visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나
날짜 2017-06-02 14:30 
일시 Jun. 2 (Fri.), 02:30 PM 
장소 E6-2. 1st fl. #1323 
연사 Dr. Euyheon Hwang(황의헌) 

Quasiparticle Interference and Fourier transform scanning tunneling spectroscopy in WTe2 (Weyl semimetal)

 

Dr. Euyheon Hwang(황의헌)

SAINT and Department of Nanoscience and Technology, Sungkyunkwan University

 

Jun. 2 (Fri.), 02:30 PM

E6-2. 1st fl. #1323

 

Abstract: 

The effect of quasiparticle interference (QPI) on the spatial variations of the local density of states in topological Weyl semimetal will be presented. We consider the QPI on WTe2 which are known as the type II Weyl semimetals. The Weyl semimetals host topologically protected surface states, with arced Fermi surface contours that are predicted to propagate through the bulk when their momentum matches that of the surface projections of the bulk’s Weyl nodes. Recent progress in spectroscopic techniques has enabled the elucidation of various interesting aspects of the electronic states of Weyl semimetals in real and momentum spaces. A number of characteristic behaviors of interference are identified in the Fourier transformed scanning tunneling spectroscopy. We use the T-matrix approximation to analyze the effect of a localized impurity on the local density of states in WTe2. A comparison between our results and scanning tunneling microscopy experiments could provide a critical test of the electronic properties of WTe2. Our results reveal various different scattering wave vectors, which can be understood by taking into account the shape, spin texture, and momentum-dependent propagation of the Fermi arc surface states into the bulk. Our findings provide evidence that Weyl nodes act as sinks for electron transport on the surface of these materials.

번호 날짜 장소 제목
140 2017-09-22 16:00  E6-2. 1st fl. #1323  Unexpected Electron-Pairing in Integer Quantum Hall Effect file
139 2017-09-22 14:30  E6-2. 1st fl. #1323  Quantum Electronic Transport in Graphene Hybrid Nanostructures file
138 2017-09-22 13:00  E6-2. 1st fl. #1323  Superconductor-metal-insulator transition in thin Tantalum films file
137 2017-09-13 16:00  #1323 (E6-2. 1st fl.)  An Introduction to Quantum Spin Liquids file
136 2017-09-12 16:00  #1323 (E6-2. 1st fl.)  Exact Solution for the Interacting Kitaev Chain at Symmetric Point file
135 2017-08-31 14:00  #5318(E6-2. 5th fl.)  “Berry phase and nonlinear response: photocurrent in noncentrosymmetric insulators and Weyl semimetals” file
134 2017-08-16 16:00  #1322 (E6-2. 1st fl.)  Phonon-driven spin-Floquet valleytro-magnetism file
133 2017-07-14 15:00  #1323 (E6-2. 1st fl.)  Chiral anomaly in disordered Weyl semimetals file
132 2017-07-10 16:00  Jul. 10th (Mon), 4pm  “Intertwined Orders in a Heavy-fermion metal” file
131 2017-06-02 16:00  #1323 (E6-2. 1st fl.)  Maxwell's demon in quantum wonderland file
» 2017-06-02 14:30  E6-2. 1st fl. #1323  Quasiparticle Interference and Fourier transform scanning tunneling spectroscopy in WTe2 (Weyl semimetal) file
129 2017-05-12 13:30  E6-2. 1st fl. #1323  Topological Dirac insulator
128 2017-04-28 16:00  #1323 (E6-2. 1st fl.)  Carbon nanotubes coupled to superconducting impedance matching circuits
127 2017-04-28 14:30  E6-2. 1st fl. #1323  Hot electron generation at surfaces and its impact to catalysis and renewable energy conversion
126 2017-04-27 16:00  Seminar Room(#1323, E6-2)  반도체 양자점을 이용한 단광자 광원
125 2017-04-06 16:00  IBS CAPP seminar room, Creation Hall (3F), KAIST Munji Campus  For whom the Belle tolls
124 2017-04-05 12:00  Room 101, Creative Learning Bldg.(E11)  2017년 4월 첫수 융합포럼 개최 안내(물리학과 & 원자력 및 양자공학과 공동 개최)/The First Wednesday Multidisciplinary Forum in April 2017 organized by Dept. of Physics & Dept. of Nuclear & Quantum Engineering file
123 2017-03-24 16:00  #1323 (1st fl. E6-2)  Graphene based nano electronics and nano electromechanics; focusing on precise control of nano structures for studying accurate physical properties
122 2017-03-24 14:30  #1323 (1st fl. E6-2).  Topological Dynamics
121 2017-03-21 16:00  Seminar Room 1323  Spring 2017: Physics Seminar Serises file