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Confinement-induced Berry phase and helicity-dependent photocurrents · Around

2009

Confinement-induced Berry phase and helicity-dependent photocurrents

Moore, J. E., Orenstein, J.

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The photocurrent in an optically active metal is known to contain a component that switches sign with the helicity of the incident radiation.

At low frequencies, this current depends on the orbital Berry phase of the Bloch electrons via the "anomalous velocity" of Karplus and Luttinger.
We consider quantum wells in which the parent material, such as GaAs, is not optically active and the relevant Berry phase only arises as a result of quantum confinement.
Using an envelope approximation that is supported by numerical tight-binding results, it is shown that the Berry phase contribution is determined for realistic wells by a cubic Berry phase intrinsic to the bulk material, the well width, and the well direction.

Built on

E. Deyo, L. E. Golub, E. L. Ivchenko, and B. Spivak, arXiv:0904.1917
Original
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R. Karplus and J. M. Luttinger, Phys. Rev. 95
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M. V. Berry, Proc. Roy. Soc. A 392
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M. S. Hybertsen and S. G. Louie, Phys. Rev. Lett. 55
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W. A. Harrison, Electronic structure and the properties of solids (Dover, New York, 1989), p. 54
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G. Bastard, Wave mechanics applied to semiconductor heterostructures (Editions de Physique, France, 1990)
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R. Resta, Ferroelectrics 136
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