# Shailesh Chandrasekharan

## Professor of Physics

### Overview

Prof. Chandrasekharan is interested in understanding quantum field theories non-perturbatively from first principles calculations. His research focuses on lattice formulations 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 recently 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.

Chandrasekharan, S., and A. Li. “The generalized fermion-bag approach.” *Proceedings of Science*, vol. 139, Jan. 2011.

Chandrasekharan, S., and A. Li. “Anomaly and a QCD-like phase diagram with massive bosonic baryons.” *Journal of High Energy Physics*, vol. 2010, no. 12, Dec. 2010. *Scopus*, doi:10.1007/JHEP12(2010)021.
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Liu, Dong E., et al. “Quantum phase transition and emergent symmetry in a quadruple quantum dot system..” *Physical Review Letters*, vol. 105, no. 25, Dec. 2010. *Epmc*, doi:10.1103/physrevlett.105.256801.
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Liu, D. E., et al. “Conductance of quantum impurity models from quantum monte carlo.” *Physical Review B Condensed Matter and Materials Physics*, vol. 82, no. 16, Oct. 2010. *Scopus*, doi:10.1103/PhysRevB.82.165447.
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Chandrasekharan, S. “Fermion bag approach to lattice field theories.” *Physical Review D Particles, Fields, Gravitation and Cosmology*, vol. 82, no. 2, July 2010. *Scopus*, doi:10.1103/PhysRevD.82.025007.
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Banerjee, D., and S. Chandrasekharan. “Finite size effects in the presence of a chemical potential: A study in the classical nonlinear O(2) sigma model.” *Physical Review D Particles, Fields, Gravitation and Cosmology*, vol. 81, no. 12, June 2010. *Scopus*, doi:10.1103/PhysRevD.81.125007.
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Podolsky, D., et al. “Phase transitions of S=1 spinor condensates in an optical lattice.” *Physical Review B Condensed Matter and Materials Physics*, vol. 80, no. 21, Dec. 2009. *Scopus*, doi:10.1103/PhysRevB.80.214513.
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Kaul, R. K., et al. “Ground state and excitations of quantum dots with magnetic impurities.” *Physical Review B Condensed Matter and Materials Physics*, vol. 80, no. 3, Aug. 2009. *Scopus*, doi:10.1103/PhysRevB.80.035318.
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Chandrasekharan, S., et al. “Rotor spectra, berry phases, and monopole fields: From antiferromagnets to QCD.” *Physical Review D Particles, Fields, Gravitation and Cosmology*, vol. 78, no. 7, Oct. 2008. *Scopus*, doi:10.1103/PhysRevD.78.077901.
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Cecile, D. J., and S. Chandrasekharan. “Role of the σ resonance in determining the convergence of chiral perturbation theory.” *Physical Review D Particles, Fields, Gravitation and Cosmology*, vol. 77, no. 9, May 2008. *Scopus*, doi:10.1103/PhysRevD.77.091501.
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