Introduction

My name is Sopheak Sorn from Cambodia. I am a theoretical condensed matter postdoc at Karlsruhe Institute of Technology, Germany.

My research focuses on the rich properties of magnetic systems featuring nontrivial topology in real space and reciprocal space, such as topological spin textures and topological band structure. Topics of my interest include:

Dynamics of magnetic solitons such as skyrmions and hopfions
Emergent phenomena due to topological spin textures
Transports and topological properties of unconventional magnets
Linear and nonlinear responses.

Education

2021 - Present : Postdoc at Karlsruhe Institute of Technology, Germany. PI: Markus Garst

2016 - 2021 : PhD, theoretical condensed matter physics, University of Toronto, Canada. Supervisor: Arun Paramekanti. Thesis: "Topology and Magnetism in Quantum Materials."; available on the university's website.

2015 - 2016 : MSc in Physics, Perimeter Institute for Theoretical Physics & University of Waterloo, Canada.

Supervisor: Yong-Baek Kim. "Projective Symmetry Analysis of Spin Liquid Phases in Anisotropic Kagome Volborthites"

2011 - 2015 : BSc in Physics and Mathematics, Hong Kong University of Science and Technology.

News

23.05.2025: our manuscript on "activation of anomalous Hall effect and orbital magnetization by domain walls in altermagnets" is now available on arXiv.

31.03.2025: our manuscript on "Anti-chiral surface states in rutile altermagnets" is accepted for a publication as a Letter in Phys. Rev. B.

Preprints

[1] Sopheak Sorn, Yuriy Mokrousov,

"Activation of anomalous Hall effect and orbital magnetization by domain walls in altermagnets"

arXiv:2505.15894 (2025). URL

[2] Sopheak Sorn, Joerg Schmalian, Markus Garst,

"Topological dipole of quantum skyrmions"

arXiv:2412.16284 (2024). URL

List of Publications

[10] Sopheak Sorn,

"Antichiral surface states and Su Schrieffer Heeger physics in rutile altermagnets",

Phys. Rev. B 111, L161109 (2025)

[9] Sopheak Sorn, Adarsh S. Patri,

Editors' Suggestion "Signature of hidden octupolar orders from nonlinear Hall effects",

Phys. Rev. B 110, 125127 (2024)

[8] M.M. Piva, J.C. Souza, V. Brousseau-Courure, Sopheak Sorn, et al,

"Topological features in the ferromagnetic Weyl semimetal CeAlSi: Role of domain walls ",

Phys. Rev. Research 5, 013068 (2023)

[7] Sopheak Sorn, Luyi Yang, Arun Paramekanti,

"Resonant optical topological Hall conductivity from skyrmions",

Phys. Rev. B 104, 134419 (2021)

[6] Finn L. Buessen, Sopheak Sorn, Ivar Martin, Arun Paramekanti,

"Nematic order driven by superconducting correlations"

Annals of Physics, 435, 168494 (2021)

[5] Sopheak Sorn, Arun Paramekanti

"Domain wall skew scattering in ferromagnetic Weyl metals"

Phys. Rev. B 103, 104413 (2021)

[4] F. Michael Bartram, Sopheak Sorn, et al

"Anomalous Kerr effect in SrRuO3 thin films"

Phys. Rev. B 102, 140408 (R) (2020)

[3] Sopheak Sorn, Stefan Divic, Arun Paramekanti

"Tunable skyrmion crystals and topological quantum oscillations in magnetic metals"

Phys. Rev. B 100, 174411 (2019)

[2] Sopheak Sorn

"Bilayer Haldane model: from trivial band insulator to fractionalized quantum anomalous Hall insulator"

Phys. Rev. B 98, 125145 (2018)

[1] Li Ern Chern, Robert Schaffer, Sopheak Sorn, Yong Baek Kim

"Fermionic spin liquid analysis of the paramagnetic state in volborthite"

Phys. Rev. B 96, 165117 (2017)

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