[9p-Z23-1~11] 4.6 Terahertz Photonics

▲ [9p-Z23-2] [INVITED] Terahertz spectroscopy for dynamics in Dirac and Weyl semimetals toward high-speed electronics and spintronics

〇Ryusuke Matsunaga¹、Natsuki Kanda¹、Takuya Matsuda¹ (1.ISSP. The Univ. Tokyo)

キーワード：terahertz, Dirac semimetal, Weyl semimetal

Recently nonlinear light-matter interaction in terahertz frequency has attracted considerable attention for fundamental interests in physics and photonics and also for finding novel functionalities of materials. Here we demonstrate room-temperature efficient THz harmonic generation with 3f=2.4 THz in a thin film of 3D Dirac semimetal Cd₃As₂. The unprecedented efficiency originating from intraband acceleration of massless electrons in the 3-dimensional material would open a new avenue for developing a novel THz frequency convertor.
We also report observation of the THz anomalous Hall effect in a Mn₃Sn thin film by a broadband polarization-resolved THz spectroscopy up to 6 THz. The large THz response in the antiferromagnets depending on the spin order paves the way for ultrafast readout of magnetism with THz current on device.