Biography
Varun is a Research Associate at the Cavendish Laboratory, Department of Physics, specializing in optical/THz spectroscopy of novel quantum materials, particularly Topological Insulators. Varun has a Ph.D. in Physics from the University of Cambridge. Before coming to Cambridge, Varun obtained his MSc. in Nanoelectronics from The University of Manchester and then briefly worked at the University of Hull on band engineering and optical properties of III-V semiconductors.
Research
Terahertz spectroscopy, Topological Insulators, Weyl Semimetals, 2D materials, Plasmonic metamaterials, Graphene.
Publications
1. ‘A general approach for hysteresis-free, operationally stable metal halide perovskite field effect transistors’ Satyaprasad P. Senanayak, Mojtaba Jalebi, Varun S. Kamboj, Remington Carey, Ravichandran Shivanna, Tian Tian, Guillaume Schweicher, Junzhan Wang, Nadia Giesbrecht, Daniele Di Nuzzo, Harvey Beere, Pablo Docampo, David A. Ritchie, David Fairen-Jimenez, Richard H. Friend, Henning Sirringhaus. Science advances 6 (15), eaaz4948 (2020).
2. ‘Probing the Electron-Phonon Interaction of Topological Surface States in Sb2Te3 Thin Films with THz Spectroscopy’. Varun S. Kamboj, Lukas Jakob, Angadjit Singh, Harvey E. Beere, David A. Ritchie. Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XIV, 2021 (Accepted).
3. ‘Temperature dependence of the ferromagnetic response in CrxSb2-xTe3 topological insulator thin films investigated using terahertz spectroscopy and magneto-transport (Invited)’ Varun S. Kamboj, Angadjit Singh, Lukas Jakob, Liam B. Duffy, Noorhayati Idros, Satyaprasad P. Senanayak, Adrian Ionescu, Harvey E. Beere, Crispin H. W. Barnes, Thorsten Hesjedal, David A. Ritchie. Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XII, 10917 (2019).
4. ‘Systematic Study of Ferromagnetism in CrxSb2-xTe3 Topological Insulator Thin Films using Electrical and Optical Techniques’
Angadjit Singh, Varun S. Kamboj, Jay Liu, Justin Llandro, Liam Duffy, Satyaprasad Senanayak, Harvey E. Beere, Adrian Ionescu, David. A Ritchie, Thorsten Hesjedal, Crispin H.W. Barnes. Scientific Reports (Nature publishing group) 8, 17024 (2018).
5. ‘Probing the Topological Surface State in Bi2Se3 Thin Films Using Temperature-Dependent Terahertz Spectroscopy’
Varun S. Kamboj, Angadjit Singh, Thierry Ferrus, Harvey E. Beere, Liam B. Duffy, Thorsten Hesjedal, Crispin H.W. Barnes and David A. Ritchie. ACS Photonics 4 (11), pp 2711-2718 (2017).
6. ‘Contactless graphene conductivity mapping on a wide range of substrates with terahertz time-domain reflection spectroscopy’ Hungyen Lin, Philipp Braeuninger-Weimer, Varun S. Kamboj, David S. Jessop, Riccardo Degl’Innocenti, Harvey E. Beere, David A. Ritchie, J. Axel Zeitler and Stephan Hofmann. Scientific Reports (Nature publishing group) 7, 10625 (2017).
7. ‘High open circuit voltages in lead-tin low bandgap perovskites based planar heterojunction photovoltaics’ Baodan Zhao, Mojtaba-Abdi Jalebi, Maxim Tabachnyk, Hugh Glass, Varun S. Kamboj, Wanyi Nie, Andrew J. Pearson, Yuttapoom Puttisong, Karl C. Gödel, Harvey E. Beere, David A. Ritchie, Aditya D. Mohite, Siân E. Dutton, Richard H. Friend and Aditya Sadhanala. Advanced Materials 29, 1604744 (2017).
8. ‘Active control of electromagnetically induced transparency in a terahertz metamaterial array with graphene for continuous resonance frequency tuning’ Stephen J. Kindness, Nikita Almond, Binbin Wei, Robert Wallis, Wladislaw Michailow Varun S. Kamboj, Philipp Braeuninger-Weimer, Stephan Hofmann, Harvey E. Beere, David A. Ritchie, Riccardo Degl'lnnocenti. Advanced Optical Materials, 1800570 (2018).
9. ‘External amplitude and frequency modulation of a terahertz quantum cascade laser using metamaterial/graphene devices’ Stephen Kindness, David Jessop, Binbin Wei, Robert Wallis, Varun Kamboj, Long Xiao, Yuan Ren, Philipp Braeuninger-Weimer, Adrianus Aria, Stephan Hofmann, Harvey Beere, David Ritchie, and Riccardo Degl'Innocenti. Scientific Reports (Nature publishing group) 7, 7657 (2017).
10. ‘Bolometric detection of terahertz quantum cascade lasers with graphene/plasmonic antenna arrays’ Riccardo Degl'Innocenti, Long Xiao, Stephen J. Kindness, Varun S. Kamboj, Binbin Wei, Philipp Braeuninger-Weimer, Adrianus I. Aria, Stephan Hofmann, Harvey E. Beere and David A. Ritchie. Journal of Physics D: Applied Physics 50 (17), 174001 (2017).
11. ‘Temperature evolution of topological surface states in Bi2Se3 thin films studied using terahertz spectroscopy’ Varun S. Kamboj, Angadjit Singh, Harvey E. Beere, Thorsten Hesjedal, Crispin H.W. Barnes and David A. Ritchie. Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications X, 101030D (2017).
12. ‘Using Transmissive Photonic Band Edge Shift to Detect Explosives–A Study with 2, 4, 6 trinitrotolune (TNT)’. Noorhayati Idros, Man Yi Ho, Varun Kamboj, Hua Xu, ZhongZe Gu, Harvey E Beere, David A Ritchie, Daping Chu. ACS Photonics, 4 (2), pp 384–395 (2017).
Teaching and Supervisions
Waves and Optics II
System and Measurements I
Quantum Mechanics
Other Professional Activities
Member of IEEE
Menmer of IOP
