Sumiran Pujari
Associate Professor
(+91) 22-2576-9376

221 Physics

Research Interests: 
  • Condensed Matter Theory
  • Quantum Magnetism
  • Algorithms
Selected Publications: 
  • Punctured-Chern topological invariants for semi-metallic bandstructures,
    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 (These slides contain unpublished results on SU(N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.
------------------------------------------- Puerile Ph.D. Phase ---------------------------------------------
  • 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 at :

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



  • 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 
Research Category: