적외선분광물성연구실에서 독일 Universität Stuttgart의 노슬기 박사님을 초청하여 아래와 같이 세미나를 개최합니다.

학과 구성원 여러분의 많은 참석을 부탁 드립니다.

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○ Date/time: 2020. 2. 17 (Mon.) 14:00

○ Place: 물리학과 세미나실(31355호)

○ Speaker: 노슬기 박사님 (Physikalisches Institut, Universität Stuttgart, Germany)

○ Title: Magneto-optical study of the Dirac semimetal Cd3As2 in Voigt geometry

○ Abstract: The three-dimensional Dirac semimetals possess Dirac points, which can be considered as a superposition of two Weyl points in reciprocal space. Under a magnetic field, the spin degeneracy can be lifted and a pair of Weyl points with opposite chiralities connected by a zeroth Landau level appears, enabling the charge transfer between the two Weyl points- the so-called chiral pumping effect. In this study, Cd3As2 was investigated by optical spectroscopy under external static magnetic field, B. The Voigt geometry was employed to parallelize the electric field of incident light, E, and the static magnetic field. In the E perpendicular to B configuration, we observed a pronounced Voigt resonance due to the splitting of the plasma edge. In the E // B geometry, decrease of the Drude spectral weight was detected which can be interpreted as a transfer of spectral weight from the broad normal Drude to a sharp chiral pumping channel. In the talk, we will discuss the possible relation between this effect and our observations in more detail.