Quantum kinetic theory of two-beam current injection in bulk semiconductors

Sipe, J. E.

doi:10.1103/physrevb.61.5381

Cited by 28 publications

(45 citation statements)

References 39 publications

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“…GaAs [2,3,13]) and since the effects calculated for carbon nanotubes are strongest for semiconducting tubes, it is appropriate to compare these effects. We find that the predicted effects are significantly stronger in nanotubes than for conventional semiconductors.…”

Section: Discussionmentioning

confidence: 99%

Coherent control of photocurrents in graphene and carbon nanotubes

Mele

Tománek

2000

Phys. Rev. B

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Coherent one photon (2ω) and two photon (ω) electronic excitations are studied for graphene sheets and for carbon nanotubes using a long wavelength theory for the low energy electronic states. For graphene sheets we find that coherent superposition of these excitations produces a polar asymmetry in the momentum space distribution of the excited carriers with an angular dependence which depends on the relative polarization and phases of the incident fields. For semiconducting nanotubes we find a similar effect which depends on the square of the semiconducting gap, and we calculate its frequency dependence. We find that the third order nonlinearity which controls the direction of the photocurrent is robust for semiconducting tubes and vanishes in the continuum theory for conducting tubes. We calculate corrections to these results arising from higher order crystal field effects on the band structure and briefly discuss some applications of the theory.

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Section: Discussionmentioning

confidence: 99%

Coherent control of photocurrents in graphene and carbon nanotubes

Mele

Tománek

2000

Phys. Rev. B

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“…The current injection discussed here can be used as a source term in hydrodynamic equations that treat the scattering phenomenologically 11,56,57 or in microscopic transport equations. 58 Coulomb effects other than the excitonic effects we consider here play a role in scattering, especially at high densities of excited carriers. Such Coulomb effects are outside the scope of this paper.…”

Section: Preliminariesmentioning

confidence: 99%

Excitonic effects on the two-color coherent control of interband transitions in bulk semiconductors

Bhat

Sipe

2005

Phys. Rev. B

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Quantum interference between one-and two-photon absorption pathways allows coherent control of interband transitions in unbiased bulk semiconductors; carrier population, carrier spin polarization, photocurrent injection, and spin current injection may all be controlled. We extend the theory of these processes to include the electron-hole interaction. Our focus is on photon energies that excite carriers above the band edge, but close enough to it so that transition amplitudes based on low order expansions in k are applicable; both allowed-allowed and allowed-forbidden two-photon transition amplitudes are included. Analytic solutions are obtained using the effective mass theory of Wannier excitons; degenerate bands are accounted for, but envelope-hole coupling is neglected. We find a Coulomb enhancement of two-color coherent control process, and relate it to the Coulomb enhancements of one-and two-photon absorption. In addition, we find a frequency dependent phase shift in the dependence of photocurrent and spin current on the optical phases.The phase shift decreases monotonically from π/2 at the band edge to 0 over an energy range governed by the exciton binding energy. It is the difference between the partial wave phase shifts of the electron-hole envelope function reached by one-and two-photon pathways.

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“…They re-derived the three second-order photocurrents in easier manner compared to previous approaches [35,37,38]. In particular, the expression of shift current for a general gauge vector A is:…”

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confidence: 99%

Shift charge and spin photocurrents in Dirac surface states of topological insulator

2017

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The generation of photocurrent in condensed matter is of main interest for photovoltaic and optoelectonic applications. Shift current, a nonlinear photoresponse, has attracted recent intensive attention as a dominant player of bulk photovoltaic effect in ferroelectric materials. In three dimensional topological insulators Bi2X3 (X: Te, Se), we find that Dirac surface states with a hexagonal warping term carry shift current by linearly polarized light. In addition, shift spin-current is introduced with the time-reversal symmetry breaking perturbation. The estimate for the magnitudes of the shift charge-and spin-currents are 0.13I0 and 0.21I0(nA/m) with the intensity of light I0 measured in (W/m 2 ), respectively, which can offer a useful method to generate these currents efficiently.Introduction and background-Interaction of light with topological matters has drawn keen attention in condensed matter community. Not only the characterization of topological matter has been done by light-assisted experimental tools that probe electronic bands [1][2][3]

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Quantum kinetic theory of two-beam current injection in bulk semiconductors

Cited by 28 publications

References 39 publications

Coherent control of photocurrents in graphene and carbon nanotubes

Coherent control of photocurrents in graphene and carbon nanotubes

Excitonic effects on the two-color coherent control of interband transitions in bulk semiconductors

Shift charge and spin photocurrents in Dirac surface states of topological insulator

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