• A general theorem on extensive ground state entropy in spin-1/2 models
  arXiv:2407.06236 
  Related seminar video here  or here and slides here (Part II).
  The two-dimensional model discussed here appears to be a new
  beast in the zoo of strongly correlated phases and possibly outside
  the string-net kind of correlated phases of Levin-Wen.

• A class of exactly solvable Hamiltonians for S=1/2 quantum magnets
  with spinless fermionic excitations in higher dimensions,
  arxiv:2406.17034 
  Part of the proceedings of the 67th DAE Solid State Physics Symposium.
  Related slides here (Part I). Material/Artificial realization for
  this class of models with bond-dependent couplings seems feasible.
  Could be relevant to both classical spin-based technologies
  and artificial quantum technologies (for more discussion on this,
  see the preprint). The "unfrustrated XX" case seems to be a
  genuinely new state of matter where a classical spin liquid
  coexists with a quantum spin liquid. (also see arXiv:2407.06236)

• Deconfined pseudocriticality in a model spin-1 quantum antiferromagnet,
  arXiv:2307.14254
  Related slides here.  Rejected by PRL and PRBL. Offered PRB.
  (Review exchange at this link ; names and accession code redacted)

• Punctured-Chern topological invariants for semi-metallic bandstructures, 
  Phys. Rev. Lett. 130, 186202 (2023), arXiv:2205.07814
  Related slides here. These invariants could be useful for anyone interested
  in band topology in presence of gap-closing points.

• Unusual spin dynamics in the low-temperature magnetically ordered state of Ag_3 Li Ir_2 O_6
  Phys. Rev. B 104, 115106 (2021), arXiv:2104.10057
  Related slides here that discuss the well-known (or perhaps little-known)
  issue about large muon relaxation rates in some ordered antiferromagnets
  (e.g. Gd_2 Sn_2 O_7 and also Ag_3 Li Ir_2 O_6) comparable to that of many
  spin liquid candidate materials.

• Resummation-based quantum Monte Carlo for quantum paramagnetic phases
  Phys. Rev. B 104, L060406 (2021), arXiv:2104.06792
  Related seminar video here and slides here.

• Bilayer Coulomb phase of two dimensional dimer models: Absence of power-law columnar order
  Phys. Rev. E 103, 042136 (2021), arXiv:2011.04506 
  Related seminar video here and slides here.

• Gapless quantum spin liquid in the triangular system Sr_3 Cu Sb_ 2 O_9
  Phys. Rev. Lett. 125, 267202 (2020), arXiv:2012.01239 
  Related colloquium-style seminar video here and slides here.

• Topological character of three-dimensional Nexus triple point degeneracies
  Phys. Rev. B 102, 235148 (2020),  arXiv:2006.00709 
  Related seminar video here and slides here.
  (a seminar video here and slides here on a previous work which was instrumental for this work.)

• Resonating three-coloring wavefunctions for the kagome quantum antiferromagnet
  Phys. Rev. B 99, 104433 (2019), arXiv:1808.08633 
  Related seminar video here and slides here.

• Interaction induced Dirac fermions in bilayer graphene
  Phys. Rev. Lett. 117, 086404 (2016), arXiv:1604.03876 
  Related slides here. (These slides contain unpublished results on SU(N>2) on-site
  Hubbard model on Bernal-stacked honeycomb bilayer, while the paper focused on
  SU(2). In short, for SU(4) there is a continuous quantum phase transition from a
  Dirac liquid to a Neél antiferromagnet similar to SU(2), while for SU(6) (and greater)
  there is a strong first-order transtion from the Dirac liquid to a valence bond solid.)

• Sign-problem-free Monte Carlo simulation of certain frustrated quantum magnets
  Phys. Rev. Lett. 117, 197203 (2016), arXiv:1511.01586 
  Related slides here by F. Alet.

• Transitions to valence-bond solid order in a honeycomb lattice antiferromagnet
  Phys. Rev. B 91, 104411 (2015), arXiv:1502.01035   
  Related slides here.

• Emergent spin excitations in a Bethe lattice at percolation
  Phys. Rev. Lett. 111, 157201 (2013), arXiv:1210.4621 

• "Inversion" techniques for Scanning Tunneling Microscopy data analyses
  Ph. D. Thesis (2011)
  Related slides here and thesis document here.

Most of my publications are listed here.

A playlist of my talk videos is available here.

A few papers resulting through collaborations in the engineering discipline are not in this list.

Extended collaborations:

• Sounak Biswas (2024-now, 2016-2017)
• Fabien Alet (2024-now, 2011-2014 (as postdoc mentor))
• Nisheeta Desai (2016-now)
• Ankur Das (2018-2024)
• Avinash Majahan (2018-2024)
• Kedar Damle (2019-2020, 2016-2017 (as postdoc mentor), 2011-2014 (as postdoc mentor))
  (introduced as the "fifth member of the spin quartet" by R. Moessner here though
  unfortunately not part of the video. For the spin quartet reference, see here 
  around the 17 minute mark.)
• Hitesh Changlani (2017-2021, 2008-2011)
• Christopher Henley (2012-2013, 2006-2011 (as Ph.D. guide))

Other collaborators:

• Roderich Moessner (2025-now)
• Eyal Cornfeld (2020-2022)
• Gopal Dixit (2020-2021)
• Chanchal Barman and Chiranjit Mondal (2019-2020)
• Ribhu Kaul (2014-2016 (as postdoc mentor)) and Ganpathy Murthy (2015-2016)
• Michael Lawler (2010-2012)

Old unpublished ideas:

• Work on a Ladder representation for the Generalized Heisenberg
  Algebra [x̂, p̂] = i (1 + β(x̂ 2 + p̂ 2 )). An earlier version of this work
  has a section on "Unnatural Numbers" which may be of interest or
  amusement to some. 2015-16. Review exchange here.

• Conjecture on an extension of the spontaneous symmetry 
  breaking idea from ordering to fluctuations. 2010-13. This idea is 
  wrong due to a wrong assumption about the microscopic classical
  dynamics that happens during equilibration. Such dynamics
  may be allowed in dissipative, non-equilibrium systems in steady
  steady state. I thank Veit Elser, Jim Sethna, Deepak Dhar and
  Clement Sire for giving their time to me to discuss this work.

Teaching history:

• 2023-24/1 PH 251 - Classical Mechanics (minor)
• 2023, Tutor for summer school on the physics of quantum matter
• 2021-22/2 PH 554 : Computational Many-body Physics
• 2021-22/1 PH 217 : Classical Mechanics
• 2021-22/2 PH 554 : Computational Many-body Physics
• 2021-22/1 PH 401 : Classical Mechanics
• 2020-21/2 PH 410 : Statistical Physics
• 2020-21/1 PH 401 : Classical Mechanics
• 2019-20/2 PH 438 : Statistical Physics
• 2019-20/1 PH 217 : Classical Mechanics
• 2018-19/2 PH 310 : Introduction to Condensed Matter Physics
• 2018-19/1 PH 409 : Introduction to Condensed Matter Physics
• 2017-18/2 EP 320 (now PH 438) Statistical Physics
• 2017-18/1 PH 409 : Introduction to Condensed Matter Physics 

Miscellaneous:

• a general talk video here given to IIT Bombay community on convocation-2020 speaker F. D. M. Haldane's Nobel prize winning work
• slides on an outreach talk here on "Differential Equations in Science and Engineering" given at Sharad Chandra ACS College, Naigaon, Nanded, Maharashtra on Feb, 2020
• my only published poem! The forgotten chapbook is avaiable here. Even received a cheque of ~15$ for the reading! which is now misplaced :( I would change a few things here and there in the poem now, but that's how it goes ...
  A video of the reading here; please excuse the cringe.
    some other writings here

Worldline:

• 1983: Sambalpur, Odisha (birth, Prasanta Kumar Pujari (retired executive metallurgical engineer, RSP), Arundhati Pati (retired senior reader in Home Science)) 
• 1983-2001: Rourkela, Odisha (childhood and schooling with Saswati Pujari)
• 2001-2005: Mumbai (undergraduate)
• 2005-2011: Ithaca, NY, USA (Ph.D. training)
• 2011-2014: Toulouse, France (postdoc)
• 2014-2016: Lexington, KY, USA (postdoc)
• 2016-now: Mumbai
• Summers of 2018,2019: Lexington, KY, USA (science + personal)
• October of 2022: Bordeaux, France (science)
• Winter of 2023: Trieste, Italy (science + visit)
• June of 2024: Toulouse, France (science)
• August of 2024: Bhubaneshwar, Odisha (science + personal)
• Oct-Nov of 2024: Toulouse, France (science + travel)
• Jan-Mar of 2025: Dresden, Germany (science + travel)