Spatio-temporal dynamics of shift current quantum pumping by femtosecond light pulse

Abstract

Shift current---a photocurrent induced by light irradiating noncentrosymmetric materials in the absence of any bias voltage or built-in electric field---is one of the mechanisms of the so-called bulk photovoltaic effect. It has been traditionally described as a nonlinear optical response of periodic solids to continuous wave light using a perturbative formula, which is linear in the intensity of light and which involves Berry connection describing the shift in the center of mass position of the Wannier wave function associated with the transition between the valence and conduction bands. We analyze realistic two-terminal devices, where paradigmatic Rice-Mele model is sandwiched between two metallic electrodes, using recently developed time-dependent nonequilibrium Green function algorithms scaling linearly in the number of time steps and capable of treating nonperturbative effects in the amplitude of external time-dependent fields. This unveils novel features: superballistic transport, signified by time dependence of the displacement, $\sim t^{\nu }$ with $\nu >1$, of the photoexcited charge carriers from the region where the femtosecond light pulse is applied toward the electrodes; and photocurrent quadratic in light intensity at subgap frequencies of light due to two-photon absorption processes that were missed in previous perturbative analyses. Furthermore, frequency dependence of the DC component of the photocurrent reveals shift currents as a realization of nonadiabatic quantum charge pumping enabled by breaking of left-right symmetry of the device structure. This demonstrates that a much wider class of systems, than the usually considered polar noncentrosymmetric bulk materials, can be exploited to generate nonzero DC component of photocurrent in response to unpolarized light and optimize shift-current-based solar cells and optoelectronic devices.

arXiv comment8 pages, 6 figures, PDFLaTeX; two additional movies, depicting spatial profiles of local shift current in clean and disordered systems during application of fs light pulse, are available from https://wiki.physics.udel.edu/qttg/Publications

References in corpus (27)

• Two-Dimensional Material Nanophotonics
• Decoherence, the measurement problem, and interpretations of quantum mechanics
• First principles calculations of the Shift Current Bulk Photovoltaic Effect in Ferroelectrics
• Topological nature of nonlinear optical effects in solids
• Floquet scattering theory of quantum pumps
• Direct optical detection of Weyl fermion chirality in a topological semimetal
• Colossal Bulk Photovoltaic Effect in a Weyl Semimetal
• Electrically switchable Berry curvature dipole in the monolayer topological insulator WTe2
• Design principles for shift current photovoltaics
• Large bulk photovoltaic effect and spontaneous polarization of single-layer monochalcogenides
• Limits of quantum speedup in photosynthetic light harvesting
• Imaging mesoscopic spin Hall flow: Spatial distribution of local spin currents and spin densities in and out of multiterminal spin-orbit coupled semiconductor nanostructures
• Mono-parametric quantum charge pumping: interplay between spatial interference and photon-assisted tunneling
• Charge Pumping and Photovoltaic effect in Open Quantum Dots
• Numerical simulations of time resolved quantum electronics
• Photogalvanic Effect in Weyl Semimetals from First Principles
• Enhancement of bulk photovoltaic effect in topological insulators
• Quantitative relationship between polarization differences and the zone-averaged shift photocurrent
• Photogalvanic Effects in Heteropolar Nanotubes
• Propagation Scheme for Non-Equilibrium Dynamics of Electron Transport in Nanoscale Devices
• Electron density and transport in top-gated graphene nanoribbon devices: First-principles Green function algorithms for systems containing large number of atoms
• Quantum kinetic theory of shift current electron pumping in semiconductors
• Spin and charge pumping in magnetic tunnel junctions with precessing magnetization: A nonequilibrium Green function approach
• Charge pumping by magnetization dynamics in magnetic and semi-magnetic tunnel junctions with interfacial Rashba or bulk extrinsic spin-orbit couplings
• Local photo-excitation of shift current in noncentrosymmetric systems
• All-optically induced ultrafast photocurrents: Beyond the instantaneous coherent response
• Controlling ultrafast currents by the non-linear photogalvanic effect

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