Suguru Yoshida

Thank you for stopping by my personal website 👋 I am a researcher working at the border of chemistry and physics, with an interest in how the crystal structure gives rise to their diverse and sometimes surprising properties. Using both experimental and theoretical tools, I seek to uncover simple rules behind crystalline solids and to contribute to the quest for new functional materials.

Beyond the details of a project, I’m especially attracted to research that reflects your personality. I am convinced that scientific advancement is fostered when, in addition to curiosity and creativity, the unique contributions of each researcher are fully embraced.

news

Jan 26, 2026	New paper regarding the ferroelectricity of a defect perovskite is now published in JACS.
Nov 03, 2025	A new arXiv preprint posted.
Oct 14, 2025	A new paper published in Crystal Growth & Design.

latest posts

Jul 13, 2025	Let's visualize Brillouin zone with VESTA
Jun 20, 2025	Interaxion Podcast Episode 62: Altermagnet
Apr 10, 2024	Interaxion Podcast Episode 60: Welcome to the Physics World

selected publications

JACS
Switchable Polarization in an A-Site Deficient Perovskite through Vacancy and Cation Engineering

Suguru Yoshida, Olivier Hernandez, Jinsuke Miyake, Kei Nakayama, Ryo Ishikawa, Hajime Hojo, Yuichi Ikuhara, Venkatraman Gopalan, Katsuhisa Tanaka, and Koji Fujita

J. Am. Chem. Soc., 148 , 4557–4567 (2026).

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Defects are often considered detrimental to crystalline materials, yet they can also be a powerful source of functionality when properly used. We demonstrate that the A-site-deficient perovskite Y_1/3TaO₃ exhibits a switchable polarization enabled by ordered vacancies coupled with TaO₆ octahedral rotations. By favoring rotational over off-centering instabilities, this system avoids centrosymmetric incommensurate states common to defect-ordered perovskites. Unlike canonical improper ferroelectrics, vanishing dipoles on vacancy layers allow a net ferroelectric alignment, enhancing polarization. Superspace analysis and lattice-dynamics calculations further reveal that epitaxial strain offers a route to amplify polarization. This defect-ordering strategy provides a general pathway to boost polarization in improper ferroelectrics.
@article{Yoshida2026, title = {Switchable Polarization in an A-Site Deficient Perovskite through Vacancy and Cation Engineering}, author = {Yoshida, Suguru and Hernandez, Olivier and Miyake, Jinsuke and Nakayama, Kei and Ishikawa, Ryo and Hojo, Hajime and Ikuhara, Yuichi and Gopalan, Venkatraman and Tanaka, Katsuhisa and Fujita, Koji}, year = {2026}, journal = {J. Am. Chem. Soc.}, volume = {148}, number = {4}, pages = {4557--4567}, doi = {10.1021/jacs.5c19790} }
Nat. Commun.
High-entropy engineering of the crystal and electronic structures in a Dirac material

Antu Laha, Suguru Yoshida, Francisco Santos Vieira, Hemian Yi, Seng Huat Lee, Sai Venkata Gayathri Ayyagari, Yingdong Guan, Lujin Min, Jose Gonzalez Jimenez, Leixin Miao, David Graf, Saugata Sarker, Weiwei Xie, Nasim Alem, Venkatraman Gopalan, Cui-Zu Chang, Ismaila Dabo, and Zhiqiang Mao

Nat. Commun., 15 , 3532 (2024).

Abs DOI Bib

A high-entropy strategy is used to engineer Dirac electronic states in topological materials. By mixing Ba, Sr, Ca, Eu, and Yb at the A site of AMnSb₂, a new compound (Ba_0.38Sr_0.14Ca_0.16Eu_0.16Yb_0.16)MnSb₂ is synthesized with a polar structure absent in the parent phases. Despite lattice disorder, the high-entropy crystal retains linear band dispersion. Local distortions transform the original 2D Dirac states into anisotropic quasi-3D ones, as shown by quantum oscillation measurements. This work highlights high-entropy design as a promising route to tune structure and electronic properties in Dirac semimetals.
@article{Laha2024NC, title = {High-entropy engineering of the crystal and electronic structures in a Dirac material}, author = {Laha, Antu and Yoshida, Suguru and Marques dos Santos Vieira, Francisco and Yi, Hemian and Lee, Seng Huat and Ayyagari, Sai Venkata Gayathri and Guan, Yingdong and Min, Lujin and Gonzalez Jimenez, Jose and Miao, Leixin and Graf, David and Sarker, Saugata and Xie, Weiwei and Alem, Nasim and Gopalan, Venkatraman and Chang, Cui-Zu and Dabo, Ismaila and Mao, Zhiqiang}, journal = {Nat. Commun.}, publisher = {Nature Publishing Group}, volume = {15}, number = {1}, pages = {3532}, month = apr, year = {2024}, language = {en}, doi = {10.1038/s41467-024-47781-9} }
PRL
Electronic Origin of Non-Zone-Center Phonon Condensation: Octahedral Rotation as a Case Study

Suguru Yoshida, Hirofumi Akamatsu, and Katsuro Hayashi

Phys. Rev. Lett., 127 , 215701 (2021).

Abs DOI arXiv Bib

Zone-boundary phonon modes drive structural distortions linked to functional properties, but their quantum-mechanical origin has remained unclear. This study proposes that bonding interactions between Bloch states at different wave vectors cause these instabilities via the second-order Jahn–Teller effect. First-principles calculations and group-theoretical analysis demonstrate that classic octahedral rotations result from this mechanism. The proposed framework applies broadly to non-zone-center phonon condensations and offers a unified perspective on structural phase transitions in crystalline materials.
@article{Yoshida2021PRL, title = {Electronic Origin of Non-Zone-Center Phonon Condensation: Octahedral Rotation as a Case Study}, author = {Yoshida, Suguru and Akamatsu, Hirofumi and Hayashi, Katsuro}, journal = {Phys. Rev. Lett.}, volume = {127}, number = {21}, pages = {215701}, month = nov, year = {2021}, language = {en}, doi = {10.1103/PhysRevLett.127.215701}, }