Theoretical Condensed Matter Physics

Theoretical Condensed Matter Physics at Northwestern is headed by faculty pursuing fundamental research ranging from foundations of quantum mechanics, quantum theory of matter and fields, quantum phase transitions to condensed matter realizations of quantum simulators and quantum devices for quantum information processing, storage and computation.
Anupam Garg

Professor
PhD, Cornell University
garg@northwestern.edu
webpage
Anupam Garg's current research centers around quantum phenomena involving the orientational degree of freedom of spin angular momentum. Current projects include the formalism of spin coherent-state path integrals and spin semiclassics, and the collective relaxational dynamics of spins in molecular solids of single-molecule magnets.

Selected Publications:

Weyl-Wigner-Moyal Formalism for Spin, Feifei Li, Carol Braun, and Anupam Garg, Europhys. Lett. 102, 60006 (2013) [doi].

Low Temperature Magnetization Dynamics of Molecular Solids in a Swept Field, Eric Lenferink, Avinash Vijayaraghavan, and Anupam Garg, Ann. Phy. 356, 37-56 (2015) [doi].

Jens Koch

Assistant Professor
PhD, Freie Universität Berlin
jens-koch@northwestern.edu
webpage
Jens Koch's research currently focuses on the theory of interacting photons in circuit QED arrays, their nonequilibrium steady-states, dissipative phase transitions, open-system quantum simulation, and on new mechanisms for enhancing quantum coherence in superconducting qubits by intrinsic quantum error protection.

Selected Publications:

On-chip quantum simulation with superconducting circuits, A. A. Houck, H. E. Türeci, and J. Koch, Nature Phys. 8, 292–299 (2012) [doi].

Perturbative approach to Markovian open quantum systems Andy C. Y. Li, F. Petruccione and Jens Koch, Sci. Rep. 4, 4887 (2014) [doi].

James Sauls

Professor
PhD, SUNY Stony Brook
sauls@northwestern.edu
webpage
James Sauls' research is focussed on investigation of phases of condensed matter that derive from spontaneous symmetry breaking and topological order, including topological phases of superfluid 3He and unconventional superconductors. Sauls' research group is working towards an understanding of transport via edge and surface states of topological superconductors and superfluid 3He.

Selected Publications: [arxiv]

Electron bubbles and Weyl Fermions in chiral superfluid 3He-A Phys. Rev. B, 94, 064511 (2016), Oleksii Shevtsov and J. A. Sauls [doi].

Anisotropy & Strong-Coupling Effects on the Collective Mode Spectrum of Chiral Superconductors: Application to Sr2RuO4. Frontiers in Physics, 3:36, 2015, J. A. Sauls, Hao Wu, & Suk Bum Chung [doi].

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