3rd institute of Physics, University of Stuttgart, Germany) | Hybrid solid state spin qubits in wide bandgap semiconductors |
199 | Mar. 24 (Fri.), 4:00 PM | #1323 (1st fl. E6-2) | Dr. SangWook Lee | Graphene based nano electronics and nano electromechanics; focusing on precise control of nano structures for studying accurate physical properties |
198 | Sep. 29th(Thu), 4PM | E6-2 #1323 (1st floor) | Dr. Sangyoon Han, Department of Physics, KAIST | Large-scale Silicon Photonic MEMS Switches |
197 | 2015/07/15, 2PM | E6-2,1323 | Dr. Se Young Park(Rutgers Univ.) | Electronic and optical properties of titanate-based oxide superlattices |
196 | June 17 (Mon.), 10:30 AM | #1323, E6-2 | Dr. See-Hun Yang |
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195 | Apr. 19 (Fri.), 04:00 PM | E6-2. 1st fl. #1323 | Dr. Seok Kyun Son |
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194 | 2016/1/26, 2PM | E6-2, #1323 | Dr. Sergei V. Kalinin (Center for Nanophase Materials Sciences, Oak Ridge National Laboratory) | Electrochemistry on Nano- and Atomic Levels: Scanning Probe Microscopy Meets Deep Data |
193 | Mar. 29 (Fri.), 02:30 PM | E6-2. 1st fl. #1323 | Dr. Seung Hyub Baek |
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192 | Jun. 01 (Fri.), 11:00 AM | E6-2. 1st fl. #1323 | Dr. Seung Sae Hong |
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191 | October 29 (Tue.), 4:00pm | #1323 (E6-2, 1st fl.) | Dr. Seung-Joo Lee |
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190 | Apr. 09 (Mon.), 11:00 AM | E6-2. 1st fl. #1323 | Dr. Seung-Sup B. Lee |
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189 | October 31 (Thu.), 10:00am | #1323 (E6-2, 1st fl.) | Dr. Seung-Sup Lee |
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188 | February 13th (Thur.), 16:30 PM | E6-6, #119 | Dr. Seyoon Kim(University of Wisconsin-Madison) |
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187 | November 20 (Wed.), 4:00 PM | #5302, E6-2 | Dr. Shigeyuki Ishida |
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