Tanvir M. Mahim

Tanvir Mahmud Mahim

Adjunct Lecturer and Research Assistant, Department of Electrical and Electronic Engineering, BRAC University. My research addresses quantum optics and photonics, together with 2D quantum materials and microelectromechanical systems. I formulate device physics in a differentiable form so that hardware may be designed through optimization rather than by manual tuning.

My work develops the device physics of squeezed-light sources and color-center sensors, and of monolayer transistors and microelectromechanical transducers. Each device is modeled from first principles through to the quantities that an experimental measurement or a circuit simulation reports. The same models are then inverted: given a target specification, the objective is to determine the geometry that achieves it and to establish whether that geometry remains viable under realistic process variation. Because this inversion requires the governing physics to be differentiable, the simulators I develop are constructed to admit gradients throughout. Code and datasets are released openly.

Quantum optics and photonics, conducted with Dr. A. S. M. Mohsin. This work develops the complete optical model, from full-vector mode solving through Lugiato–Lefever propagation to Heisenberg–Langevin noise analysis, and carries it through to experimentally detectable quantities. An auxiliary Purcell-extraction ring in a 4H-SiC soliton-crystal microcomb raises detectable squeezing beyond the conventional 3 dB limit to 8.5 dB, and a pick-and-place diamond micromembrane NV sensor localizes individual vortices in tantalum circuits to 13 nm. Where measurement itself constrains progress, machine learning is embedded within the instrument.

2D quantum materials and MEMS, conducted with Prof. Md. Mosaddequr Rahman. The methods employed include frozen-phonon density functional theory, two-valley Boltzmann transport, self-consistent electrostatics and TCAD, applied continuously from the atomic scale through to circuit-level figures of merit rather than terminating at the band structure. Two Raman modes in a monolayer nanoribbon distinguish edge charge from edge strain, converting a spectroscopic observation into a quantitative electrostatic measurement, while one percent biaxial compression in a WSe2 ferroelectric transistor more than doubles hole mobility without degrading the memory window.

Wide-bandgap devices and design automation, conducted with Dr. Nadim Chowdhury at BUET. The same methodology is applied at circuit level: adjoint co-design of a monolithic GaN-on-SOI fractional-N phase-locked loop, a graph reinforcement-learning framework developed with GlobalFoundries, Inc. for transistor sizing that transfers across technology nodes, and the technology development of a 100 V GaN-on-Si HEMT taped out at X-FAB. The Research page presents each project in full, with figures, code and data.

I completed the B.Sc. in Electrical and Electronic Engineering at BRAC University in December 2022 with High Distinction, and subsequently joined the department as a Teaching Assistant, then as a Research Assistant, and since June 2025 as an Adjunct Lecturer. My earlier research was conducted with Dr. A. H. M. A. Rahim, who retired in December 2024, and addressed reinforcement-learning fuzzy control of microgrids and multi-machine networks, together with the modeling of custom-built bifacial photovoltaic panels.

I welcome correspondence on any of these topics, as well as inquiries regarding collaboration, at tanvir.mahim@bracu.ac.bd.

Research interests

  • Quantum Optics and Photonics
  • 2D Quantum Materials
  • Microelectromechanical Systems (MEMS)
  • Wide Bandgap (WBG) Semiconductor Devices
  • Electronic Design Automation (EDA)
  • Machine Learning

News

  • Jun 2026 Our paper on adaptive Takagi–Sugeno–Kang fuzzy inference with reinforcement learning for low-voltage ride-through of DFIG wind turbines is published in Engineering Science and Technology, an International Journal. Details
  • Dec 2025 Joined GIXSystems.ai (USA) as a consultant, working on the technology development of a 100 V GaN-on-Si power HEMT discrete device, with tape-out at X-FAB in Erfurt, Germany.
  • Sep 2025 Our review of the challenges and prospects in agrivoltaics appears online in Advanced Energy and Sustainability Research (Wiley, open access); it runs in the January 2026 issue.
  • Aug 2025 BRAC University featured our work in its news, highlighting the IEEE Transactions on Fuzzy Systems and IEEE Sensors Journal papers with Prof. Md. Mosaddequr Rahman and Prof. A. H. M. A. Rahim.
  • Jul 2025 Began research in quantum optics and photonics with Dr. A. S. M. Mohsin, covering soliton-crystal microcombs, NV micromembrane vortex sensing, and closed-loop machine learning for quantum photonic instrumentation. Read more
  • Jul 2025 Our hierarchical inverse-design framework for unit-cell CMUTs is published in the IEEE Sensors Journal, with the dataset released on Zenodo.
  • Jun 2025 Appointed Adjunct Lecturer in the Department of EEE, BRAC University, teaching Solid-State Devices, Numerical Methods, and Microprocessor & Embedded Systems.
  • May 2025 Started work on wide-bandgap electronic devices with Dr. Nadim Chowdhury at BUET, including a collaboration with GlobalFoundries, Inc. (Santa Clara, USA) on graph reinforcement learning for transferable analog transistor sizing.
  • Feb 2025 Our adaptive fuzzy attention inference controller for microgrids under extreme grid-bus faults appears in IEEE Transactions on Fuzzy Systems.
  • Jul 2024 Began research on 2D quantum materials and MEMS with Prof. Md. Mosaddequr Rahman, spanning nanoribbon transistors, ferroelectric WSe2 logic, and fabrication-aware inverse design.
  • Jul 2024 Our weather-responsive multidimensional efficiency model for custom-built bifacial panels is published in the IEEE Journal of Photovoltaics.
  • Mar 2024 Our comparative review of mono- and bifacial photovoltaic technologies appears in the IEEE Journal of Photovoltaics.
  • Aug 2023 Profiled by the Aspire Institute in its First-Gen Friday series, during the Aspire Leaders Program, which was founded at Harvard University in 2017 and became an independent institute in 2021.
  • Dec 2022 Completed the B.Sc. in Electrical and Electronic Engineering at BRAC University with High Distinction.