• HOME
  • >
  • 소식
  • >
  • 세미나
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

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., (


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
8 2016/1/11, 4PM  E6-2, #1323  Dr. B.J.Kim (Max Planck Institute for Solid State Research)  Mott Physics in the Strong Spin-Orbit Coupling Regime
7 Apr. 5 (Tue.), 4PM  E6-2. 1st fl. #1322  Dr. Ara Go, Columbia University  A new impurity solver for multi-orbital systems: adaptive truncation of the Hilbert space
6 April 6, 2016 (Wed), 3:30 PM  E6-2, RM #1323  Dr. Andrei Matlashov (Los Alamos National Laboratory)  Superconducting Quantum Interference Devices for Precision Detection
5 Dec. 12th (Mon)  1:30p.m. #1323(E6-2. 1st fl.)  Dongjoon Song , AIST  “Possible symmetry in the phase diagrams of electron- & hole-doped cuprate high-Tc superconductors”
4 Oct. 25 (Fri), 15:00 ~  #1323, E6-2  Daesu Lee,Junwoo Son,MyungJoon Han ,Siheon Ryee,Eun-Gook Moon  Physics Seminar file
3 Thursday, December 14, 2017 at 3:00 pm  Seminar Room (C303), Creation Hall (3F), KAIST Munji Campus  Chunglee Kim (KASI)  Exploring the Universe via GWs in the era of multi-messenger astronomy
2 2015/12/09, 2PM  E6-2, #1323  Arjun G. Yodh (University of Pennsylvania)  SWELLABLE COLLOIDAL PARTICLES ARE SWELL
1 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