Intraband relaxation via polaron decay in InAs self-assembled quantum dots

Zibik, E. A.; Wilson, L. R.; Green, R. P.; Bastard, G.; Ferreira, Robson; Phillips, P. J.; Carder, D.A.; Wells, J.‐P. R.; Cockburn, J. W.; Skolnick, M. S.; Steer, M. J.; Hopkinson, M.

doi:10.1103/physrevb.70.161305

Cited by 108 publications

(46 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It has been found that the splitting can be reproduced with a single reduced electron-hole effective mass µ * = 0.057±0.0005m 0 , the zerofield splitting δ = 5.5 ± 0.5 meV, and the energy E ∆ ranging from -4.35 meV to -2.6 meV [36]. The magnitude of the zero-field splitting agrees with the values of electronic p-shell splitting found in far-infrared experiments, being of the order of 5 meV [37,38] and a theoretical value (3 meV) for a similar lens-shaped dot [35]. Using the obtained values of reduced mass µ * and the zero-field splitting δ, as well as the confinement energyhω 0 = 31.3 meV one can describe the magnetic--field evolution of the p x -shell-related emission lines (see dotted line in Fig.…”

Section: Orbital Effects In Magnetic Fieldsupporting

confidence: 74%

Optical Spectroscopy of Quantum Dots in High Magnetic Fields

Babiński

2006

Acta Phys. Pol. A

View full text Add to dashboard Cite

Optical spectroscopy measurements of single InAs/GaAs self-assembled quantum dots have been performed. The multiexcitonic emission from the s-, p-, and d-shells of a single dot is observed and investigated in magnetic field up to 28 T. The Zeeman splitting of the s-shell excitons has been found to depend on the dot morphology. While the energy-splitting in flat (2 nm height) dots linearly increases with magnetic field, its significant non--linearity is observed for larger in size, tall (4 nm height) dots. The effect of magnetic field on the orbital motion of carriers in dots has also been investigated. It has been found that the modified Fock-Darwin pattern explains the observed evolution of the emission from highly-excited single tall quantum dot.

show abstract

Section: Orbital Effects In Magnetic Fieldsupporting

confidence: 74%

Optical Spectroscopy of Quantum Dots in High Magnetic Fields

Babiński

2006

Acta Phys. Pol. A

View full text Add to dashboard Cite

show abstract

“…This is the so called phonon bottleneck. Experimental results [10][11][12][13][14] from QBs and photocurrent-response/dark-current measurements from QB IR detectors [11,15] indicate electron-relaxation times of the order of 100 ps, in good agreement with theory [16]. As the temperature increases to RT the relaxation times decrease [12,13] due to the inherent carrier loss, in self-assembled QBs, to wetting layers [19].…”

Section: Iqb Lasers: Design and Projected Performancesupporting

confidence: 53%

“…That is, nonradiative processes are about 2300 times faster than radiative processes. Since there are good reasons to believe that the LO-phonon-assisted relaxation time will substantially increase if the relaxing electrons are confined in quantum boxes [7][8][9][10][11][12][13][14][15][16], the radiative efficiency problem can be overcome by replacing the QW active regions of a QC laser with a quantum-box (QB) 2-D array [17] or a 2-D array of cascaded QBs [18]. …”

Section: Introductionmentioning

confidence: 99%

Progress towards intersubband quantum-box lasers for highly efficient continuous wave operation in the mid-infrared

et al. 2009

View full text Add to dashboard Cite

Abstract. Intersubband quantum-box (IQB) lasers, which are devices consisting of 2-D arrays of ministacks (i.e., 2-4 stages) intersubband QB emitters have been proposed as alternatives to 30-stage quantum-cascade (QC) devices, for efficient room-temperature (RT) emission in the mid-infrared (4-6 µm) wavelength range. Preliminary results include: 1) the design of devices for operation with 50% wallplug efficiency at RT; 2) realization of a novel type of QC device: the deep-well (DW) QC laser, that has demonstrated at λ = 4.7 µm low temperature sensitivity of the threshold current, a clear indication of suppressed carrier leakage; 3) the formation of 2-D arrays at nanopoles by employing nanopatterning and dry etching; 4) the formation of 40 nm-diameter, one-stage IQB structures on 100 nm centers by preferential regrowth via metal-organic vapor phase epitaxy (MOVPE).

show abstract

“…The linear and isotropic acoustic phonon dispersion relation is assumed. The transition rate from an initial state to a final state is then given by [30] …”

Section: ) Interaction With Lo Phononsmentioning

confidence: 99%

Optically pumped intersublevel MidInfrared lasers based on InAs-GaAs quantum dots

Vukmirović

Ikonić

Jovanović

et al. 2005

IEEE J. Quantum Electron.

View full text Add to dashboard Cite

Abstract-We propose an optically pumped laser based on intersublevel transitions in InAs-GaAs pyramidal self-assembled quantum dots. A theoretical rate equations model of the laser is given in order to predict the dependence of the gain on pumping flux and temperature. The energy levels and wave functions were calculated using the 8-band method where the symmetry of the pyramid was exploited to reduce the computational complexity. Carrier dynamics in the laser were modeled by taking both electron-longitudinal optical phonon and electron-longitudinal acoustic phonon interactions into account. The proposed laser emits at 14.6 m with a gain of 570 cm 1 at the pumping flux 8=1 0 24 cm 2 s 1 and a temperature of =7 7K.By varying the size of the investigated dots, laser emission in the spectral range 13-21 m is predicted. In comparison to optically pumped lasers based on quantum wells, an advantage of the proposed type of laser is a lower pumping flux, due to the longer carrier lifetime in quantum dots, and also that both surface and edge emission are possible. The appropriate waveguide and cavity designs are presented, and by comparing the calculated values of the gain with the estimated losses, lasing is predicted even at room temperature for all the quantum dots investigated.Index Terms-Intraband transitions, mid-infrared, optically pumped lasers, quantum dots.

show abstract

Intraband relaxation via polaron decay in InAs self-assembled quantum dots

Cited by 108 publications

References 16 publications

Optical Spectroscopy of Quantum Dots in High Magnetic Fields

Optical Spectroscopy of Quantum Dots in High Magnetic Fields

Progress towards intersubband quantum-box lasers for highly efficient continuous wave operation in the mid-infrared

Optically pumped intersublevel MidInfrared lasers based on InAs-GaAs quantum dots

Contact Info

Product

Resources

About