Quasiparticle Interference and Fourier transform scanning tunneling spectroscopy in WTe2 (Weyl semimetal)
2017.06.01 12:25
장소 | E6-2. 1st fl. #1323 |
---|---|
일시 | Jun. 2 (Fri.), 02:30 PM |
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.
댓글 0
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 |
279 | Nov. 20 (Fri.), 04:00 PM | Online | Dr. Dohun Kim | Coherent control of field gradient induced quantum dot spin qubits |
278 | Nov. 20 (Fri.), 02:30 PM | Online | Dr. Doohee Cho | Lumpy Cooper pairs in an iron-based superconductor |
277 | Dec. 11 (Fri.), 02:30 PM | online | Myung Hwa Jung(Sogang Univ.) | Antisymmetric interlayer exchange coupling in magnetic multilayers |
276 | Dec. 11 (Fri.), 04:00 PM | online | Hyobin Yoo(Sogang Univ.) | Atomic and electronic reconstruction at van der Waals interface in twisted 2D materials |
275 | Dec.23(Wed), 10:00~16:00 | Online | Prof. YongKeun Park (KAIST) and etc. |
Online workshop for Quantitative Phase Imaging
![]() |
274 | 2016/09/05-12/12 4PM | Natual Scien Bldg.(E6)m #1501 | Yeong Kwan Kim 외 |
Physics Colloquium : 2016 Fall
![]() |
273 | May 19, 2016 (Thur.) 3PM | May 19, 2016 (Thur.) 3PM, | Dr. Michael Betz, CERN | The CERN Resonant WISP Search: Development, Results and Lesson-Learned |
272 | 2017.1.9(Mon), 4PM | Lecture Hall, College of Natural Sciences [#1501,E6-2] | Prof. John Michael Kosterlitz, Brown University |
Topological Defects and Phase Transitions"
![]() |
271 | 4월 18일(월), 15:30~ | KI빌딩(E4), 강의실 B501 (5F) | Prof. Robert A. DiStasio Jr. (Cornell University) |
First Principles Approaches for Intermolecular Interactions: From Gas-Phase Dimers to Liquid Water and Molecular Crystal Polymorphism
![]() |
270 | 2014/05/28, PM5 | KI Building, Matrix Hall | 이웅범 대표이사(LG이노텍) | 부품소재산업이 미래다 |
269 | Aug. 4, 2016 (Thu.), 2:30 pm | KAIST Natural Science Building (E6-5), EDU 3.0 Room(1st fl.) | Prof. Argyris Nicolaidis | Relational Logic (with applications to Quantum Mechanics, String Theory, Cosmology, Neutrino Oscillations, Statistical Mechanics) |
268 | April 4, 2016 (Mon) - April 8, 2016 (Fri) | KAIST Natural Science Building (E6-2), RM #4314 | Dr. Fritz Caspers (CERN) | Radio frequency engineering |
267 | 2015/10/14, 6PM | KAIST Munji Campus Supex Hall | 이창환 교수 (부산대학교 물리학과) |
인터스텔라 영화 속의 물리
![]() |
266 | #1323(E6-2. 1st fl.) | Jul. 10th (Mon), 4pm | Dr. Duk Young Kim Los Alamos National Laboratory |
“Intertwined Orders in a Heavy-fermion metal”
![]() |
265 | April 6, 2017 (Thu), 4:00 pm | IBS CAPP seminar room, Creation Hall (3F), KAIST Munji Campus | Prof. Youngjoon Kwon (Yonsei University) | For whom the Belle tolls |
264 | Oct. 16 (Fri.), 02:30 PM | https://kaist.zoom.us/j/89198078609 | Dr. Chulki Kim |
Nanoscale magnetic resonance detection towards nano MRI
![]() |
263 | Oct. 16 (Fri.), 04:00 PM | https://kaist.zoom.us/j/89198078609 | Dr. Daesu Lee |
Hidden room-temperature ferroelectricity in CaTiO3 revealed by a metastable octahedral rotation pattern
![]() |
262 | Oct 9 (Fri), 09:00 AM | https://kaist.zoom.us/j/85161896513?pwd=U3pwWFFZaWVRamxDZUR5REhNeVk0UT09 | Prof. Tim Hsieh (Perimeter Institute) |
Quantum Many-Body Simulation
![]() |
261 | October 15, 5:00pm | https://bit.ly/3ndIiJn | Dr. Samuli Autti |
Time crystals, quasicrystals, and time crystal dynamics in the superfluid universe
![]() |
260 | May 13 (Fri.) 4 PM | E6. #1501(1st fl.) | Dr. Hosub Jin, Dept. of Physics, UNIST | Graphene analogue in (111)- BaBiO3 bilayer heterostructures for topological electronics |