Publications

Pre-prints

[P3] Vivek N. Bhat, Karandeep Singh, Rittika Dey, Arindam Ghosh, Satish A. Patil, and Vivek Tiwari, “Dopant induced interchain interactions enhance polythiophene electrical conductivity at low dopant concentrations ”, * denotes equal authors. submitted September 2025

[P2] Sanjoy Patra, Atandrita Bhattacharyya, Ch. Mudasar Hussain, Vijay P. Singh, Supriyo Santra, Debashree Ghosh, Pritam Mukhopadhyay, and Vivek Tiwari, “Intramolecular Singlet Fission Through a Coherently Coupled Excimer-like Intermediate”, arXiv August 2025

[P1] Asha Thomas, Camelia Roy, Indranil Roy, Vivek N. Bhat, Sayan Ghosh, and Vivek Tiwari, “Disordered Photosynthetic Aggregates Can Host Functional Vibronic Couplings At Room Temperature”, arXiv July 2025

Published Articles

[MS11] Amitav Sahu and Vivek Tiwari, “Isolating non-adiabatically enhanced ground state quantum beats through two-dimensional electronic spectroscopy”, J. Chem. Phys. (2024), 162, 064201. url Special Issue: David Jonas Festschrift

J. Chem. Phys. and Chem. Phys. Rev. Editors' Choice 2024 - url

"a few of the many notable JCP and CPR articles of 2024 that present significant and definitive research in experimental and theoretical areas of the field. "

[MS10] Asha S. Thomas, Vivek N. Bhat, and Vivek Tiwari, “Rapid scan white light two-dimensional electronic spectroscopy with 100 kHz shot-to-shot detection”, J. Chem. Phys. (2023), 159, 244202. url (*denotes equal authors)

JCP Editors' Choice 2023, Feature Article

(top 3% papers in the field selected by the editors)

Read the IISc Press release here: Exciting Everything Everywhere All At Once

Patents

IPO/202241074681
PCT/IN2023/050664

Tiwari, V., Bhat, V. N. & Thomas, A. S. WO2024134663 (2025) - System and Method for Variable Repetition Rate Shot-to-shot Rapid Scan Pump-probe and 2D Electronic Spectroscopy. URL

[MS9] Atandrita Bhattacharyya, Amitav Sahu, Sanjoy Patra, and Vivek Tiwari, “Low- and high-frequency vibrations synergistically enhance singlet exciton fission through robust vibronic resonances”, Proc. Natl. Acad. Sci. USA (2023), 120 (49), e2310124120. url

The first step of singlet exciton fission proceeds through coupled nuclear and electronic motions - Fission of photoexcited singlets into triplet pairs promises disruptive next-generation solar cells. However physical principles which govern its first steps even in archetypal acene-based systems remain poorly understood. We show that synergy between low- and high-frequency vibrations vitally enhances this process and can be unambiguously deciphered by two-dimensional electronic spectroscopy experiments. Our study motivates leveraging vibrational-electronic couplings to design new singlet fission materials.

Read the IISc Press release here - Beats that matter

[MS8] Vivek N Bhat, Asha S Thomas, Atandrita Bhattacharyya and Vivek Tiwari, “Rapid scan white light pump–probe spectroscopy with 100 kHz shot-to-shot detection”, OSA Optics Continuum (2023), 2, 1981. url (*denotes equal authors)

High-throughput pump-probe spectroscopy - We report a novel synchronization scheme which pushes state-of-the-art pump-probe towards repetition-rate scalable high-throughput spectroscopy. Applications include pump-probe microscopy of photovoltaic devices and non-linear tissue imaging.

OSA Optics Continuum Most Downloaded Paper, Sept 2023

[MS7] Amitav Sahu and Vivek Tiwari, “Vibrations That Do Not Promote Vibronic Coupling Can Dominate Observed Lineshapes in Two-Dimensional Electronic Spectroscopy”, Journal of Physical Chemistry Letters (2023), 14, 4617. url

Deciphering quantum dynamics of energy transfer from 2D lineshapes - We show that vibrations that do not promote vibronic coupling can in fact be key witnesses of the microscopic details underlying electronic relaxation. These subtle details are manifested in 2D lineshapes in multidimensional spectroscopy. We make these connections to resolve conflicting spectroscopic observations reported in recent literature.

[MS6] Amitav Sahu, Vivek Bhat, Sanjoy Patra, and Vivek Tiwari, “High-sensitivity Fluorescence-Detected Multidimensional Electronic Spectroscopy Through Continuous Pump-probe Delay Scan”, Journal of Chemical Physics (2023), 158, 024201. url

Pushing the state-of-the-art in Multidimensional Spectroscopy - In this work, we report detection of vibrational quantum beats at room temperature with 300x higher sensitivity than current state-of-the-art multidimensional spectroscopy. This allows to resolve such quantum beats as 2D Coherence Maps, with separation of ground versus excited state wavepacket motions using the phase of the quantum beat.

Selected in the 2022 JCP Emerging Investigators Special Collection url

[MS5] Sanjoy Patra and Vivek Tiwari, “Vibronic resonance along effective modes mediates selective energy transfer in excitonically coupled aggregates”, Journal of Chemical Physics (2022), 156, 184115. url

Published in the special issue "Time-resolved Vibrational Spectroscopy"

[MS4] Vivek Tiwari, “Multidimensional electronic spectroscopy in high-definition—Combining spectral, temporal, and spatial resolutions”, Journal of Chemical Physics (2021), 154, 230901. url

Featured as J. Chem. Phys. Most Read Perspectives 2021 url

[MS3] Sanjoy Patra, Amitav Sahu, and Vivek Tiwari, “Effective Normal Modes Identify Vibrational Motions which Maximally Promote Vibronic Mixing in Excitonically Coupled Aggregates”, Journal of Chemical Physics Communication (2021), 154, 111106. url

Here's a plain summary of our work - Summary

Selected in the 2021 JCP Emerging Investigators Special Collection url

[MS2] Aiswarya A Mohapatra, Vivek Tiwari* and Satish A Patil, “Energy transfer in ternary blend organic solar cells: recent insights and future directions”, Energy and Environmental Science (2021), 14, 302. Perspective Article, url ( denotes corresponding authors)

[MS1] Amitav Sahu, Jo Sony Kurian and Vivek Tiwari, “Vibronic Resonance is Inadequately Described by One-particle Basis Sets”, Journal of Chemical Physics (2020), 153, 224114. url.

Selected as Feature Article (among top 3% papers selected by J. Chem. Phys. Editors')

Publications from PI's Ph.D. and Postdoctoral Work

[12] Tenzin Kunsel, Vivek Tiwari, Yassel Acosta-Matutes, Alastair T Gardiner, Richard J Cogdell, Jennifer P Ogilvie, and Thomas L C Jansen, "Simulating Fluorescence-Detected Two-Dimensional Electronic Spectroscopy of Multichromophoric Systems", Journal of Physical Chemistry B 2019, 123, 394, url

[11] Vivek Tiwari, Yassel Acosta-Matutes, Alastair T Gardiner, Thomas L C Jansen, Richard J Cogdell, and Jennifer P Ogilvie, "Spatially-resolved fluorescence-detected two-dimensional electronic spectroscopy probes varying excitonic structure in photosynthetic bacteria", Nature Communications (2018), 9, 4219, url, Editors' Choice Article

[10] Vivek Tiwari, Yassel Acosta-Matutes, Arkaprabha Konar, Zhanqian Yu, Marcin Ptaszek, David F Bocian, Dewey Holten, Christine Kirmaier, and Jennifer P Ogilvie, "Strongly coupled bacteriochlorin dyad studied using phase-modulated fluorescence-detected two-dimensional electronic spectroscopy", Optics Express (2018), 26, 22327, url.

[9] Vivek Tiwari and David M Jonas, "Electronic energy transfer through non-adiabatic vibrational-electronic resonance. II. 1D spectra for a dimer", Journal of Chemical Physics (2018), 148, 084308, url

[8] William K Peters, Vivek Tiwari and David M Jonas, "Nodeless vibrational amplitudes and quantum nonadiabatic dynamics in the nested funnel for a pseudo Jahn-Teller molecule or homodimer", Journal of Chemical Physics (2017), 147,194306, url.

[7] Vivek Tiwari, William K Peters, David M Jonas, "Electronic energy transfer through non-adiabatic vibrational-electronic resonance. I. Theory for a dimer", Journal of Chemical Physics (2017), 147, 154308, url

[6] Katherine A Kitney-Hayes, Allison A Ferro, Vivek Tiwari, and David M Jonas, "Two-dimensional Fourier transform electronic spectroscopy at a conical intersection", Journal of Chemical Physics (2014), 140, 124312, url

[5] Vivek Tiwari, William K Peters, and David M Jonas, "Vibronic coherence unveiled", Nature Chemistry (2014), 6, 173, url, News and Views.

[4] Byungmoon Cho, Vivek Tiwari and David M Jonas, "Simultaneous all-optical determination of molecular concentration and extinction coefficient", Analytical Chemistry (2013), 85, 5514, url

[3] Vivek Tiwari, William K Peters, and David M Jonas, "Electronic resonance with anticorrelated pigment vibrations drives photosynthetic energy transfer outside the adiabatic framework", Proc Natl Acad Sci, USA (2013), 110, 1203, url, Cover Mention with Commentary, Science Editors' Choice.

[2] Byungmoon Cho*, Vivek Tiwari*, Robert J Hill, William K Peters, Trevor L Courtney, Austin P Spencer, and David M Jonas, "Absolute Measurement of Femtosecond Pump–Probe Signal Strength", Journal of Physical Chemistry A (2013), 117, 6332, url. * denotes equal authors.

[1] Byungmoon Cho, William K Peters, Vivek Tiwari, Austin P Spencer, Dmitry Baranov, Robert J Hill, and David M. Jonas, "Absolute femtosecond measurements of Auger recombination dynamics in lead sulfide quantum dots", Europhysics Letters (2012), 60, 924, url.

[0] SKK Kumar, Vivek Tiwari, Tapas Goswami, and Debabrata Goswami, "Spectrally resolved photon echo spectroscopy of Zn (II), Co (II) and Ni (II)–octaethyl porphyrins", Chemical Physics Letters (2009), 476, 31, url.

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