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장소 E6-2(1st fl) #1323 
일시 Sep. 02(Fri) 4:00 PM 
연사 Dr. Yong-Joo Doh, Department of Physics and Photon Science, GIST 

Quantum Electrical Transport in Topological Insulator Nanowires

 

Sep. 02(Fri) 4:00 PM, E6-2(1st fl) #1323
Dr. Yong-Joo Doh, Department of Physics and Photon Science, GIST


Abstract:
Single-crystalline nanostructures of β-Ag2Se and Bi2Se3, three-dimensional(3D) topological insulators (TIs), were synthesized using the chemical vapor transport method. The topological surface states were verified by measuring electronic transport properties such as the weak antilocalization effect, Aharonov-Bohm oscillations, and Shubnikov-de Haas oscillations.[1,2] The band inversion in β-Ag2Se is attributed to a strong spin-orbit coupling and Ag-Se bonding hybridization. The superconducting junctions of β-Ag2Se nanostructures were also made using superconducting Al electrodes.[3] Very large supercurrent in the junction enables us to observe the macroscopic quantum tunneling behavior in the narrow junction limit, which is in contrary to the PbS-nanowire-based superconducting junctions[4]. Our observations would provide new meaningful information about 3D TIs, which could be useful for spintronics and superconducting quantum information devices applications.


1. J. Kim, A. Hwang, S.-H. Lee, S.-H. Jhi, S. Lee, Y. C. Park, S.-I Kim, H.-S. Kim, Y.-J. Doh*, J. Kim*, B. Kim*, ACS Nano (2016) 10, 3936.
2. H.-S. Kim, N.-H. Kim, Y. Yang, X. Peng, D. Yu, Y.-J. Doh*, (in preparation)
3. J. Kim, B.-K. Kim, H.-S. Kim, B. Kim*, Y.-J. Doh*, (in preparation).
4. B.-K. Kim, H.-S. Kim, Y. Yang, X. Peng, D. Yu, Y.-J. Doh*, ArXiv:1607.07151 (submitted).

 

Contact: Sung Jae Cho, Physics Dept., (sungjae.cho@kaist.ac.kr)

 

번호 일시 장소 연사 제목
공지 2019/09/18 - 12/5  Seminar Room #1323  Prof. David Schuster and etc.  Fall 2019: Physics Seminar Serises
공지 2019/09/02 - 12/09  Seminar Room 1501  이호성 박사 (한국표준과학연구원) and etc.  Fall 2019: Physics Colloquium
152 July 25(Thur.),4:00PM  E6-2, #1323  Prof.Bohm-Jung Yang  Band topology of twisted bilayer graphene file
151 July 21 - August 2  E6-2,# 5318  Junmou Chen/Thomas Flacke/Kaoru Hagiwara/Junichi Kanzaki/Chris Kelso/Jeong Han Kim/Kyoungchul Kong/Gabriel Lee/Hye-Sung Lee/Ian Lewis  Challenges and Opportunities in Theoretical Particle Physics 2019 file
150 July 2. 2018 (Monday) 3:00 PM  Seminar Room (C303), Creation Hall (3F), KAIST Munji Campus  Dr. Peter Winter (Argonne National Laboratory)  High Precision Magnetic Field Measurement for the Muon g-2 Experiment file
149 July 13, 2018 at 14:00  Room 5318, KAIST Natural Sciences Lecture Hall(E6).  Prof. Ian Lewis (The University of Kansas, Department of Physics & Astronomy)  Loop Induced Single Top Partner Production and Decay at the LHC
148 July 10 (Wed.), 04:00 PM-  Academic Cltural Complex (E9) 5층 스카이라운지  Prof. Sidney Nagel/Young-Kee Kim  Public Lectures file
147 Jul. 28 (Thu.) 4PM  #1323(E6-2. 1st fl.)  Prof. Johannes Pollanen, Jerry Cowen Chair of Experimental Physics at Michigan State University  Low Dimensional Electrons: On the Road to Hybrid Quantum Systems
146 Jul. 08 (Fri.) 2PM  #1323(E6-2. 1st fl.)  Dr. Junhyun Lee, Harvard University  Electronic quasiparticles in the quantum dimer model
145 Jul. 08 (Fri.) 11:00 AM  #1323(E6-2. 1st fl.)  Dr. Michael Lawler(Binghampton Univ. / Cornell Univ.)  Isostatic magnetism
144 Jul. 07 (Thu.) 2PM  #1323(E6-2. 1st fl.)  Dr. Eun Ah Kim, CORNELL UNIV.  Let there be topological superconductors
143 Jul 3rd, 2019 (Wed)  E6-2, 2501  Kyung Soo Choi  Many-body quantum electrodynamis (QED) with atoms and photons: A new platform for quantum optics" file
142 January 23, 2019  Rm. C303, Creation Hall (3F), Munji Campus  Mikko Mottonen  Ultrasensitive Microwave Bolometer: Opportunity for Axion Detectors file
141 January 17 (Fri), 4:00 PM  #1323, E6-2  Hiroki Ikegami  Symmetry Breaking and Topology in Superfluid 3He file
140 Jan.9 (Wed.), 04:00 PM  E6-2. 2nd fl. #2501  Dr. Heung-Sik Kim  Molecular Mott state in the deficient spinel GaV4S8 file
139 JAN. 7 (Mon), 03:00 PM  E6-2. 2st fl. #2501  Dr. Byoung min Kang  Many-Body Invariants for Multipoles in Higher-Order Topological Insulators file
138 February 21 (Thu.), 16:00 PM  #5313, E6-2  Prof. Diptimoy Ghosh  B-meson charged current anomalies - Theoretical status file
137 February 13th (Thur.), 16:30 PM  E6-6, #119  Dr. Seyoon Kim(University of Wisconsin-Madison)  Enhanced Light-Matter Interactions in Graphene with Noble Metal Plasmonic Structures file
136 February 12(Web.)  E6-2, #5318  Prof. Kunio Kaneta  From inflation to new weak-scale file
135 Feb. 25 - Jun 3  Rm. 1501 (E6)    Spring 2019: Physics Colloquium file
134 Feb. 12 (Mon), 3:00pm  #C303, (Creation Hall 3F, KAIST Munji Campus)  Dr. Byeongsu Yang, Kamioka Observatory, Univ. of Tokyo  The recent result of XMASS Experiment
133 Feb. 1 (Wed.), 2p.m.  #1323(E6-2. 1st fl.)  Dr. Michihisa Yamamoto, Department of Applied Physics, The University of Tokyo  Quantum electron optics using flying electrons