Kyusung Hwang

Condensed Matter Theorist

Associate Professor

Department of Applied Physics,
College of Applied Science,
Kyung Hee University

1732, Deogyeong-daero, Giheung-gu,

Yongin-si, Gyeonggi-do 17104, Korea

E-mail: kyusung.hwang@khu.ac.kr

Employment

Kyung Hee University (Mar. 2025 - present)
- Associate Professor
Korea Institute for Advanced Study (Apr. 2022–Feb. 2025)
- Assistant Professor (KIAS Fellow)
Korea Institute for Advanced Study (Sept. 2018–Mar. 2022)
- Postdoctoral Research Fellow (advisor: Prof. Kwon Park)
The Ohio State University (Oct. 2016–Jul. 2018)
- Postdoctoral Research Fellow (advisors: Prof. Nandini Trivedi and Prof. Mohit Randeria)

Education

University of Toronto (Jan. 2012–Sept. 2016)
- Ph.D. in Physics (advisor: Prof. Yong Baek Kim, thesis: "Novel Quantum Phases in Correlated Electron Systems")
Seoul National University (Sept. 2008–Aug. 2010)
- M.S. in Physics (advisors: Prof. Jaejun Yu and Prof. Kwon Park)
Yonsei University (Mar. 2001–Feb. 2008)
- B.S. in Physics (military service: Jun. 2003–Nov. 2005)

Workshop organizing

“Emergent Quantum Matter with Topology and Correlation” (KIAS, 2024/11/25-28)
- Co-organized by Gil Young Cho, SungBin Lee, Yong Baek Kim, and myself
“Correlation and Topology in Quantum Matter” (Seoul, 18-21 Dec. 2023)
- Co-organized by Dung Nguyen Xuan, Moon-Jip Park, Gil Young Cho, SungBin Lee, Yong Baek Kim, and myself
“Frontiers in Quantum Matter” (KIAS, 29-30 Sept. 2022)
- Co-organized by Moon-Jip Park, Gil Young Cho, Yong Baek Kim, and myself

Seminar hosting

KIAS Quantum Many-Body Seminar Series (Youtube channel)

Publication

1. Kyusung Hwang, “Mixed-State Quantum Spin Liquids and Dynamical Anyon Condensations in Kitaev Lindbladians”, Quantum 8, 1412 (2024).
2. Kyusung Hwang, “Vison condensation and spinon confinement in a kagome lattice Z2 spin liquid: A numerical study of a quantum dimer model”, Phys. Rev. B 110, 014426 (2024).
3. Pureum Noh, Kyusung Hwang, Eun-Gook Moon, “Manipulating Topological Quantum Phase Transitions of Kitaev’s Quantum Spin Liquids with Electric Fields”, Phys. Rev. B 109, L201105 (2024).
4. Kyusung Hwang, “Anyon condensation and confinement transition in a Kitaev spin liquid bilayer”, Phys. Rev. B 109, 134412 (2024).
5. Tuan Khanh Chau, Youngsu Choi, Kyusung Hwang, Gyoung Hoon Oh, Sophia Akhtar, Jeongyong Kim, Kwang- Yong Choi, Hyun-Yong Lee, Sung Ju Hong, and Dongseok Suh, “Electrical tracking of the Mott insulating Kitaev magnet using graphene/α-RuCl3 heterostructure”, Adv. Funct. Mater. 2024, 2306964.
6. 황규성, “키타예프 양자 스핀 액체”, KPS 물리학과 첨단기술, 2022년 9월 31권 9호.
7. O. Tanaka, Y. Mizukami, R. Harasawa, K. Hashimoto, K. Hwang, N. Kurita, H. Tanaka, S. Fujimoto, Y. Matsuda, E.- G. Moon, T. Shibauchi, “Thermodynamic evidence for a field-angle-dependent Majorana gap in a Kitaev spin liquid”, Nat. Phys. 18, 429 (2022).
8. Kyusung Hwang, Ara Go, Ji Heon Seong, Takasada Shibauchi, Eun-Gook Moon, “Identification of a Kitaev Quantum Spin Liquid by Magnetic Field Angle Dependence”, Nat. Commun. 13, 323 (2022).
9. Kyusung Hwang, Woo-Ram Lee, Kwon Park, “Electric Quantum Oscillation in Weyl Semimetals”, Phys. Rev. Research 3, 033132 (2021).
10. Kyusung Hwang, Nandini Trivedi, Mohit Randeria, “Topological Magnons with Nodal-Line and Triple-Point Degeneracies: Implications for Thermal Hall Effect in Pyrochlore Iridates”, Phys. Rev. Lett. 125, 047203 (2020).
11. Inhee Lee, Franz G. Utermohlen, Daniel Weber, Kyusung Hwang, Chi Zhang, Johan van Tol, Joshua E. Goldberger, Nandini Trivedi, P. Chris Hammel, “Fundamental Spin Interactions Underlying the Magnetic Anisotropy in the Kitaev Ferromagnet CrI3”, Phys. Rev. Lett. 124, 017201 (2020).
12. T. Nan, T.J. Anderson, J. Gibbons, K. Hwang, N. Campbell, H. Zhou, Y.Q. Dong, G.Y. Kim, D.F. Shao, T.R. Paudel, N. Reynolds, X.J. Wang, N.X. Sun, E.Y. Tsymbal, S.Y. Choi, M.S. Rzchowski, Y.B. Kim, D.C. Ralph, C.B. Eom, “Anisotropic spin-orbit torque generation in epitaxial SrIrO3 by symmetry design”, PNAS 116, 16186 (2019).
13. Adarsh S. Patri, Kyusung Hwang, Hyun-Woo Lee, Yong Baek Kim, “Theory of large intrinsic spin Hall effect in iridate semimetals”, Sci. Rep. 8, 8052 (2018).
14. Li Ern Chern, Kyusung Hwang, Tomonari Mizoguchi, Yejin Huh, Yong Baek Kim, “Quantum spin liquid and magnetic order in a two-dimensional nonsymmorphic lattice: Considering the distorted kagome lattice of volborthite”, Phys. Rev. B 96, 035118 (2017).
15. Robert Schaffer, Yejin Huh, Kyusung Hwang, Yong Baek Kim, “Quantum spin liquid in a breathing kagome lattice”, Phys. Rev. B 95, 054410 (2017).
16. Tomonari Mizoguchi, Kyusung Hwang, Eric Kin-Ho Lee, Yong Baek Kim, “Generic model for the hyperkagome iridate Na4Ir3O8 in the local-moment regime”, Phys. Rev. B 94, 064416 (2016).
17. Kyusung Hwang, Yong Baek Kim, “Theory of Multifarious Quantum Phases and Large Anomalous Hall Effect in Pyrochlore Iridate Thin Films”, Sci. Rep. 6, 30017 (2016).
18. Kyusung Hwang, Yong Baek Kim, “Theory of triplon dynamics in the quantum magnet BiCu2PO6”, Phys. Rev. B 93, 235130 (2016).
19. K. W. Plumb, Kyusung Hwang, Y. Qiu, Leland W. Harriger, G. E. Granroth, Alexander I. Kolesnikov, G. J. Shu, F. C. Chou, Ch. Ruegg, Yong Baek Kim, Young-June Kim, “Quasiparticle-continuum level repulsion in a quantum magnet”, Nat. Phys. 12, 224 (2016).
20. Kyusung Hwang, Yejin Huh, Yong Baek Kim, “Z2 gauge theory for valence bond solids on the kagome lattice”, Phys. Rev. B 92, 205131 (2015).
21. Kyusung Hwang, Subhro Bhattacharjee, Yong Baek Kim, “Signatures of spin-triplet excitations in optical conductivity of valence bond solids”, New J. Phys. 16, 123009 (2014).
22. SungBin Lee, Jae-Seung Jeong, Kyusung Hwang, Yong Baek Kim, “Emergent quantum phases in a frustrated J1-J2 Heisenberg model on the hyperhoneycomb lattice”, Phys. Rev. B 90, 134425 (2014).
23. Eric Kin-Ho Lee, Subhro Bhattacharjee, Kyusung Hwang, Heung-Sik Kim, Hosub Jin, Yong Baek Kim, “Topological and magnetic phases with strong spin-orbit coupling on the hyperhoneycomb lattice”, Phys. Rev. B 89, 205132 (2014).
24. Kyusung Hwang, Tyler Dodds, Subhro Bhattacharjee, Yong Baek Kim, “Three-dimensional nematic spin liquid in a stacked triangular lattice 6H-B structure”, Phys. Rev. B 87, 235103 (2013).
25. Kyusung Hwang, Kwon Park, Yong Baek Kim, “Influence of Dzyaloshinskii-Moriya interactions on magnetic structure of a spin-1/2 deformed kagome lattice antiferromagnet”, Phys. Rev. B 86, 214407 (2012).
26. Kyusung Hwang, Yong Baek Kim, Jaejun Yu, Kwon Park, “Spin cluster operator theory for the kagome lattice antiferromagnet”, Phys. Rev. B 84, 205133 (2011).

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