Subhaskar Mandal
Assistant Professor
Photograph: 
Phone: 
+91 22-25767586
Phone No Extn: 
7586
Email: 
subhaskar@iitb.ac.in
Related Links: 
Group website
Office: 

329 B

Research Interests: 
Our research focuses on exploring novel physical phenomena in topological photonics, exciton–polaritons, and topological lasers. We aim to design and understand systems that exhibit unique properties arising from topology and quantum effects, with the goal of advancing both fundamental science and practical applications in photonics.
 
Key areas of interest include:
 
  • Topological Photonics
  • Exciton-Polaritons
  • Topological Lasers
  • Nonlinear Optics
  • Light-Matter interaction
  • Non-Hermitian Physics
Our work combines theoretical exploration with cutting-edge applications, such as developing low-threshold topological lasers and innovative platforms for light–matter interactions. To bridge the gap between theory and experiment, we actively collaborate with experimentalists at IIT Bombay, other leading institutes in India, and international institutions. These collaborations are central to validating and implementing our theoretical concepts, driving both groundbreaking discoveries and the development of advanced photonic technologies.
 
For more details, please visit the group website.
 
 
PhD Openings (Updated August 2025): 
 
We are always looking for motivated PhD students to work on the topics outlined above. Research directions are flexible and can be tailored to individual interests. Interested candidates are encouraged to contact me via email. IITB EP and MSc students are also welcome to reach out directly or drop by for a discussion.



Postdoc Openings (Updated August 2025): 

We don’t have open postdoc positions right now, but if you think your research interests align with ours, feel free to get in touch by email — we’re always happy to discuss possible opportunities.
 
 
Women scientists are also encouraged to apply through the WISE Post-Doctoral Fellowship program. For details, please visit: https://online-wosa.gov.in/wosa/aboutUsPDF
 
Selected Publications: 

       Please check my Google Scholar page for the full list of publications: click here   

 

       (Updated January 2025)

 

  1. G. G. Liu, S. Mandal, X. Xi, Q. Wang, C. Devescovi, A. Morales-Pérez, Z. Wang, L. Yang, R. Banerjee, Y. Long, Y. Meng, P. Zhou, Z. Gao, Y. Chong, A. García-Etxarri, M. G. Vergniory, and B. Zhang, “Photonic Axion Insulator”, Science 387, 162-166 (2025).
  2. R. Banerjee, S. Mandal, Y. Y. Terh, S. Lin, G. G. Liu, B. Zhang, and Y. D. Chong, “Topological disclination states and charge fractionalization in a non-Hermitian lattice”, Phys. Rev. Lett. 133, 233804 (2024). 
  3. F. Jin, S. Mandal, Z. Zhang, J. Wu, W. Wen, J. Ren, B. Zhang, T. C. H. Liew, Q. Xiong, and R. Su, “Observation of perovskite topological valley exciton-polaritons at room temperature”, Nature Communications 15, 10563 (2024). 
  4. G. G. Liu, S. Mandal, P. Zhou, X. Xi, R. Banerjee, Y. H. Hu, M. Wei, M. Wang, Q. Wang, Z. Gao, H. Chen, Y. Yang, Y. Chong, and B. Zhang, “Localization of chiral edge states by the non-Hermitian skin effect”, Phys. Rev. Lett. 132, 113802 (2024).
  5. J. Wu, S. Ghosh, Y. Gan, Y. Shi, S. Mandal, H. Sun, B. Zhang, T. C. H. Liew, R. Su, and Q. Xiong, “Higher-order topological polariton corner state lasing”, Science Advances 9, 21, eadg4322 (2023). 
  6. X. Xi, B. Yan, L. Yang, Y. Meng, Z. X. Zhu, J. M. Chen, Z. Wang, P. Zhou, P. P. Shum, Y. Yang, H. Chen, S. Mandal, G. G. Liu, B. Zhang, and Z. Gao, “Topological antichiral surface states in a magnetic Weyl photonic crystal”, Nature Communications 14, 1991 (2023). 
  7. S. Mandal, G. G. Liu, and B. Zhang, “Topology with Memory in Nonlinear Driven-Dissipative Photonic Lattices”, ACS Photonics 10, 1, 147–154 (2023). 
  8. S. Mandal, R. Banerjee, and T. C. H. Liew, “From the Topological Spin-Hall Effect to the Non-Hermitian Skin Effect in an Elliptical Micropillar Chain”, ACS Photonics 9, 2, 527–539 (2022).
  9. R. Banerjee, S. Mandal, and T. C. H. Liew,  “Coupling between exciton-polariton corner modes through edge states”, Phys. Rev. Lett. 124, 063901 (2020). 
  10. S. Mandal, R. Banerjee, and T. C. H. Liew,  “Nonreciprocal Transport of Exciton Polaritons in a Non-Hermitian Chain”, Phys. Rev. Lett. 125, 123902 (2020). 
Research Category: 
Optics and Photonics