[16p-Z05-1~9] 量子マテリアルとTHz-赤外光電場が拓くフォトニクス応用

▲ [16p-Z05-7] THz spintronics using Magnetic Heterostructures and Topological Materials

〇Hyunsoo Yang¹ (1.National Univ. of Singapore)

キーワード：THz, spintronics, topological materials

A breakthrough on THz spintronics is the generation of THz current via laser driven picosecond spin to charge conversion. This opens up a route not only to novel THz emitters [1,2], but also potential spintronic devices manipulating the magnetization on a picosecond timescale. By integrating our spin based THz emitter with a photoconductive antenna, 2–3 order enhancement of the THz signals in a lower THz frequency range (0.1–0.5 THz) is achieved [3]. The emitted THz waves from magnetic heterostructures also help to characterize various materials, such as 2D materials, topological insulators, and Weyl semimetal [4-6]. Not much is known for the propagation of magnons in antiferromagnetic materials so far. Using THz emission measurements sub-picosecond magnon currents can be identified through the antiferromagnetic NiO layer, which can even manipulate the magnetization [7].

[1] Y. Wu et al., Adv. Mat. 29, 1603031 (2017)
[2] M. Chen et al., Adv. Opt. Mat. 6, 1800430 (2018)
[3] M. Chen et al., Adv. Opt. Mat. 7, 1801608 (2019)
[4] L. Cheng et al., Nat. Phys. 15, 347 (2019)
[5] X. Wang et al., Adv. Mater. 30, 1802356 (2018)
[6] M. Chen et al., ACS Nano 14, 3539 (2020)
[7] Y. Wang et al., Science 366, 1125 (2019)