Talks/Colloquia/Keynote Talks

International Meetings 

1. Invited Talk: “High-Order van Hove Singularities as a Route to Emergent Quantum States” at AAPLI-PSIK, International Conference on Density Functional Theory and Applications, IISER Pune, 19-21 May 2025

2. Invited Talk: “Quantum spin Hall effect in puckered lattices and tailored bottom-up materials” at Trilateral Conference on Advances in Materials Research (TCAMS) 2025, NTU Singapore (by MRS Singapore), 24-27 March 2025

3. Keynote Lecture: “Strategies for realizing double quantum spin Hall effect” at International School and Conference on Evolution of Electronic Structure Theory & Experimental Realization (EESTER) 2025, IIT Madras, India, 08-11 January 2025

4. Invited Talk: “Spin U(1) quasi-symmetry in materials with a quantized spin Hall effect” at International Conference on Electronic Structure Theory of Emergent Spin-Orbit Driven Phenomenon (ESTESODP), Department of Metallurgical Engineering and Materials Science, IIT Bombay, India, 11-15 November 2024

5. Keynote Lecture: “Topological Flatland: From obstructed atomic insulators to quantum spin Hall insulator” at International Conference on Advanced Nanomaterials for Sustainability (ICANS) 2024, AJCEA Kerala, India, 17-19 October 2024

6.  Invited Talk: “Atomically thin obstructed atomic insulators in puckered lattice materials” at International Conference on 60 Years of DFT: Advancements in Theory and Computation, IIT Mandi, India, 21-26 July 2024

7. Department Seminar: “New strategies for designing quantum matter with enhanced Berry curvature effects” at Institute of Physics, Academia Sinica, Taipei, Taiwan, 15 May 2024

8. Department Seminar: “Materials design of enhanced Berry curvature effects” at Department of Mechanical Engineering, University of Rochester, New York, USA, 19 March 2024

9. Invited Talk: “Designing topological materials with tunable nontrivial states and large Berry curvature effects” at APS March Meeting 2024, Minneapolis, Minnesota, USA, 04-08 March 2024

10. Invited Talk: “Mapping between symmetry, property, and topology in materials” at International conference on emerging phenomena in quantum materials, Bharatpur, India [by Uppsala University, Sweden & SPPU Pune], 11-15 December 2023

11. Invited Talk: “Local structural motifs driven topological electronic states in quantum materials” at New Approaches and Machine Learning Methods for Ab initio calculations: NAMMA Psi-k Workshop, IISc & JNCASR, Bangalore, 24-28 July 2023

12. Invited Talk: “Designing atomically thin materials with switchable electronic and topological states” at Emergent phenomena in van der Waals Heterostructures, TIFR Mumbai, India, 09-12 January 2023

13. Invited Talk: “Superconductivity in chiral multifold fermion metal RhGe” at Spectroscopies of Novel Superconductors (SNS) 2022, Indian Institute of Science, Bangalore, India, 12-16 December 2022

14. Invited Talk: “Tunable Dirac and Weyl fermion states in SrIn2As2 class of Zintl materials”  at Invitation for International Conference on the Topology in Condensed Matter Systems (ICTCMS) 2022, S. N. Bose National Centre for Basic Sciences, Kolkata, India, 21-23 February 2022

15. Invited Talk: “Dirac, Weyl, and higher-fold fermions in topological quantum materials” at International Conference on Material Sciences and Applied Physics (ICMSAP) 2021, Pachhunga College Mizoram University, India, 22-24 November, 2021

16.  Invited Talk: “Materials Discovery for Realizing Chiral Majorana as Qubit” at QIS Team Meeting, Northeastern University Boston, USA, June 2020

17. Department Seminar: “Exotic saddle-like topological surface states in ZrPtGe materials family” at Institute of Physics, Academia Sinica, Taipei, Taiwan, June 2018

18. Invited Talk: “Topological semimetals prediction using first-principles calculations” at the 16th Workshop on First-Principles Computational Materials Physics, National Center for Theoretical Sciences (NCTS), Hsinchu, Taiwan, June 2018

19. Department Seminar: “Theoretical modelling of 2D materials and topological insulators” at ICL2DMOST, College of Optoelectronic Engineering, Shenzhen University, China, January 2018

20. Invited Talk: “Topological insulator and quantum spin Hall state in TlBiSe2 class of ternary semiconductors” at EMN Meeting on Quantum, Phuket, Thailand, April 2016

National Meetings

21. Invited Talk: “Symmetry-property-topology relationships in topological materials” at TIFR Annual Condensed Matter Meet, TIFR Mumbai, 17-19 February 2025

22. Invited Talk: “Spin U(1) quasi-symmetry in materials with a quantized spin Hall effect in puckered lattice materials” at Annual Conference on Quantum Condensed Matter (QMAT) 2024, IIT Guwahati, India, 20-23 December 2024

23. Invited Talk: “Fate of quantum spin Hall effect under spin U(1) quasi-symmetries” at Young Investigators Meet on Quantum Condensed Matter Theory (YIMQCMT) 2024,  IISER Pune, India, 16-18 December 2024

24. Physics Colloquium: “Understanding-driven discovery of quantum matter: A bottom-up design approach” at Department of Physics, IISER Bhopal, India, 09 December 2024

25. Invited Talk: “Obstructed Atomic Insulators: From concept to material realizations” at National Conference on Electronic Structure (NCES) 2024, SRM-AP, India, 21-23 November 2024

26. Physics Colloquium: “Understanding-driven discovery of quantum matter: A bottom-up design approach” at Department of Physics, IIT Kanpur, India, 06 September 2024

27. Invited Talk: “Nature of nodal fermion states in anisotropic lattice materials” at TIFR Condensed-Matter Physics Conference, TIFR Hyderabad, 14-16 December 2023

28. Invited Talk: “Understanding lattice geometry-driven energy dispersion in topological materials” at  Annual Conference on Quantum Condensed Matter (QMAT) 2023, NISER Bhubaneswar India, 27-30 November 2023

29. Member of Discussion Panel: “Electronic Structure in India” at National Conference on Electronic Structure (NCES) 2023, IOP Bhubaneswar, Orissa, India, 15-17 November 2024

30. Invited Talk: “Theoretical design of atomically thin materials with topological twists” at Recent Trends In Condensed Matter Physics (RTCMP) 2023, IACS Kolkata, West Bengal, India, 12-13 January 2023

31. Invited Talk: “Bottom-up synthesized atomically thin materials with switchable electronic and topological states” at National Conference on Electronic Structure (NCES) 2022, Goa University, Goa, India, 14-16 November 2022

32. NPL Institute Colloquium: “Symmetry, Topology, and Electronic Structure of Quantum Materials” at CSIR-National Physical Laboratory New Delhi, India, 09 September 2022

33. Invited Talk: “Topological quantum magnets: From concept to material realizations” at 65th DAE-SSPS 2021, BARC Mumbai, India, 15-19 December 2021

34. Invited Talk: “Magnetically controlled nontrivial states in topological materials” at Annual Conference on Quantum Condensed Matter (QMAT) 2021, TIFR Mumbai, India, 08-11 December 2021

35. Invited Talk: “Topology, Symmetry, and Magnetism in Quantum Materials” at Young Investigators Meet on Quantum Condensed Matter Theory (YIMQCMT) 2021, NISER Bhubaneswar, India, 16-19 November 2021

36. Department Seminar: “Quantum Materials: Transformational Opportunities for Fundamental Science and Applications” at DCMPMS, Tata Institute of Fundamental Research, Mumbai, India, August 2019

37. Department Seminar: “Exotica of Topological Materials: From Insulators to Semimetals and Superconductors” at DCMPMS, Tata Institute of Fundamental Research, Mumbai, India, August 2019

38. Department Seminar: “Topological materials and 2D thin films beyond graphene” at Department of Physics, Himachal Pradesh University Shimla, India, March 2018

39. Department Seminar: “Topological Materials: From Insulators to Semimetals” at Department of Physics, Indian Institute of Technology Kanpur, India, April 2017

40. Department Seminar: “Discovery of first type-II Weyl fermion semimetal state in LaAlGe materials” at Department of Physics, Indian Institute of Technology Kanpur, India, February 2017

41. Institute Colloquium: “Discovery of topological insulator and Weyl semimetal state in TlBiSe2 and LaAlGe class of materials” at Institute of Nano Science and Technology, Mohali, India, February 15, 2017

A few selected contributed talks

• Topological hourglass Dirac semimetal in Ag2BiO3, Bahadur Singh, Barun Ghosh, Chenliang Su, Hsin Lin, Amit Agarwal, Arun Bansil. American Physical Society March Meeting, Boston, Massachusetts, USA, March 2019 

• Clarification of charge-density wave gap symmetry and topology in bulk 1T-TiSe2, Shin-Ming Huang, Suyang Xu, Bahadur Singh, Ming-Chien Hsu, Chuang-Han Hsu, Chenliang Su, Arun Bansil, and Hsin Lin, American Physical Society March Meeting, Boston, Massachusetts, USA, March 2019 

• A new topological crystalline insulator state in the TaAs2 materials class, Baokai Wang, Barun Ghosh, Wei-Chi Chiu, Bahadur Singh, Chenliang Su, Amit Agarwal, Hsin Lin, and Arun Bansil. American Physical Society March Meeting, Boston, Massachusetts, USA, March 2019 

• Unified microscopic description of the origin and interplay between CDW and superconducting order in TiSe2, Vitor Pereira, Chuan Chen, Lei Su, Bahadur Singh, Antonio Helio Castro Neto, and Hsin Lin, American Physical Society March Meeting, Boston, Massachusetts, USA, March 2019 

• Observation of surface Dirac dispersion in transition metal dipnictides, Gyanendra Dhakal, Md Mofazzel Hosen, Wei-Chi Chiu, Bahadur Singh, Klauss Dimitri, Baokai Wang, Firoza Kabir, Christopher Sims, Sabin Regmi, Hsin Lin, Dariusz Kaczorowski, Arun Bansil, and Madhab Neupane American Physical Society March Meeting, Boston, Massachusetts, USA, March 2019 

• Comparative first-principles study of a prototypical Dirac semimetal by GGA and SCAN meta-GGA energy functionals, Wei-Chi Chiu, Bahadur Singh, Johannes Nokelainen, Chenliang Su, Hsin Lin, Bernardo Barbiellini, and Arun Bansil, American Physical Society March Meeting, Boston, Massachusetts, USA, March 2019 

• Topological tunability from even-odd order parameter mixing of monolayer 1T-TiSe2 charge density wave, Ming-Chien Hsu, Shin-Ming Huang, Bahadur Singh, Chuang-Han Hsu, Suyang Xu, Hsin Lin, Chenliang Su, and Arun Bansil. American Physical Society March Meeting, Boston, Massachusetts, USA, March 2019 

• Saddle-like topological surface states on the TT'X family of compounds (T, T' = Transition metal, X= Si, Ge), Bahadur Singh, Xiaoting Zhou, Hsin Lin, Arun Bansil. American Physical Society March Meeting, Los Angeles, California, USA, March 2018 

• Topological Hopf and Chain Link Semimetal States and Their Application to Co2MnGa, Daniel Multer, Guoqing Chang, Suyang Xu, Xiaoting Zhou, Shin-Ming Huang, Bahadur Singh, Baokai Wang, Ilya Belopolski, Jiaxin Yin, Songtian Sonia Zhang, Arun Bansil, Hsin Lin, and Zahid Hasan. American Physical Society March Meeting, Los Angeles, California, USA, March 2018 

• Experimental investigation of Co2MnGa: candidate for the first intrinsic, three-dimensional topological magnet, Ilya Belopolski, Daniel Sanchez, Guoqing Chang, Kaustuv Manna, Benedikt Ernst, Suyang Xu, Songtian Sonia Zhang, Hao Zheng, Jiaxin Yin, Bahadur Singh, Guang Bian, Daniel Multer, Xiaoting Zhou, Shin-Ming Huang, Baokai Wang, Arun Bansil, Hsin Lin, Claudia Felser, and Zahid Hasan. American Physical Society March Meeting, Los Angeles, California, USA, March 2018

• Universal Topological Electronic Properties of Nonmagnetic Chiral Crystals, Guoqing Chang, Benjamin Wieder, Frank Schindler, Daniel Sanchez, Ilya Belopolski, Shin-Ming Huang, Bahadur Singh, Di Wu, Tay-Rong Chang, Titus Neupert, Suyang Xu, Hsin Lin, and Zahid Hasan. American Physical Society March Meeting, Los Angeles, California, USA, March 2018

• Discovery of Lorentz-violating type-II Weyl fermions in LaAlGe, Daniel S. Sanchez, Su-Yang Xu, Nasser Alidoust, Guoqing Chang, Hong Lu, Bahadur Singh, Ilya Belopolski, Xiao Zhang, Guang Bian, Hao Zheng, Marius-Adrian Husanu, Yi Bian, Shin-Ming Huang, Chuang-Han Hsu, Tay-Rong Chang, Horng-Tay Jeng, Arun Bansil, Titus Neupert, Vladimir N. Strocov, Hsin Lin, and Shuang Jia, M. Zahid Hasan. American Physical Society March Meeting, New Orleans, Louisiana, USA, March 2017 

• Strategies for Designing Magnetic Weyl Semimetals, Guoqing Chang, Su-Yang Xu, Hao Zheng, Bahadur Singh, Chuang-Han Hsu, Shin-Ming Huang, Guang Bian, Ilya Belopolski, Daniel S. Sanchez, Nasser Alidoust, Tay-Rong Chang, Hong Lu, Xiao Zhang, Yi Bian, Zhi-Ming Yu, Shengyuan A. Yang, Horng-Tay Jeng, Titus Neupert, Shuang Jia, Arun Bansil, Hsin Lin, and M. Zahid Hasan. American Physical Society March Meeting, New Orleans, Louisiana, USA, March 2017 

• Quasiparticle interference mapping of ZrSiS, Michael Lodge, Md Mofazzle Hosen, Madhab Neupane, Masa Ishigami, Guoqing Chang, Bahadur Singh, Hsin Lin, Bent Weber, Jack Hellerstedt, Mark Edmonds, Michael Fuhrer, and Dariusz Kaczorowski. American Physical Society March Meeting, New Orleans, Louisiana, USA, March 2017 

• Identifying the Dirac line node in the 3D semimetal ZrSiS, Bent Weber, Michael S Lodge, Guoqing Chang, Bahadur Singh, Jack Hellerstedt, Mark Edmonds, Dariusz Kaczorowski, Md Mofazzel Hosen, Madhab Neupane, Hsin Lin, Michael S Fuhrer, and Masa Ishigami. American Physical Society March Meeting, New Orleans, Louisiana, USA, March 2017 

• Role of Surface Termination in Realizing Well-Isolated Topological Surface States in TlBiSe2 and TlBiTe2, Bahadur Singh, Hsin Lin, R. Prasad, and A. Bansil. IUMRS-ICEM2016, Suntec Singapore, July 2016. 

• A Computational Approach to Understand the Promotional Effect in Ni-Fe Bimetallic Catalyst, Koustuv Ray, Dharmendra Pandey, Bahadur Singh, Rajendra Prasad and Goutam Deo, XII European Congress on Catalysis, Kazan, Russia, September 2015. 

• Orbital selective spin-texture in a topological insulator, Bahadur Singh and R. Prasad. International conference on condensed matter physics-2014 (ICCMP-2014), Shimla, India, November 2014. [Best oral Presentation award] 

• Topological phases and Weyl semimetal in thallium based III-V-VI2 ternary chalcogenides, Bahadur Singh, R. Prasad, H. Lin, M.Z. Hasan, A. Bansil. MRS Fall meeting, Boston, MA, USA, November 2012.