I am a theoretical/computational condensed matter physicist. I received my Ph. D in physics in 2011 in the University of Tokyo under supervision of Prof. Naoki Kawashima. Then, I became a postdoc in Los Alamos National Laboratory in 2011. After 3 years in the US, I moved back to Japan in 2014 and worked in RIKEN for my second postdoc, until I joined Shanghai Jiao Tong University (SJTU) in Dec. 2018 as a tenure-track associate professor.

Very broadly, I am interested in physics of so-called emergent states of matter in condensed matter systems. Examples of emergent states include quantum spin liquids, exotic magnetic order in frustrated spin systems, multiferroic states, and topological insulators and superconductors. Especially, exploring topological nature of excitations has been an interesting research direction to uncover new physics, such as spinons in quantum spin liquids and edge/surface states in topological matters.

Highlights of my research include a theory of magnetic vortex crystals in quantum magnets, a theory of novel multiferroics, a quantum Monte Carlo study of Z2 spin liquids, a theory of strongly-correlated magnons in a frustrated magnet, and so on (see the selected publication list for details). Quantum Monte Carlo methods are one of my specialties, while I also use analytical methods such as large-N and large-S expansions. In addition, I have collaborations with both theoretical and experimental researchers in University of Tennessee, Oak Ridge National Laboratory, Los Alamos National Laboratory, the University of Tokyo, and, last but not the least, SJTU.

In SJTU, Prof. Xiaoqun Wang, Prof. Mingpu Qin, Prof. Zi Cai, and myself form a loosely-connecting research group sharing the common interest of studying strongly correlated systems by using a variety of numerical methods.

Research Interests:

1.Quantum magnetism

2. Spin liquids

3. Multiferroics

4. Quantum Monte Carlo methods

Research Team:

1. NSFC【外青项目】11950410507, Fractionalized Spin Excitation in Frustrated Quantum Magnets Proximate to Spin Liquids (2020/01 – 2021/12), 主持. 

2. 科技部【国家重点研发计划】2016YFA0300500, 量子自旋阻挫体系和自旋液体中的新奇量子效应及调控研究 (2019/01 – 2021/12), 参与

3. NSFC【面上项目】12074246, 量子自旋液体中拓扑拟粒子的性质：量子蒙特卡罗和新的large-N理论 (2021/01 – 2024/12), 主持

4. NSFC【联合基金重点项目】U2032213, 二维三角晶格阻挫材料的量子磁性起源及强磁场调控研究 (2021/01 - 2024/12), 参与

1. Y.Kamiya, Magnetic field induced deformation of the spin density wave microphases in Ca₃Co₂O₆. Phys. Rev. B 107, 134409 (2023) 

2. Ivan Nekrashevich, Xiaxin Ding (*), Fedor Balakirev, Hee Taek Yi, Sang-Wook Cheong, Leonardo Civale, Yoshitomo Kamiya (#), and Vivien S. Zapf, Reaching the equilibrium state of the frustrated triangular Ising magnet Ca₃Co₂O₆. Phys. Rev. B 105, 024426 (2022) [Editors' Suggestion]
   

3. Ying Su, Akiko Masaki-Kato, Wei Zhu, Jian-Xin Zhu, Yoshitomo Kamiya (#), and Shizeng Lin (#), Stable Higgs mode in anisotropic quantum magnets. Phys. Rev. B 102, 125102 (2020) [Editors' Suggestion]

4. E. A. Ghioldi, M. G. Gonzalez, Shangshun Zhang, Y. Kamiya, L. O. Manuel, A. E. Trumper, and C. D. Batista, Dynamical structure factor of the triangular Heisenberg model: Schwinger boson theory beyond mean field. Phys. Rev. B 98, 184403 (2018)

5. Y. Kamiya, A. Furusaki, J. C. Y. Teo, and G.-W. Chern, Majorana Stripe Order on the Surface of Three-Dimensional Topological Insulator. Phys. Rev. B 98 (Rapid Commun.), 161409 (2018)

6. Y. Kamiya, L. Ge, Tao Hong, Y. Qiu, D. L. Quintero-Castro, H. B. Cao, M. Matsuda, E. S. Choi, C. D. Batista, M. Mourigal, H. D. Zhou, and J. Ma, The nature of spin excitation in the one-third magnetization plateau phase of Ba₃CoSb₂O₉. Nat. Commun. 9, 2666 (2018)

7. J. Ma, Y. Kamiya, Tao Hong, H. B. Cao, G. Ehlers, W. Tian, C. D. Batista, Z. L. Dun, H. D. Zhou, and M. Matsuda, Static and Dynamical Properties of the Spin-1/2 Equilateral Triangular-Lattice Antiferromagnet Ba₃CoSb₂O₉. Phys. Rev. Lett. 116, 087201 (2016)

8. Yoshitomo Kamiya, Yasuyuki Kato, Joji Nasu, and Yukitoshi Motome, Magnetic three states of matter: A quantum Monte Carlo study of spin liquids. Phys. Rev. B 92 (Rapid Commun.), 100403 (2015)

9. Shi-Zeng Lin, Yoshitomo Kamiya (#), Gia-Wei Chern, and Cristian D. Batista, Stiffness from Disorder in Triangular-Lattice Ising Thin Films. Phys. Rev. Lett. 112, 155702 (2014)

10. Y. Kamiya and C. D. Batista, Magnetic vortex crystals in frustrated Mott insulator. Phys. Rev. X 4, 011023 (2014)

11. Y. Kamiya and C. D. Batista, Formation of Magnetic Microphases in Ca₃Co₂O₆. Phys. Rev. Lett. 109, 067204 (2012)

12. Y. Kamiya and C. D. Batista, Multiferroic Behavior in Trimerized Mott Insulators. Phys. Rev. Lett. 108, 097202 (2012)

13. Y. Kamiya, N. Kawashima, and C. D. Batista, Dimensional crossover in the quasi-two-dimensional Ising-O(3) model. Phys. Rev. B 84, 214429 (2011)

博士后招聘:

The School of Physics and Astronomy in Shanghai Jiao Tong University (SJTU) invites applications for a 2-year (possible extension by 1 year) Postdoctoral Fellow in Prof. Kamiya’s group (https://www.physics.sjtu.edu.cn/kamiya). The annual salary will be determined based on expertise and past academic achievement of the successful candidate and is no less than 250,000 RMB (before tax reduction). The successful candidate will primarily collaborate with Prof. Kamiya on various topics of theoretical/computational condensed matter physics, such as (but not limited to) frustrated quantum spin systems, multiferroics, development of novel quantum Monte Carlo and other numerical algorithms, and so on.

To apply for this position, please send the following materials by email (see above for the contact information):

1. Cover Letter

2. Curriculum Vitae (with Publication List included)

3. Research statement (2 pages max.)

4. Contact information of 2 researchers who can send reference letters upon request