Metallurgical Abstracts on Light Metals and Alloys vol. 58
Three-dimensional bonding anisotropy of bulk hexagonal metal titanium demonstrated by high harmonic generation
Ikufumi Katayama*,**, Kento Uchida***, Kimika Takashina*, Akari Kishioka*, Misa Kaiho*, Satoshi Kusaba*, Ryo Tamaki*, Ken-ichi Shudo*,
Masahiro Kitajima*,****, Ngo Duc Thien*****, Tadaaki Nagao*****,******, Jun Takeda*,**, Koichiro Tanaka*** and Tetsuya Matsunaga*******
* Department of Physics, Graduate School of Engineering Science, Yokohama National University, 79-5 Tokiwadai, Hodogaya, Yokohama 240-8501, Japan
** Semiconductor and Quantum Integrated Electronics Research Center (SQIE), Institute for Multidisciplinary Sciences, Yokohama National University, 79-5 Tokiwadai, Hodogaya, Yokohama 240-8501, Japan
*** Department of Physics, Graduate School of Science, Kyoto University, Kitashirakawa-Oiwakecho, Sakyo, Kyoto 606-8501, Japan
**** LxRay Co. Ltd., 3-28-22 Koshienguchi, Nishinomiya, Hyogo 663-8113, Japan
***** Research Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
****** Department of Condensed Matter Physics, Hokkaido University, Kita 10, Nishi 8, Kita-ku, Sapporo, Hokkaido 060-0810 Japan
******* Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Sagamihara, Kanagawa 252-5210, Japan
[Published in communications physics, Vol. 7 (2024), 404]
https://doi.org/10.1038/s42005-024-01906-0
E-mail: matsunaga.tetsuya[at]jaxa.jp
Key Words: Band structure, Metallic material, Ultrafast pulse laser, Mid-infrared pulse, Spectroscopy
High harmonic generation (HHG) in solid-state materials is an emerging field of photonics research that can unveil the detailed electronic structure of materials, bond strengths and scattering processes of electrons. Although HHG in semiconducting and insulating materials has been intensively investigated both experimentally and theoretically, metals have rarely been explored because the strong screening effect of high-density free electrons is considered to significantly weaken the HHG signal. Here, we investigated HHG upon infrared excitation in bulk hexagonal metal titanium (Ti), a typical building block for practical lightweight structural materials. By analyzing the polarization dependence, the approach revealed the three-dimensional (3D) anisotropy in the electronic states. The results demonstrated the potential of HHG spectroscopy for characterizing 3D bonding anisotropy in metallic systems that are of fundamental importance for designing lightweight and strong structural materials.