visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나
날짜 2016-09-02 16:00 
연사  
장소 E6-2(1st fl) #1323 

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 날짜 연사 제목
공지 2025-02-24 16:00    2025년 봄학기 콜로키움 안내
공지 2025-02-27 16:00    2025년 봄 물리학과 특별세미나 (광학/응집물리 분야)
434 2018-10-04 16:00    Engineering light absorption in an ultrathin semiconductor metafilm file
433 2018-10-11 16:00    Dirac electrons in a graphene quasicrystal file
432 2018-10-12 14:30    Quantum Advantage in Learning Parity with Noise file
431 2018-10-12 16:00    Direct observation of a two-dimensional hole gas at oxide interfaces file
430 2018-10-15 16:00    Universal properties of macroscopic current-carrying systems file
429 2018-10-16 10:00    Capturing protein cluster dynamics and gene expression output in live cells file
428 2018-10-18 10:00    Understanding membrane protein folding using single-molecule force techniques file
427 2018-10-18 16:00    Applications of nonlinear optics for condensed matter researches file
426 2018-10-19 10:00    Energy conversion processes during magnetic reconnection in a laboratory plasma file
425 2018-10-24 10:30    Photonic integration of next-generation clocks and Hertz-absolute-accuarcy optical frequenncy synthesizers file
424 2018-10-25 16:00    Abelian and non-Abelian dark photons file
423 2018-10-26 16:00    Coexisting triple-point and nodal-line topological magnons and thermal Hall effect in pyrochlore iridates file
422 2018-11-01 16:00    Direct holography from a single snapshot file
421 2018-11-08 16:00    Conformality lost file
420 2018-11-09 14:30    Moiré superlattices – from twisted bilayer graphene to quasicrystal file
419 2018-11-09 16:00    Quantum sensing and imaging with diamond defect centers for nano-scale spin physics file
418 2018-11-21 15:00    Engineering topological quantum physics at the atomic scale file
417 2018-11-22 15:00    Experimental and Computational Study on Physical Properties based on Granular System file
416 2018-11-23 15:00    Entanglement string and Spin Liquid with Holographic duality file
415 2018-11-29 16:00    양자 칸델라 실현을 위한 단일 광자 발생장치 개발 file