Sumiran Pujari
Associate Professor
Phone:
(+91) 22-2576-9376
Email:
sumiran@phy.iitb.ac.in
sumiran.pujari@iitb.ac.in
Office:
221 Physics
Research Interests:
- Condensed Matter Theory
- Quantum Magnetism
- Algorithms
Selected Publications:
- Punctured-Chern topological invariants for semi-metallic bandstructures,
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.
--------------------------------------- Peripatetic Postdoc Phase -----------------------------------------
- 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 (These slides contain unpublished results on SU(N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 : https://arxiv.org/a/pujari_s_1.html
A few papers resulting through collaborations in the engineering discipline are not in this list.
Miscellaneous:
Research Category: