# 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 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.

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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Cecile, D. J., and S. Chandrasekharan. “Absence of vortex condensation in a two dimensional fermionic XY model.” *Physical Review D Particles, Fields, Gravitation and Cosmology*, vol. 77, no. 5, Mar. 2008. *Scopus*, doi:10.1103/PhysRevD.77.054502.
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Jiang, F. J., et al. “From an antiferromagnet to a valence bond solid: Evidence for a first-order phase transition.” *Journal of Statistical Mechanics: Theory and Experiment*, vol. 2008, no. 2, Feb. 2008. *Scopus*, doi:10.1088/1742-5468/2008/02/P02009.
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Cecile, D. J., and S. Chandrasekharan. “Modeling pion physics in the -regime of two-flavor QCD using strong coupling lattice QED.” *Physical Review D Particles, Fields, Gravitation and Cosmology*, vol. 77, no. 1, Jan. 2008. *Scopus*, doi:10.1103/PhysRevD.77.014506.
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Chandrasekharan, S. “A new computational approach to lattice quantum field theories.” *Proceedings of Science*, vol. 66, Jan. 2008.

Cecile, D. J., and Shailesh Chandrasekharan. “Sigma-resonance and convergence of chiral perturbation theory.” *Pos*, vol. LATTICE2008, 2008.

Chandrasekharan, Shailesh, and Abhijit C. Mehta. “Effects of the anomaly on the two-flavor QCD chiral phase transition.” *Physical Review Letters*, vol. 99, no. 14, Oct. 2007, p. 142004. *Epmc*, doi:10.1103/physrevlett.99.142004.
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