“Circular” Photogalvanic Effect in Optically Active Crystals

Asnin, V. M.; Bakun, A. A.; Danishevskii, A. M.; Ivchenko, E. L.; Pikus, G. E.; Рогачев, А. А.

doi:10.1007/978-3-642-81398-6_18

Cited by 25 publications

(35 citation statements)

References 2 publications

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“…Our results show that in this case, because the classical CacHE is substantially diminished, much finer effects, such as the circular photogalvanic effect (CPGE), well known for noncentrosymmetric bulk and low-dimensional semiconductors, 14,[16][17][18][19] become measurable. We present a phenomenological and microscopic theory of photocurrents in graphene and show that the experimental proof of the interplay of CacHE and CPGE of comparable strength comes from the spectral behavior of the photocurrent.…”

Section: Introductionmentioning

confidence: 72%

Helicity-dependent photocurrents in graphene layers excited by midinfrared radiation of a CO2laser

et al. 2011

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We report the study of the helicity-driven photocurrents in graphene excited by midinfrared light of a CO 2 laser. Illuminating an unbiased monolayer sheet of graphene with circularly polarized radiation generatesunder oblique incidence-an electric current perpendicular to the plane of incidence, whose sign is reversed by switching the radiation helicity. We show that the current is caused by the interplay of the circular ac Hall effect and the circular photogalvanic effect. By studying the frequency dependence of the current in graphene layers grown on the SiC substrate, we observe that the current exhibits a resonance at frequencies matching the longitudinal optical phonon in SiC.

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Section: Introductionmentioning

confidence: 72%

Helicity-dependent photocurrents in graphene layers excited by midinfrared radiation of a CO2laser

et al. 2011

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“…The current here is caused by the difference in spin-flip scattering rates for electrons with different spin states in some systems with broken inversion symmetry. A comprehensive survey of the related effects, from the circular photogalvanic effect (Asnin et al, 1979) to recent demonstrations in semiconductor quantum wells 25 For example, studies probing the spin-charge separation in the non-Fermi liquids have been proposed by Kivelson and Rokhsar (1990); Zhao and Hershfield (1995); Si (1997Si ( , 1998; Egger (2000, 2001). Spin and charge are carried by separate excitations and can lead to spatially separated spin and charge currents (Kivelson and Rokhsar, 1990).…”

Section: A Introductionmentioning

confidence: 99%

Spintronics: Fundamentals and applications

2004

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Spintronics, or spin electronics, involves the study of active control and manipulation of spin degrees of freedom in solid-state systems. This article reviews the current status of this subject, including both recent advances and well-established results. The primary focus is on the basic physical principles underlying the generation of carrier spin polarization, spin dynamics, and spin-polarized transport in semiconductors and metals. Spin transport differs from charge transport in that spin is a nonconserved quantity in solids due to spin-orbit and hyperfine coupling. The authors discuss in detail spin decoherence mechanisms in metals and semiconductors. Various theories of spin injection and spin-polarized transport are applied to hybrid structures relevant to spin-based devices and fundamental studies of materials properties. Experimental work is reviewed with the emphasis on projected applications, in which external electric and magnetic fields and illumination by light will be used to control spin and charge dynamics to create new functionalities not feasible or ineffective with conventional electronics. CONTENTS

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“…[2,3] and observed for the first time on a bulk tellurium crystal in Ref. [4] and on a quantum-well structure GaAs/AlGaAs in [5,6].…”

Section: Introductionmentioning

confidence: 99%

Photocurrent in gyrotropic Weyl semimetals

2017

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We present results of a theoretical study of photocurrents in the Weyl semimetals belonging to the gyrotropic symmetry classes. We show that, in weakly gyrotropic symmetry classes Cnv (n = 3, 4, 6), the circular photocurrent transverse to the incidence direction appears only with account, in the electron effective Hamiltonian, for both linear and quadratic or cubic in quasi-momentum spindependent terms as well as a spin-independent term resulting in the tilt of the cone dispersion. A polarization-independent magneto-induced photocurrent is predicted which is also allowed in gyrotropic systems only. For crystals of the C2v symmetry, we consider a microscopic mechanism of the photocurrent in a quantized magnetic field which is generated under direct optical transitions between the ground and the first excited magnetic subbands. It is shown that this current becomes nonzero with allowance for anisotropic tilt of the dispersion cones.

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“Circular” Photogalvanic Effect in Optically Active Crystals

Cited by 25 publications

References 2 publications

Helicity-dependent photocurrents in graphene layers excited by midinfrared radiation of a CO2laser

Helicity-dependent photocurrents in graphene layers excited by midinfrared radiation of a CO2laser

Spintronics: Fundamentals and applications

Photocurrent in gyrotropic Weyl semimetals

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