Professor of Physics
Prof. Chandrasekharan is interested in understanding quantum field theories non-perturbatively from first principles calculations. His research focuses on lattice formulations of these theories with emphasis on strongly correlated fermionic systems of interest in condensed matter, particle and nuclear physics. He develops novel Monte-Carlo algorithms to study these problems. He is particularly excited about solutions to the notoriously difficult sign problem that haunts quantum systems containing fermions and gauge fields. He has proposed an idea called the fermion bag approach, using which he has been able to solve numerous sign problems that seemed unsolvable earlier. Using various algorithmic advances over the past decade, he is interested in understanding the properties of quantum critical points containing interacting fermions. Some of his recent publications can be found here. Recently he is exploring how one can use quantum computers to solve quantum field theories.
Lattice and Effective Field Theory Studies of Quantum Chromodynamics awarded by Department of Energy (Co-Principal Investigator). 2005 to 2021
Quantum Field Theory as Spin Models on Quantum Computers awarded by Los Alamos National Laboratory (Principal Investigator). 2019 to 2020
Coherence and Correlations in Electronic Nanostructures awarded by National Science Foundation (Co-Principal Investigator). 2005 to 2009
Coherence and Correlation in Electronic Nanostructures awarded by National Science Foundation (Co-Principal Investigator). 2001 to 2006
Toward the Chiral Limit in QCD awarded by Department of Energy (Principal Investigator). 2003 to 2005
Quantum Chromodynamics and Nuclear Physics at Extreme Energy Density awarded by Department of Energy (Co-Principal Investigator). 1995 to 2005
Frank, J., et al. “Emergence of Gauss' law in a Z2 lattice gauge theory in 1 + 1 dimensions.” Physics Letters, Section B: Nuclear, Elementary Particle and High Energy Physics, vol. 806, July 2020. Scopus, doi:10.1016/j.physletb.2020.135484. Full Text
Huffman, E., and S. Chandrasekharan. “Fermion-bag inspired Hamiltonian lattice field theory for fermionic quantum criticality.” Physical Review D, vol. 101, no. 7, Apr. 2020. Scopus, doi:10.1103/PhysRevD.101.074501. Full Text
Banerjee, Debasish, et al. “Conformal Dimensions in the Large Charge Sectors at the O(4) Wilson-Fisher Fixed Point.” Physical Review Letters, vol. 123, no. 5, Aug. 2019, p. 051603. Epmc, doi:10.1103/physrevlett.123.051603. Full Text
Singh, H., and S. Chandrasekharan. “Few-body physics on a spacetime lattice in the worldline approach.” Physical Review D, vol. 99, no. 7, Apr. 2019. Scopus, doi:10.1103/PhysRevD.99.074511. Full Text
Ayyar, V., and S. Chandrasekharan. “Generating a nonperturbative mass gap using Feynman diagrams in an asymptotically free theory.” Physical Review D, vol. 96, no. 11, Dec. 2017. Scopus, doi:10.1103/PhysRevD.96.114506. Full Text
Huffman, E., and S. Chandrasekharan. “Fermion bag approach to Hamiltonian lattice field theories in continuous time.” Physical Review D, vol. 96, no. 11, Dec. 2017. Scopus, doi:10.1103/PhysRevD.96.114502. Full Text
Hann, C. T., et al. “Solution to the sign problem in a frustrated quantum impurity model.” Annals of Physics, vol. 376, Jan. 2017, pp. 63–75. Scopus, doi:10.1016/j.aop.2016.11.006. Full Text
Huffman, Emilie, and Shailesh Chandrasekharan. “Solution to sign problems in models of interacting fermions and quantum spins.” Physical Review. E, vol. 94, no. 4–1, Oct. 2016, p. 043311. Epmc, doi:10.1103/physreve.94.043311. Full Text
Chandrasekharan, Shailesh, et al. Baryon bag simulation of QCD in the strong coupling limit. arXiv.org, 2019. Open Access Copy
Ayyar, V., and S. Chandrasekharan. “Generating a mass gap using Feynman diagrams in an asymptotically free theory.” Epj Web of Conferences, vol. 175, 2018. Scopus, doi:10.1051/epjconf/201817511010. Full Text
Singh, H., and S. Chandrasekharan. “Worldline approach to few-body physics on the Lattice.” Proceedings of Science, vol. 334, 2018.
Chandrasekharan, S. “Fermion bags, topology and index theorems.” Proceedings of Science, vol. Part F128557, 2016.
Chandrasekharan, S. “Quantum critical behavior with massless staggered fermions in three dimensions.” Proceedings of Science, vol. 29-July-2013, 2013.
Cecile, D. J., and S. Chandrasekharan. “-Resonance and convergence of chiral perturbation theory.” Proceedings of Science, vol. 66, 2008.
Monte Carlo calculations of conformal dimensions of large charge operators. Invited talk at the program on Quantum Mechanical Systems at Large Charge. Simons Center for Geometry and Physics. August 26, 2019 - September 20, 2019
Conformal dimensions in large charge sectors using “qubit” formulations. Invited talk at the annual workshop on Lattice for Beyond the Standard Model Physics. Syracuse University. May 2, 2019 - May 3, 2019
Co-Chair, Organizing Committee. Diagrammatic Mote Carlo methods in Nuclear, Particle and Condensed Matter Physics.. Mainz Institute for Theoretical Physics (MITP).. September 18, 2017 - September 29, 2017