Department of Physics

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Adam B. Cahaya, Dr.

Adam B. Cahaya, Dr.

Dr. Adam Badra Cahaya is an Associate Professor in condensed-matter physics and a member of the Quantum, Magnetic, and Ionic Physics Research Group. His research focuses on the interplay between fundamental quantum phenomena and practical material applications, particularly in systems where spin, charge, and energy transport are strongly coupled.

He develops analytical and computational approaches to understand quantum dynamics, many-body interactions, and electronic structure in materials. His work has contributed to areas such as spin transport, magnetic interfaces, and thermoelectric energy conversion, with relevance to emerging technologies including spintronic devices and quantum energy systems.

He conducts his research within the framework of Applications and Basics of Condensed-matter (ABC) Physics, which emphasizes a “from fundamentals to functionality” perspective—connecting microscopic physical principles to the design of materials and devices with targeted properties.

Dr. Adam Badra Cahaya received his B.Sc., M.Sc., and Dr. Sc. degrees in 2013, 2015, and 2018, respectively, from the Department of Physics, Tohoku University. His doctoral dissertation, “Spin, Charge, and Heat Coupling at Magnetic Interfaces,” was completed within the Interdepartmental Doctoral Degree Program for Multi-Dimensional Material Science Leaders, a joint interdisciplinary program between the Department of Materials Science and Engineering (Faculty of Engineering) and the Department of Physics (Faculty of Science) at Tohoku University.

He conducted his doctoral research in the Theoretical Physics Group at the Institute for Materials Research under the JSPS Research Fellowship for Young Scientists.

His academic lineage is documented in international genealogy databases widely used in mathematics and theoretical physics:

He has received several recognitions, including the Satyalancana Wira Karya (2008) from the President of the Republic of Indonesia and the Young Scientist Award (2012) from the Aoba Society for the Promotion of Science.

Dr. Cahaya received multiple international distinctions in physics competitions, including a Silver Medal at the International Physics Olympiad (IPhO) 2008 and Gold Medals at the Asian Physics Olympiad (APhO) 2008 and the International Zhautykov Olympiad in Physics 2008, as well as a Bronze Medal at APhO 2007.

He continues to contribute to physics education by serving as a mentor and trainer for the Indonesian team in the International Physics Olympiad (IPhO), supporting the development of advanced problem-solving and theoretical physics skills among students.

Dr. Cahaya received several international distinctions in physics competitions, including a Silver Medal at the International Physics Olympiad (2008), Gold Medals at the Asian Physics Olympiad (2008) and the International Zhautykov Olympiad (2008), and a Bronze Medal at APhO (2007). In recognition of these achievements, he was awarded the Satyalancana Wira Karya by the President of the Republic of Indonesia in 2008.

He pursued his academic training in physics under highly competitive international funding schemes. He was awarded the MEXT Scholarship (2008–2013) for his undergraduate studies, during which he also received the Young Scientist Award from the Aoba Society for the Promotion of Science (青葉理学振興会奨励賞 2012). The MEXT scholarship was subsequently extended to support his M.Sc. studies (2013–2015).

For his doctoral research (2015–2018), he was supported by the Japan Society for the Promotion of Science Research Fellowship for Young Scientists, enabling advanced research in condensed-matter physics and collaboration with leading international institutions.

He continues to contribute to physics education by serving as a mentor and trainer for the Indonesian team in the International Physics Olympiad, supporting the development of advanced problem-solving and theoretical physics skills among students.

His research has been supported by internal funding from Universitas Indonesia and FMIPA UI, as well as external grants from international agencies including JSPS, the Indonesia Endowment Fund for Education (LPDP), and the Indonesia Toray Science Foundation.

These projects bridge fundamental theory and practical applications, particularly in spintronics, magnetic materials, and energy conversion systems.

YearFunderResearch Title
2025-2026UIStability Study of Quantum Dot Nanostructures
2025-2026UIEnvironmentally Friendly Transition Metal-Based Perovskites for Solar Energy and Medical Scintillation Applications
2024-2025UITheoretical Study of Multiferroic Properties in Magnetic Heterostructures for Energy-Efficient Memory Devices
2024-2025UIApplication of Antisymmetric Exchange Effects on Magnetic Textures at Heavy Metal Interfaces
2024-2025UITheoretical Study of Non-Centrosymmetric Structural Effects on Magnetoelectric Properties of Multiferroic Materials
2023-2024FMIPASpin–Orbit Coupling in Multiferroic Devices for Energy Efficiency
2023-2024UITheoretical Study of Antisymmetric Exchange at Heavy Metal Interfaces
2023-2024LPDPTheoretical Study of Electrical Generation in Advanced Functional Materials Using Rare-Earth Elements
2023ITSFModeling of Electrical Control of Exchange Bias for Efficient Magnetic Recording
2022-2023UITheoretical Modeling of Current Generation via Nuclear Spin
2022-2023UITheoretical Modeling of Electrical Current Generation Mechanisms via Rare-Earth Impurities
2022-2023UITheoretical Modeling of Magnetization Control Mechanisms via Interfacial Spin–Orbit Interaction
2020-2021UITheoretical Modeling of Electronic Band Structures in Semiconductors for Energy Conversion Applications
2020-2021UITheoretical Modeling of Nuclear Magnetic Resonance in Heavy Metals
2020-2021UITheoretical Modeling of Spin Transfer Torque Effects in Heavy Metals
2020-2021UITheoretical Study of Surface Impurity Effects on Magnetic Properties of Heavy Metals
2020-2021FMIPATheoretical Study of Spin Energy Transfer in Nuclear Spin-Based Batteries
2015-2018JSPSAntiferromagnetic Spin Seebeck Effect
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Research interest

Dr. Adam Badra Cahaya’s research bridges fundamental understanding and practical implementation in condensed-matter systems. His work encompasses quantum dynamics, many-body interactions, and electronic structure modeling, with applications in spin transport, magnetic interfaces, and energy conversion technologies.

His approach is grounded in Analytical Dynamics of Atoms in Materials (ADAM), which emphasizes analytical and computational methods to link microscopic physical mechanisms with the design of functional materials and device technologies. This framework enables a systematic “from theory to application” pathway, connecting quantum-level insights to experimentally relevant phenomena.

Highlights

  • Spin-based formulation of electromagnetic momentum and light–matter interactions. (Coverage by phys.org)
  • Analytical modeling of spin transport and angular momentum transfer at magnetic interfaces (Coverage by phys.org)
  • Design principles for thermoelectric and quantum energy conversion materials

Prospective students and collaborators interested in Applications and Basics of Condensed-matter (ABC) Physics are welcome to get in touch.

Basics (Fundamental Physics)
Applications (Applied Physics)
Selected Publications
Google Scholar
Scopus
  1. A.B. Cahaya, Zitterbewegung, momentum, and spin dynamics of electromagnetic waves in a linear dielectric medium, Phys. Rev. A  112, 033721 (2025).
  2. A.B. Cahaya, Spin current compensation from competing magnon modes in ferrimagnets, J. Phys. D: Appl. Phys. 58, 345002 (2025).
  3. S. Aji, M. A. N. Azhiim, N. I. P. Ayu, A. B. Cahaya, K. Kusakabe, M. A. Majidi, Spin current generation driven by skyrmion dynamics under magnetic anisotropy and polarized microwaves, J. Phys. D: Appl. Phys. 58, 315003 (2025).
  4. F.E.M. Rahangiar, A.B. Cahaya, M.S. Muntini, I. Anshori, and E.H. Hasdeo, “Optimal half-metal band structure for large thermoelectric performance”, Phys. Rev. B 110, 035150 (2024)
  5. M.P.M. Akhir, E. Suprayoga, and A.B. Cahaya, “Stabilization and Helicity Control of Magnetic Skyrmion”, J.Phys. D: Appl. Phys. 57, 165303 (2024)
  6. A.B. Cahaya, A.O. Leon, and M.H. Fauzi, “Spin-orbit torque on nuclear spins exerted by a spin accumulation via hyperfine interactions”, Nanotechnology 34, 505001 (2023)
  7. A.B. Cahaya, A.A. Anderson, A. Azhar, and M.A. Majidi,”Electrically controllable exchange bias via interface magnetoelectric effect”, IEEE Trans. Magn. 59 (11) 1300304 (2023)
  8. M.S. Ukhtary, A.R.T. Nugraha, A.B. Cahaya, A. Rusydi, and M.A. Majidi, “High-performance Kerr quantum battery”, Appl. Phys. Lett. 123, 034001 (2023)
  9. A.B. Cahaya and A.O. Leon, “Dzyaloshinskii-Moriya spin density by skew scattering”, Phys. Rev. B 106, L100408 (2022)
  10. A.B. Cahaya, R.M. Sitorus, A. Azhar, A.R.T. Nugraha, and M.A. Majidi, “Enhancement of spin-mixing conductance by s-d orbital hybridization in heavy metals”, Phys. Rev. B 105, 211438 (2022)
  11. A.B. Cahaya, “Enhancement of thermal spin pumping by orbital angular momentum of rare earth iron garnet”, J. Magn. Magn. Mater. 553, 169248 (2022) 
  12. M.S. Muntini, E. Suprayoga, S.A. Wella, I. Fatimah, L. Yuwana, T. Seetawan, A.B. Cahaya, A.R.T. Nugraha and E.H. Hasdeo, “Spin-tunable thermoelectric performance in monolayer chromium pnictides”, Phys. Rev. Mater. 6, 064010 (2022)
  13. A.B. Cahaya, A. Azhar, D. Djuhana and M.A. Majidi, “Effect of interfacial spin mixing conductance on gyromagnetic ratio of Gd substituted Y3Fe5O12“, Phys. Lett. A 437, 128085 (2022)
  14. A.B. Cahaya, “Adiabatic limit of RKKY range function in one dimension”, J. Magn. Magn. Mater. 547, 168874 (2022).
  15. A.B. Cahaya and M.A. Majidi, “Effects of screened Coulomb interaction on spin transfer torque”, Phys. Rev. B 103, 094420 (2021)
  16. A.B. Cahaya, A.O. Leon, M.R. Aliabad and G.E.W. Bauer, “Equilibrium current vortices in simple metals doped with rare earths”, Phys. Rev. B 103, 064433 (2021)
  17. A.B. Cahaya, A. Azhar and M.A. Majidi, “Yukawa potential for realistic prediction of Hubbard and Hund interaction parameters for transition metals”, Phys. B Condens. Matter 604, 412696 (2021)
  18. A.O. Leon, J.D.E. Castro, J.C. Retamal, A.B. Cahaya and D. Altbir, “Manipulation of the RKKY exchange by voltages”, Phys. Rev. B 100, 014403 (2019)
  19. C.N. Rangkuti, A.B. Cahaya, A. Azhar, M.A. Majidi and A. Rusydi, “Manifestation of charge/orbital order and charge transfer in temperature-dependent optical conductivity of single-layered Pr0.5Ca1.5MnO4”, J. Phys. Condens. Matter 31, 365601 (2019)
  20. A.O. Leon, A.B. Cahaya and G.E.W. Bauer, “Voltage control of rare-earth magnetic moments at the magnetic-insulatorーmetal interface”, Phys. Rev. Lett. 120, 027201 (2018)
  21. A.B. Cahaya, A.O. Leon and G.E.W. Bauer, “Crystal field effects on spin pumping”, Phys. Rev. B 96, 144434 (2017)
  22. A.B. Cahaya, O.A. Tretiakov and G.E.W. Bauer, “Spin Seebeck power conversion”, IEEE Trans. Magn. 51, 0800414 (2015)
  23. A.B. Cahaya, O.A. Tretiakov and G.E.W. Bauer, “Spin Seebeck power generators”, Appl. Phys. Lett. 104, 042402 (2014)
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