Ajit Srivastava

Assistant Professor

Office: MSC - RM N212

Phone: 404-727-8813

Email: ajit.srivastava@emory.edu

Additional Contact Information

Mailing Address:

400 Dowman Drive
MSC - RM N212

Atlanta, GA 30322-2430

Additional Websites

Education

  • Ph.D., Rice University, 2009

Research

Research Area

Condensed matter physics, quantum optics, strong light-matter interactions, physics of atomically thin 2D materials, role of geometry and topology in low-dimensions, Berry phase and artificial gauge fields, open systems.

Research Interests

In our lab, we study the electronic and optical properties of novel atomically thin materials. Often novel physical phenomena arise when the dimensionality is reduced. For example, electrons in two-dimensions can exhibit a fractional charge. Using light as the main tool, we perform experiments to investigate the physics of low-dimensional materials with a goal towards control and manipulation of charge carriers and their internal degrees of freedom such as charge, spin and pseudo- spin. Some of the techniques used in our lab are nanoscale fabrication, magneto- optical spectroscopy, photon correlations, and electrical transport.

A closely related theme is to understand the role of geometry and topology in solid- state using light-matter interactions. A non-trivial geometry of electronic bands (wave-functions) in a solid can result in effective electromagnetic fields in the reciprocal space. Can we use light to tune such fields? Is it possible to induce non- trivial geometry and topological states of light/matter using light-matter interactions? Our research hopes to address these questions.

Publications

“Signatures of Bloch-band geometry on excitons: Nonhydrogenic spectra in transition-metal dichalcogenides”, A. Srivastava and A. Imamoglu, Phys. Rev. Lett. 115, 166802 (2015).

“Valley Zeeman effect in elementary optical excitations of monolayer WSe2”, A. Srivastava, M. Sidler, A.V. Allain, D. S. Lembke, A. Kis, A. Imamoglu, Nature Phys. 11, 141-147 (2015).

“Optically active quantum dots in monolayer WSe2”, A. Srivastava, M. Sidler, A.V. Allain, D. S. Lembke, A. Kis, A. Imamoglu, Nature Nanotech. 10, 491-496 (2015).

"Hyperfine Interaction-Dominated Dynamics of Nuclear Spins in Self-Assembled InGaAs Quantum Dots", C. Latta, A.Srivastava & A. Imamoglu, Phys. Rev. Lett. 107, 167401 (2011).

“Direct observation of dark excitons in individual carbon nanotubes: Inhomogeneity in the exchange splitting”, A. Srivastava, H. Htoon, V.I. Klimov, J. Kono
Phys. Rev. Lett. 101, 087402 (2008).

“Laser-induced above-band-gap transparency in GaAs”, A. Srivastava, R. Srivastava, J. Wang, J. Kono, Phys. Rev. Lett. 93, 157401 (2004).