■Preface
Veteran Members, Let's Make Contributed Talks in English at Annual Meetings!
Shuji Hasegawa......1

■Interdisciplinary
Economic Phenomena and Complex Network Science
Yoshi Fujiwara......4

■Researches
Terahertz Higher Harmonic Generation in a Three Dimensional Dirac Semimetal
Ryusuke Matsunaga, Natsuki Kanda, and Tatsuhiko N. Ikeda......12

Spin Coherence of Solid-State Spin Qubit
Shun Kanai......18

Non-Destructive Elemental Analysis of the C-type Asteroid Ryugu with Negative Muon Beams―Determination of Bulk Chemistry of Ryugu Samples
Kentaro Terada and Kazuhiko Ninomiya......24

■La Toccata......30

■JPSJ Selected Papers in the Latest Issue......32

■PTEP Selected Papers in the Latest Issue......34

■Physics Community News......36

■Book Reviews......38