Modulation bandwidth of a spin laser

Banerjee, Debashree; Adari, R.; Murthy, M.S.S.; Suggisetti, P.; Ganguly, Swaroop; Saha, D.

doi:10.1063/1.3556959

Cited by 16 publications

(14 citation statements)

References 15 publications

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“…The progress in fast magnetization reversal could stimulate implementing all-electrical schemes for spin modulation in lasers that were shown to yield an enhanced bandwidth in lasers. 12,16,25,26,29,85,86 |CB ⇑ (⇓) = |1/2, 1/2 (−1/2) |HH ⇑ (⇓) = |3/2, 3/2 (−3/2) |LH ⇑ (⇓) = |3/2, 1/2 (−1/2) |SO ⇑ (⇓) = |1/2, 1/2 (−1/2) .…”

Section: Discussionmentioning

confidence: 99%

Toward high-frequency operation of spin lasers

Faria

Lee

et al. 2015

Phys. Rev. B

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Injecting spin-polarized carriers into semiconductor lasers provides important opportunities to extend what is known about spintronic devices, as well as to overcome many limitations of conventional (spin-unpolarized) lasers. By developing a microscopic model of spin-dependent optical gain derived from an accurate electronic structure in a quantum well-based laser, we study how its operation properties can be modified by spin-polarized carriers, carrier density, and resonant cavity design. We reveal that by applying an uniaxial strain it is possible to attain a large birefringence. While such birefringence is viewed as detrimental in conventional lasers, it could enable fast polarization oscillations of the emitted light in spin-lasers which can be exploited for optical communication and high-performance interconnects. The resulting oscillation frequency (> 200 GHz) would significantly exceed the frequency range possible in conventional lasers.

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Section: Discussionmentioning

confidence: 99%

Toward high-frequency operation of spin lasers

Faria

Lee

et al. 2015

Phys. Rev. B

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“…Through the angular momentum transfer, the injection of spin-polarized carriers leads to a stimulated emission of circularly polarized light [28][29][30][31]. Spin lasers offer an improved performance, such as a threshold reduction for lasing, an enhanced bandwidth, and reduced parasitic frequency modulation, as compared to their conventional (spin-unpolarized) counterparts [32][33][34][35][36][37][38][39][40].…”

Section: Introductionmentioning

confidence: 99%

Graphene spintronics: Spin injection and proximity effects from first principles

et al. 2014

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Ferromagnet/graphene (F/Gr) junctions are important building blocks for graphene spintronics. While simple models of spin injection are very successful for macroscopic metallic junctions, they reveal many deficiencies in describing F/Gr junctions. First-principles methods are key to assess such Gr-based junctions, but the computational cost is often too high. We focus on Ni(111)/Gr junctions and include van der Waals interactions from first principles, crucial for their correct description. We formulate a computationally inexpensive model to examine the nonuniformity and bias dependence of spin injection and elucidate proximity effects using spin polarization maps. Our results could extend the applicability of simple spin injection models in F/Gr junctions.

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“…Such a device with controllable output circular polarization is useful for the study of fibrous proteins, collagens and asymmetric photochemical reactions which are sensitive to circularly polarized light. Information can be encoded onto both the intensity as well as the polarization of light in an optical communication system, thus effectively doubling the bandwidth of communication channels [27,30]. There have been several reports of excitonpolariton spintronic switches [31,32] and circularly polarized polariton lasers [5,[12][13][14]33].…”

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confidence: 99%

Room-Temperature Spin Polariton Diode Laser

et al. 2017

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2The output of a microcavity coherent light source is generally linearly polarized in the emitter-cavity photon strong coupling regime in the absence of pinning caused by photonic structural disorders [1][2][3]. However, it has been experimentally demonstrated that the orientation of this polarization is stochastic and hence the polarization cannot be experimentally recorded in the steady state [4,5]. Linear polarization can be observed in the steady state output only by pinning along a preferred crystallographic axis [6][7][8][9][10] and the degree of polarization decreases at high pumping levels due to the depinning effect caused by polariton-polariton repulsive interactions and self-induced Larmor precession of the Stokes vector of the condensate [11].These trends in the linear polarization have been observed in polariton lasers pumped optically[9] and electrically [10]. In the case of optical excitation, it is also possible to obtain a circularly polarized output above threshold and this behavior has been verified experimentally in the steady state at cryogenic temperatures [12][13][14][15]. The degree of circular polarization is determined by the interplay of polariton thermalization by scattering (polariton-phonon, polariton-electron and polariton-polariton) and polariton pseudospin precession in the effective magnetic field due to the TE-TM splitting [2,16]. Circular polarization has not been observed in the output of an electrically injected polariton laser since carriers are injected with no net polarization [17]. The output can be circularly polarized due to the interplay of spin-dependent polariton-polariton interactions and stimulated relaxation of exciton polaritons at high injection densities where the depinning of linear polarization is observed [9], but this circular polarization is small, random and largely uncontrolled. On the other hand, it is possible to obtain a controlled and variable circularly polarized output by electrically injecting spin polarized carriers with a suitable ferromagnetic contact [20,21] based on a pump and probe scheme in a semiconductor microcavity, wherein a localized trigger switches on a large pump area and thus controls the polarization of the full emission [31]. In all these previous reports, the devices have been optically excited and their operation was limited to cryogenic temperatures. We demonstrate here, for the first time, modulation of circular polarization of the output of a GaN-based polariton laser at room temperature by electrical injection of spin-polarized electrons using a FeCo/MgO tunnel spin injector contact.We have characterized several identical electrically pumped bulk GaN-based microcavity polariton lasers fabricated from a single epitaxially grown heterostructure sample schematically shown in Fig. 1(a). Device fabrication is described in the Supplemental Material [34]. Two significant changes are incorporated in our previously reported [10,[35][36][37] polariton laser diodes to accomplish successful electrical spin injection and transport. Fi...

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Modulation bandwidth of a spin laser

Cited by 16 publications

References 15 publications

Toward high-frequency operation of spin lasers

Toward high-frequency operation of spin lasers

Graphene spintronics: Spin injection and proximity effects from first principles

Room-Temperature Spin Polariton Diode Laser

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