Bhavtosh Bansal
I am an experimental physicist. My recent work seems to be
mostly around exploring elementary phenomena, often through
analogies, using solid state systems. Some of the themes have
been
My colleague Bipul Pal and I share the spectroscopy laboratory and have been closely cooperating on many problems.
More recently, we have also been playing with soft matter---bubbles, foam, and hard spheres---and learning imaging and building microscopes.
Research pages (Group)
-
Physics of Phase transitions
- Physics of excitons [Pressure (Kothari-Mott) ionization, effect of perturbing electric and magnetic fields]
- Experimental signatures of zero-point motion, quantum coherence and dephasing, tunneling, and diffraction
My colleague Bipul Pal and I share the spectroscopy laboratory and have been closely cooperating on many problems.
More recently, we have also been playing with soft matter---bubbles, foam, and hard spheres---and learning imaging and building microscopes.
Research pages (Group)
- Spectroscopy Lab
- Phase transitions with hysteresis
- Pulsed Magnet Lab
- Foam, bubbles, non-linear physics
Selected Publications (complete list here)
- Evidence of athermal metastable
phase in a halide perovskite: Optically tracked
thermal-breach memory, Kingshuk Mukhuti, Satyaki Kundu,
Debasmita Pariari, Deepesh Kalauni, Ashutosh Mohanty,
Aniket Bajaj, D. D. Sarma, and Bhavtosh Bansal, Physical Review
Letters 134, 076901 (2025) [abstract]
[arXiv] [pdf]
- Exceptionally Slow, Long Range, and
Non-Gaussian Critical Fluctuations Dominate the Charge
Density Wave Transition,Sk Kalimuddin, Sudipta Chatterjee,
Arnab Bera, Hasan Afzal, Satyabrata Bera, Deep Singha Roy,
Soham Das, Tuhin Debnath, Bhavtosh Bansal, Mintu Mondal,
Physical Review Letters 132, 266504 (2024) [abstract] [arxiv]
- Critical slowing down at the abrupt Mott transition: When the first-order phase transition becomes zeroth-order and looks like second-order, Satyaki Kundu, Tapas Bar, Rajesh Kumble Nayak, Bhavtosh Bansal, Physical Review Letters, 124, 095703 (2020). [abstract] [pdf]
- Kinetic spinodal instabilities in the Mott transition in V2O3: Evidence from hysteresis scaling and dissipative phase ordering, Tapas Bar, Sujeet Kumar Choudhary, Md. Arsalan Ashraf, K. S. Sujith, Sanjay Puri, Satyabrata Raj, Bhavtosh Bansal, Physical Review Letters 121, 045701 (2018). [abstract] [pdf]
- Measurements of the electric field
of zero-point optical phonons in GaAs quantum wells
support the Urbach rule for zero-temperature lifetime
broadening, Rupak Bhattacharya, Richarj Mondal, Pradip
Khatua, A. Rudra, E. Kapon, S. Malzer, G. Doehler, Bipul
Pal, Bhavtosh Bansal, 2015, Physical Review Letters 114,
047402. [abstract]
[pdf]
[supplementary]
- Single-slit electron diffraction
with Aharonov-Bohm phase: Feynman's thought experiment
with quantum point contacts, Pradip Khatua, Bhavtosh
Bansal, Dan Shahar, 2014, Physical Review Letters 112,
010403
[pdf] [supplementary] [journal] [synopsis] [story in a German physics portal]
- Self-Assembly in semiconductor epitaxy: From growth mechanisms to device applications, Arnab Bhattacharya and Bhavtosh Bansal, Chapter 26 Handbook of Crystal Growth Vol. 3, 2nd Edition, Elsevier 2015, 1057–1099 Ed T. Kuech [abstract] [pdf]
Some
presentations
- Emphanisis [Dissipative atom tunneling?]
- Zeroth order critical phase transitions
- Picosecond
photodoping dynamics in a charged-ordered insulator
- Pulsed Magnetic Fields
Teaching lecture
- Advanced
Statistical Mechanics (Spring 2025)
- In the past I have taught Research Methodology, Thermal Physics, Statistical Physics and Advanced Statistical Physics, Classical Electrodynamics, Waves and Optics, and various undergraduate labs--1st year physics, 2nd year optics, condensed matter physics
- 2D
packing of hard spheres home experiment
- Handwritten
notes on magnetotransport (measurement of resistivity
tensors)
- Dripping faucet home experiment
- Fractal interface of wetting paper
- Fractals and scaling
- Introductory statistics (part of the Research Methodology course)
- Travails of camera shopping
Personal
Address
Department of Physical Sciences
IISER Kolkata, Mohanpur
Nadia 741246, West Bengal, INDIA
Office: 112 F, Research Complex
Email: bhavtosh@iiserkol.ac.in