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 |
---|---|---|---|---|
196 | Oct. 27th(Thu) 4PM | #1323(E6-2) | Dr. 이 강 희, KAIST, Mechnical Engineering | Terahertz Metal Optics |
195 | June 28 (Fri.), 13:30 PM | #1323, E6-2 | Dr. Yusuke Kozuka |
Magnetic domains and domain wall conduction in pyrochlore iridate thin films and heterostructures
![]() |
194 | Apr. 08 (Fri.), 13:30 PM | E6-2. 1st fl. #1501 | Dr. Yunkyu Bang, Chonnam National Univ. | Theoretical Overview of Iron-based superconductors and its future |
193 | Sep. 26 (Tue.), 11AM | #1323 (E6-2. 1st fl.) | Dr. Yukiaki Ishida / ISSP, University of Tokyo | Time-resolved ARPES study of Dirac and topological materials |
192 | Nov. 1 (Fri.), 02:30 PM | E6-2. 1st fl. #1323 | Dr. YoungWook Kim |
Squeezing the best out of 2D materials
![]() |
191 | Apr. 19 (Fri.), 02:30 PM | E6-2. 1st fl. #1323 | Dr. YoungWoo Nam |
A family of finite-temperature electronic phase transitions in graphene multilayers
![]() |
190 | 2015/11/06, 4:30 PM | E6-2, #5318 | Dr. Youngkuk Kim (University of Pennsylvania) | Topological Dirac line nodes in centrosymmetric semimetals |
» | Mar. 16 (Fri.), 04:0 PM | E6-2. 1st fl. #1323 | Dr. YoungDuck Kim |
Van der Waals Heterostructures from Quantum Transport to Ultrafast Optoelectronics
![]() |
188 | Aug. 9 (Tue), 14:00 PM | KI building (E4), Lecture Room Red (B501) | Dr. YoungChan Kim (Quantum Biophotonics Group, University of Surrey, UK) |
Quantum biology in fluorescent protein: a new model system to study quantum effects in biology
![]() |
187 | May 13 (Fri.), 1:30 PM | E6. #1501(1st fl.) | Dr. Young-Woo Son, Dept. of Physics, KIAS | Aperiodic crystals in low dimensions |
186 | April 11 (Wed), 4:00pm | #1323 (E6-2, 1st fl.) | Dr. Young-Sik Ra |
Non-Gaussian states of multimode light generated via hybrid quantum information processing
![]() |
185 | May. 12 (Fri.), 01:30 PM | E6-2. 1st fl. #1323 | Dr. Young Kuk Kim | Topological Dirac insulator |
184 | May. 13 (Fri.), 04:00 PM | 자연과학동(E6-2) 1st fl. #1323 | Dr. Yosep Kim(Center for Quantum Information, KIST) |
High-fidelity iToffoli gate for fixed-frequency superconducting qubits
![]() |
183 | Jun. 10 (Fri.), 11:00 AM | Online seminar | Dr. Yoon Jang Chung(Laboratory for Physical Sciences, University of Maryland) |
Record-quality two-dimensional electron systems
![]() |
182 | April 11 (Wed), 1:30pm | #1323 (E6-2, 1st fl.) | Dr. Yongsoo Yang |
Probing 3D Structure and Physical Properties of Materials at the Single-Atom Level
![]() |
181 | October 15 (Mon.), 16:00 PM | #1323, E6-2 | Dr. Yongjoo Baek |
Universal properties of macroscopic current-carrying systems
![]() |
180 | Sep. 02(Fri) 4:00 PM | E6-2(1st fl) #1323 | Dr. Yong-Joo Doh, Department of Physics and Photon Science, GIST | Quantum Electrical Transport in Topological Insulator Nanowires |
179 | Sep. 02(Fri) 2:30 PM | E6-2(1st fl.), #1323 | Dr. Yong-Hyun Kim,Graduate School of Nanoscience and Technology, KAIST | Nanoscale Thermal Physics: Seebeck Effect and Nanoscale Friction |
178 | 2015/12/01, 4PM | E6-2, #1323 | Dr. Yeong Kwan Kim(Lawrence Berkeley National Laboratory, USA) | Introducing extra dimensions to spectroscopic studies of advanced quantum materials |
177 | 2015/11/10, 4PM | E6-2, #1323 | Dr. Woosuk Bang (Physics division, Los Alamos National Laboratory) | Rapid heating of matter using high power lasers |