Exploring Parity Anomaly for Dual Peak Infrared Photodetection
| Autor: | Daniel Neves Micha, Marcelo Z. Maialle, R. M. S. Kawabata, Germano Maioli Penello, Patricia L. Souza, Marcos H. Degani, Mauricio P. Pires |
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| Rok vydání: | 2016 |
| Předmět: |
Physics
Photocurrent Condensed matter physics Superlattice 02 engineering and technology Photodetection Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Condensed Matter Physics Atomic and Molecular Physics and Optics 020210 optoelectronics & photonics Excited state 0202 electrical engineering electronic engineering information engineering Electrical and Electronic Engineering Atomic physics Quantum well infrared photodetector Ground state Quantum well Dark current |
| Zdroj: | IEEE Journal of Quantum Electronics. 52:1-6 |
| ISSN: | 1558-1713 0018-9197 |
| Popis: | In this paper, we show a superlattice quantum well infrared photodetector (S-QWIP) grown by metal-organic vapor phase epitaxy with two narrow photocurrent peaks in the mid infrared range due to transitions between the ground state from a quantum well and two excited states localized in the continuum. The structure composed of InGaAs/InAlAs quantum-well lattice matched to InP with a central quantum well acting as an artificial defect. The potential profile is carefully chosen to explore the parity anomaly of the continuum localized states and also to reduce the thermoexcited electrons decreasing the dark current. The photocurrent spectrum shows two peaks with transition energies of 300 and 460 meV ( $\Delta \lambda /\lambda $ of 0.13 and 0.12) at 12 K. The peak detectivity is $1.2 3\times 10^{\mathrm { {10}}}$ Jones at 30 K and +5 V. When compared with a regular multiquantum well sample designed to generate photocurrent at the same wavelength, the S-QWIP shows an increase of 15 K on its background-limited performance temperature and a lower dark current for temperatures above 200 K. |
| Databáze: | OpenAIRE |
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