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Articles by Pankaj Bhalla
Condensed Matter > Mesoscale and Nanoscale Physics
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Condensed Matter > Mesoscale and Nanoscale Physics
The photon-drag effect is a nonlinear optical phenomenon in which the finite momentum carried by incident photons is transferred to charge carriers, thereby generating a dc photocurrent even in systems with inversion symmetry. Within the density-matrix formalism in the velocity gauge, and accounting for nonvertical optical transitions driven by finite photon momentum, we derive the nonlinear injection and shift conductivities that characterize the photon-drag photogalvanic response.
Disorder Induced Dynamical Interband Response in Dirac Nodal Line Semimetals
Data Availability Statement The data that support the findings of this study are available from the corresponding author upon reasonable request.
Disorder Induced Dynamical Interband Response in Dirac Nodal Line Semimetals
Conflict of Interest The authors declare no conflict of interest. Data Availability Statement The data that support the findings of this study are available from the corresponding author upon reasonable request. References 1, , , Phys. Rev. B 2011, 84, 235126. 2, , , , , , , , , , , , , , , , , , , , , , , , Nat. Commun. 2016, 7, 1. 3, , , , , , Adv. Phys.: X 2018, 3, 1414631. 4, , , , , , , , , , , , , , , , , Phys. Rev. B 2016, 93, 121113. 5, , , , Phys. Rev. B 2015, 92, 081201. 6, , , , , Phys. Rev. Lett.
Quantum kinetic theory of nonlinear thermal current
Abstract We investigate the second-order nonlinear electronic thermal transport induced by the temperature gradient. We develop the quantum kinetic theory framework to describe thermal transport in the presence of a temperature gradient. Using this, we predict an intrinsic scattering time-independent nonlinear thermal current in addition to the known extrinsic nonlinear Drude and Berry curvature dipole contributions.
Quantum kinetic theory of nonlinear optical currents: Finite Fermi surface and Fermi sea contributions
Abstract The quantum kinetic framework provides a versatile method for investigating the dynamical optical and transport currents of crystalline solids. In this paper, starting from the density-matrix equations of motion, we present a general theoretical path to obtain the nonlinear optical response in an elegant and transparent manner.
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