Exploring Parity Anomaly for Dual Peak Infrared Photodetection

Penello, Germano Maioli; Degani, Marcos H.; Maialle, M. Z.; Kawabata, R.; Micha, Daniel Neves; Pires, M. P.; Souza, P. L.

doi:10.1109/jqe.2016.2623271

Cited by 13 publications

(4 citation statements)

References 28 publications

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“…The reference superlattices for this investigation are the symmetric [8] and asymmetric superlattice with a structural defect [10] previously studied. These heterostructures were designed to detect mid-infrared radiation, specifically at 290 meV and 440 meV.…”

Section: Resultsmentioning

confidence: 99%

“…The black cross and the gray square seen in Fig. 2(c) represent the experimental values of the oscillator strength for the first localized and the first leaky electronic states obtained by the experimental absorption spectra of a symmetric [8] and an asymmetric superlattice [10], respectively. The experimental oscillator strength of the symmetric superlattice is 0.28 ± 0.01, 12% higher than the theoretical value.…”

Section: B Leaky Electronic States In the Continuum In An Asymmetric ...mentioning

confidence: 99%

“…Recently, the BICs have been extensively explored in diverse systems, such as photonics [3], metamaterials [4], THz resonators [5], and superlattice infrared photodetectors (SLIPs) [6]. In particular, their use in InGaAs/InAlAs SLIPs presents many advantages over the quantum well infrared photodetectors (QWIPs), which are: low thermal excitation, anomalous parity, detection energy not limited by the material band offset, dual-mode operation, and room temperature operation [7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

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Role of Structural Parameters on the Leaky Electronic States in the Continuum of Superlattice Structures

Pereira

Penello²,

Pires³

et al. 2020

JICS

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We present the concept of a leaky electronic state in the continuum in a semiconductor superlattice with a structural defect. The required conditions for such unusual electronic state were investigated through self- consistent simulations. The number of quantum wells and the position of the dopants in the superlattice are essential for the creation of the leaky electronic state. The influence of these parameters was analyzed through the oscillator strength of the optical transition between the ground state and the first and second leaky electronic states in the continuum. To produce two leak electronic states in the continuum, it is necessary one asymmetric superlattice with five quantum wells on the left side of the n-doped structural defect quantum well and one quantum well on the right one, and their oscillator strengths are 0.22 and 0.05, respectively.

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Section: Resultsmentioning

confidence: 99%

Section: B Leaky Electronic States In the Continuum In An Asymmetric ...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Role of Structural Parameters on the Leaky Electronic States in the Continuum of Superlattice Structures

Pereira

Penello²,

Pires³

et al. 2020

JICS

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“…Both QWIPs and QCDs depend on the electronic confinement and the energy levels that result from this confinement. In order to create another degree of freedom to tune the energy levels, photodetectors based on localized electronic states in the continuum were developed [5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Electronic Confinement in the Continuum: Leaky Bragg Mirror for Electrons

Souza

Penello

Pereira

et al. 2020

JICS

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In this work we present an InGaAs/InAlAs heterostructure lattice matched with InP that holds two leaky electronic states in the continuum. An optical analogy with Bragg mirrors is used to explain the origin and the desired characteristics of the leaky electronic state. Multipass waveguide absorption measurements were performed and theoretical calculations used to determine the energy levels involved in the optical transitions. The comparison between the theoretical and experimental oscillator strength shows the good optical quality of the sample.

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Progress in Symmetric and Asymmetric Superlattice Quantum Well Infrared Photodetectors

et al. 2019

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Herein, two challenges are addressed, which quantum well infrared photodetectors (QWIPs), based on III-V semiconductors, face, namely: photodetection within the so-called "forbidden gap", between 1.7 and 2.5 microns, and room temperature operation using thermal sources. First, to reach this forbidden wavelength range, a QWIP which consists of a superlattice structure with a central quantum well (QW) with a different thickness is presented. The different QW in the symmetric structure, which plays the role of a defect in the otherwise periodic structure, gives rise to localized states in the continuum. The proposed InGaAs/InAlAs superlattice QWIP detects radiation around 2.1 microns, beyond the materials bandoffset. Additionally, the wavefunction parity anomaly is explored to increase the oscillator strength of the optical transitions involving higher order states. Second, with the purpose of achieving room temperature operation, an asymmetric InGaAs/InAlAs superlattice, in which the QW with a different thickness is not in the center, is used to detect infrared radiation around 4 microns at 300 K. This structure operates in the photovoltaic mode because it gives rise to states in the continuum which are localized in one direction and extended in the other, leading to a preferential direction for current flow.

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Exploring Parity Anomaly for Dual Peak Infrared Photodetection

Cited by 13 publications

References 28 publications

Role of Structural Parameters on the Leaky Electronic States in the Continuum of Superlattice Structures

Role of Structural Parameters on the Leaky Electronic States in the Continuum of Superlattice Structures

Electronic Confinement in the Continuum: Leaky Bragg Mirror for Electrons

Progress in Symmetric and Asymmetric Superlattice Quantum Well Infrared Photodetectors

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