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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



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 일시 장소 연사 제목
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141 2015/03/09-06/08  E6, 1501  최현용교수(연세대) 외12명  Physics Colloquium : 2015 Spring file
140 2010/02/08-05/03  E6, 1501  최인수교수(서울대) 외  Physics Ciolloquium : 2010 Spring file
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136 2015/10/14, 6PM  KAIST Munji Campus Supex Hall  이창환 교수 (부산대학교 물리학과)  인터스텔라 영화 속의 물리 file
135 2009/09/07-11/30  E6, 1501  이주영박사(KIAS) 외  Physics Colloquium : 2009 Fall file
134 2017/03/06 - 05/29  Seminar Room 1501  이종봉 박사 (POSTECH) 외  Spring 2017: Physics Colloquium file
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131 2014/03/10-06/09  E6, 1501  신용일교수(서울대)  Physics Colloquium : 2014 Spring file
130 2011/05/16, 4PM  E6, 1501  서민교교수(KAIST)  Photonics with surface plasmon polaritons
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126 2016/03/11-06/09  E6-2, 1501 외  박권(KAIS) 외  Physics Seminar Serises : 2016 Spring file
125 2015/09/07-12/01  E6, 1501  문은국 교수(KAIST) 외  Physics Colloquium : 2015 Fall file
124 2011/09/03-12/06  E6, 1501  김용균교수(한양대) 외  Physics Colloquium : 2011 Fall file
123 2013/03/11-06/10  E6, 1501  강명수교수(KAIST) 외  Physics Colloquium : 2013 Spring