Room temperature midinfrared electroluminescence from InAs quantum dots

Wasserman, D.; Ribaudo, Troy; Lyon, S. A.; Lyo, S. K.; Shaner, Eric A.

doi:10.1063/1.3080688

Cited by 29 publications

(22 citation statements)

References 20 publications

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“…Besides, the long-range efficiency amplification discussed in this paper could be possibly experimentally observed with, e.g., Rydberg atoms [30] or quantum dots [31][32][33][34][35] playing the role of the quantum emitters.…”

Section: Discussionmentioning

confidence: 98%

Excitation injector in an atomic chain: Long-range transport and efficiency amplification

et al. 2017

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We investigate the transport of energy in a linear chain of two-level quantum emitters ("atoms") weakly coupled to a blackbody radiation bath. We show that, simply by displacing one or more atoms from their regular-chain positions, the efficiency of the energy transport can be considerably amplified of at least one order of magnitude. Besides, in configurations providing an efficiency greater than 100% , the distance between the two last atoms of the chain can be up to 20 times larger than the one in the regular chain, thus achieving a much longer-range energy transport. By performing both a stationary and time-dependent analysis, we ascribe this effect to an elementary block of three atoms, playing the role of excitation injector from the blackbody bath to the extraction site. By considering chains with up to 7 atoms, we also show that the amplification is robust and can be further enhanced up to 1400%.

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Section: Discussionmentioning

confidence: 98%

Excitation injector in an atomic chain: Long-range transport and efficiency amplification

et al. 2017

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“…40,41 An essential part of the proposed structure in Ref. 41 is electron tunneling between QW and QD states.…”

Section: -20mentioning

confidence: 99%

“…40,41 An essential part of the proposed structure in Ref. 41 is electron tunneling between QW and QD states. The properties of related tunneling processes between localized and continuum states in self-organized QD structures have been separately investigated.…”

Section: -20mentioning

confidence: 99%

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Microscopic model for intersubband gain from electrically pumped quantum-dot structures

2014

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We study theoretically the performance of electrically pumped self-organized quantum dots as a gain material in the mid-IR range at room temperature. We analyze an AlGaAs/InGaAs based structure composed of dots-in-a-well sandwiched between two quantum wells. We numerically analyze a comprehensive model by combining a many-particle approach for electronic dynamics with a realistic modeling of the electronic states in the whole structure. We investigate the gain both for quasi-equilibrium conditions and current injection. Comparing different structures we find that steady-state gain can only be realized by an efficient extraction process, which prevents an accumulation of electrons in continuum states, that make the available scattering pathways through the quantum dot active region too fast to sustain inversion. The tradeoff between different extraction/injection pathways is discussed. Comparing the modal gain to a standard quantum-well structure as used in quantum cascade lasers, our calculations predict reduced threshold current densities of the quantum dot structure for comparable modal gain. Such a comparable modal gain can, however, only be achieved for an inhomogeneous broadening of a quantum-dot ensemble that is close to the lower limit achievable today using self-organized growth.

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“…Recently, much experimental progress in the direction of QD intersublevel devices has been made with mid-infrared (mid-IR) photodetectors [21][22][23]. While mid-IR electroluminescence at low temperatures [24][25][26], and also at room temperature [27,28] have been demonstrated, no QD-QCLs operating at room temperature have been realized so far.…”

Section: Introductionmentioning

confidence: 99%

Mid-Infrared Quantum-Dot Quantum Cascade Laser: A Theoretical Feasibility Study

2016

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Abstract:In the framework of a microscopic model for intersubband gain from electrically pumped quantum-dot structures we investigate electrically pumped quantum-dots as active material for a mid-infrared quantum cascade laser. Our previous calculations have indicated that these structures could operate with reduced threshold current densities while also achieving a modal gain comparable to that of quantum well active materials. Here, we study the influence of two important quantum-dot material parameters, namely inhomogeneous broadening and quantum-dot sheet density, on the performance of a proposed quantum cascade laser design. In terms of achieving a positive modal net gain, a high quantum-dot density can compensate for moderately high inhomogeneous broadening, but at a cost of increased threshold current density. However, by minimizing quantum-dot density with presently achievable inhomogeneous broadening and total losses, significantly lower threshold densities than those reported in quantum-well quantum-cascade lasers are predicted by our theory.

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Room temperature midinfrared electroluminescence from InAs quantum dots

Cited by 29 publications

References 20 publications

Excitation injector in an atomic chain: Long-range transport and efficiency amplification

Excitation injector in an atomic chain: Long-range transport and efficiency amplification

Microscopic model for intersubband gain from electrically pumped quantum-dot structures

Mid-Infrared Quantum-Dot Quantum Cascade Laser: A Theoretical Feasibility Study

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