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Your search keyword '"Razeghi, Manijeh"' showing total 2,647 results
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2,647 results on '"Razeghi, Manijeh"'

1. Short wavelength infrared avalanche photodetector using Sb-based strained layer superlattice

Author

Dehzangi, Arash, Li, Jiakai, and Razeghi, Manijeh

Subjects
Physics - Applied Physics
Abstract

We demonstrate a low noise short wavelength infrared (SWIR) Sb based type II superlattice (T2SL) avalanche photodiodes (APD). The SWIR GaSb/(AlAsSb/GaSb) APD structure was designed based on impact ionization engineering and grown by molecular beam epitaxy on GaSb substrate. At room temperature, the device exhibits a 50 % cut-off wavelength of 1.74 micron. The device revealed to have electron dominated avalanching mechanism with a gain value of 48 at room temperature. The electron and hole impact ionization coefficients were calculated and compared to give better prospect of the performance of the device. Low excess noise, as characterized by the carrier ionization ratio of ~ 0.07, has been achieved., Comment: 11 pages , 6 figures

Published
2021

2. Combined resonant tunneling and rate equation modeling of terahertz quantum cascade lasers.

Author

Chen, Zhichao, Liu, Andong, Chang, Dong, Dhillon, Sukhdeep, Razeghi, Manijeh, and Wang, Feihu

Subjects
RATE equation model, QUANTUM cascade lasers, GREEN'S functions, DENSITY matrices, RESONANT tunneling, INTERFACIAL roughness, STIMULATED emission
Abstract

Terahertz (THz) quantum cascade lasers (QCLs) are technologically important laser sources for the THz range but are complex to model. An efficient extended rate equation model is developed here by incorporating the resonant tunneling mechanism from the density matrix formalism, which permits to simulate THz QCLs with thick carrier injection barriers within the semi-classical formalism. A self-consistent solution is obtained by iteratively solving the Schrödinger–Poisson equation with this transport model. Carrier–light coupling is also included to simulate the current behavior arising from stimulated emission. As a quasi-ab initio model, intermediate parameters, such as pure dephasing time and optical linewidth, are dynamically calculated in the convergence process, and the only fitting parameters are the interface roughness correlation length and height. Good agreement has been achieved by comparing the simulation results of various designs with experiments, and other models such as density matrix Monte Carlo and non-equilibrium Green's function method that, unlike here, require important computational resources. The accuracy, compatibility, and computational efficiency of our model enable many application scenarios, such as design optimization and quantitative insights into THz QCLs. Finally, the source code of the model is also provided in the supplementary material of this article for readers to repeat the results presented here, investigate, and optimize new designs. [ABSTRACT FROM AUTHOR]

Published
2024
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24. Terahertz magnetism of rutile antiferromagnets

Author

Wegrowe, Jean-Eric, Friedman, Joseph S., Razeghi, Manijeh, Jaffrès, Henri, Metzger, Thomas W. J., Grishunin, Kirill A., Reinhoffer, Chris, Dubrovin, Roman M., Arshad, Atiqa, Ilyakov, Igor, Oliveira, Thales V. A. G., Ponomaryov, Alexey, Deinert, Jan-Christoph, Kovalev, Sergey, Pisarev, Roman V., Katsnelson, Mikhail I., Ivanov, Boris A., Van Loosdrecht, Paul H. M., Kimel, Alexey V., and Mashkovich, Evgeny

Published
2024
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33. Vertically graded FeNi alloys with low damping and a sizeable spin-orbit torque

Author

Wegrowe, Jean-Eric, Friedman, Joseph S., Razeghi, Manijeh, Jaffrès, Henri, Maizel, Rachel E., Wu, Shuang, Balakrishnan, Purnima P., Grutter, Alexander J., Kinane, Christy J., Caruana, Andrew J., Nakarmi, Prabandha, Nepal, Bhuwan, Smith, David A., Lim, Youngmin, Jones, Julia L., Thomas, Wyatt C., Zhao, Jing, Michel, F. Marc, Mewes, Tim, and Emori, Satoru

Published
2024
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