Photoinduced spin-polarized current in InSb-based structures

Frazier, Matthew; Cates, Jonathan G.; Waugh, Justin; Heremans, J. J.; Santos, M. B.; Liu, Xifan; Khodaparast, Giti A.

doi:10.1063/1.3262496

Cited by 15 publications

(16 citation statements)

References 22 publications

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“…It is necessary to mention that in [12] and [13], the origin of the observed helicity-dependent photoinduced currents in centrosymmetric strain-free InSb crystal and a porous gold film, respectively, has not been explained. In contrast, our theoretical and experimental results suggests that CPDE does explain the light-induced surface current in highly conductive porous films.…”

Section: Discussionmentioning

confidence: 99%

“…The CPDE manifests itself as a helicity-dependent current propagating perpendicular to the plane of incidence. It was observed at oblique incidence in quantum wells [3], graphene [6, 26], InSb [12] and bulk tellurium [27]. At the nanosecond excitation, the CPDE has been recently observed in nanoporous gold thin film [13], 2D metallic photonic crystal slabs [28] and Ag/Pd nanocomposite [14, 29, 30].…”

Section: Introductionmentioning

confidence: 99%

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Femtosecond Circular Photon Drag Effect in the Ag/Pd Nanocomposite

et al. 2017

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We report on the observation of the helicity-dependent photoresponse of the 20-μm-thick silver–palladium (Ag/Pd) nanocomposite films. In the experiment, 120 fs pulses of Ti:S laser induced in the film an electric current perpendicular to the incidence plane. The photoinduced current is a linear function of the incident beam power, and its sign depends on the beam polarization and angle of incidence. In particular, the current is zero for the p- and s-polarized beams, while its sign is opposite for the right- and left-circularly polarized beams. By comparing experimental results with theoretical analysis, we show that the photoresponse of the Ag/Pd nanocomposite originates from the photon drag effect.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Femtosecond Circular Photon Drag Effect in the Ag/Pd Nanocomposite

et al. 2017

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“…Here we report the generation of spin polarized currents in n-type InSb QWs [11] via the circular photo-galvanic effect (CPGE) [12][13][14][15] . A simplified picture of CPGE to generate spin-polarized current is presented in Fig.…”

Section: Spin Polarized Current In Insb Qwsmentioning

confidence: 99%

Probe of coherent and quantum states in narrow-gap semiconductors in the presence of strong spin-orbit coupling

et al. 2010

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In light of the growing interest in spin-related phenomena and devices, there is now a renewed interest in the science and engineering of narrow gap semiconductors. They offer several scientifically unique electronic features such as a small effective mass, a large g-factor, a high intrinsic mobility, and large spin-orbit coupling effects. Our studies have been focused on probing and controlling the coherent and quantum states in InSb quantum wells and InMnAs ferromagnetic semiconductors. Our observations are providing new information regarding the optical control of carriers and spins in these material systems. We demonstrated the generation of spin polarized photo-current in an InSb QW where a non-equilibrium spin population has been achieved by using circularly polarized radiation. In addition, the differential transmission measurements in InSb QWs demonstrated that the initial distribution function strongly influences the carrier relaxation dynamics. We employed the polarization-resolved differential transmission as well as the MOKE measurements to provide information on the spin relaxation dynamics in MOVPE grown InMnAs. Our measured T 1 is comparable to the reported measurements in MBE grown InMnAs and several time resolved measurements on InAs.

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“…Compared to GaMnAs [5], NGFS have smaller band gaps, larger g-factors and spin-orbit coupling [6,7], and much higher electron and hole mobilities. The narrow gap materials are also more interesting and difficult to treat theoretically since there is strong band-mixing between the conduction and valence bands, unlike GaAs where the conduction and valence bands can be treated separately [8,9].…”

Section: Introductionmentioning

confidence: 99%

High-field magnetic circular dichroism in ferromagnetic InMnSb and InMnAs: Spin-orbit-split hole bands andgfactors

et al. 2015

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Carrier-induced ferromagnetism in magnetic III-V semiconductors has opened up several opportunities for spintronic device applications as well as for fundamental studies of a material system in which itinerant carriers interact with the localized spins of magnetic impurities. In order to understand the hole mediated ferromagnetism, probing the band structure in these material systems is crucial. Here we present magnetic circular dichroism (MCD) studies on MOVPE grown InMnSb and InMnAs, both with the Curie temperatures above 300 K. The measurements were performed on samples with different Mn contents with the excitation energy tuned from 0.92-1.42 eV and external magnetic fields up to 31 Tesla. The large g-factors in these systems allow us to measure the MCD at relatively high temperatures (190 K). These measurements are compared with MCD calculations based on an 8 band Pidgeon-Brown model which is generalized to include the coupling between the electron/hole and the Mn spin in a ferromagnetic state. Comparison of the observed MCD with the theoretical calculations provides a direct method to probe the band structure including the temperature dependence of the spin-orbit split-off gap and g-factors, and to estimate the sp-d coupling constants.

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Photoinduced spin-polarized current in InSb-based structures

Cited by 15 publications

References 22 publications

Femtosecond Circular Photon Drag Effect in the Ag/Pd Nanocomposite

Femtosecond Circular Photon Drag Effect in the Ag/Pd Nanocomposite

Probe of coherent and quantum states in narrow-gap semiconductors in the presence of strong spin-orbit coupling

High-field magnetic circular dichroism in ferromagnetic InMnSb and InMnAs: Spin-orbit-split hole bands andgfactors

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