Output polarization characteristics of a GaN microcavity diode polariton laser

Bhattacharya, Aniruddha; Baten, Zunaid; Iorsh, I. V.; Frost, Thomas; Kavokin, A. V.; Bhattacharya, P.

doi:10.1103/physrevb.94.035203

Cited by 17 publications

(14 citation statements)

References 52 publications

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“…[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].…”

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“…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].…”

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confidence: 99%

“…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. First, the regular n-type ohmic contact is replaced by n-type FeCo/MgO spin-injector contacts to introduce a net electron spin 4 imbalance in the laser diode.…”

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Room-Temperature Spin Polariton Diode Laser

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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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“…The supercell size is kept 25 Å to prevent the interaction between the adjacent periodic images of the nanocluster. Further, we have employed ab initio atomistic thermodynamics to identify thermodynamically the most favorable configuration/structure at ambient conditions (T=300K, po = 1atm) [33][34][35][36]. The size of the nanocluster (used in our simulations) is taken considering the thickness of the films as in our experiment.…”

Section: Theoretical Methodologymentioning

confidence: 99%

Oxygen vacancy mediated cubic phase stabilization at room temperature in pure nano-crystalline zirconia films: a combined experimental and first-principles based investigation

Kalita

Saini

Rajput

et al. 2019

Phys. Chem. Chem. Phys.

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We report the formation of cubic phase, under ambient conditions, in thin films of Zirconia synthesized by electron beam evaporation technique. The stabilization of the cubic phase was achieved without the use of chemical stabilizers and/or concurrent ion beam bombardment. Films of two different thickness (660 nm, 140 nm) were deposited. The 660 nm and 140 nm films were found to be stoichiometric (ZrO2) and off-stoichiometric (ZrO1.7) respectively by Resonant Rutherford back-scattering spectroscopy. While the 660 nm as-deposited films were in the cubic phase, as indicated by X-ray diffraction and Raman spectroscopy measurements, the 140 nm asdeposited films were amorphous and the transformation to cubic phase was obtained after thermal annealing. Extended X-ray absorption fine structure measurements revealed the existence of Oxygen vacancies in the local structure surrounding Zirconium for all films. However, the amount of these Oxygen vacancies was found to be significantly higher for the amorphous films as compared to the films in the cubic phase (both 660 nm as-deposited and 140 nm annealed films).The cubic phase stabilization is explained on the basis of suppression of the soft X2mode of vibration of the Oxygen sub-lattice due to the presence of the Oxygen vacancies. Our firstprinciples modeling under the framework of density functional theory shows that the cubic structure with Oxygen vacancies is indeed more stable at ambient conditions than its pristine (without vacancies) counterpart. The requirement of a critical amount of these vacancies for the stabilization of the cubic phase is also discussed.

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“…Banerjee and Majhi [30] studied the Hawking radiation process by using quantum tunneling phenomenon at horizons and investigated the back-reaction effects. The quantum tunneling spectrum for scalar and fermion particles has also been discussed in literature [31]- [35].…”

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Fermions Tunneling and Quantum Corrections for Quintessential Kerr-Newman-AdS Black Hole

Javed

Babar

2019

Advances in High Energy Physics

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This paper is devoted to study charged fermion particles tunneling through the horizon of Kerr-Newman-AdS black hole surrounded by quintessence by using Hamilton-Jacobi ansatz. In our analysis, we investigate Hawking temperature as well as quantum corrected Hawking temperature on account of generalized uncertainty principle. Moreover, we discuss the effects of correction parameter β on the corrected Hawking temperature T e−H , graphically. We conclude that the temperature T e−H vanishes when β = 100, whereas for β < 100 and β > 100, the temperature turns out to be positive and negative, respectively. We observe that the graphs of T e−H w.r.t. quintessence parameter α exhibit behavior only for the particular ranges, i.e., 0 < α < 1/6, charge 0 < Q ≤ 1 and rotation parameter 0 < a ≤ 1. For smaller and larger values of negative Λ, as horizon increases, the temperature decreases and increases, respectively.

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Output polarization characteristics of a GaN microcavity diode polariton laser

Cited by 17 publications

References 52 publications

Room-Temperature Spin Polariton Diode Laser

Room-Temperature Spin Polariton Diode Laser

Oxygen vacancy mediated cubic phase stabilization at room temperature in pure nano-crystalline zirconia films: a combined experimental and first-principles based investigation

Fermions Tunneling and Quantum Corrections for Quintessential Kerr-Newman-AdS Black Hole

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