Marcos H. Degani

Intersubband Optic Phonon Resonances in Electrostatically Confined Quantum Wires

Dejan Jovanovic, Jean‐Pierre Leburton, K.E. Ismail, Jeffrey M. Bigelow et autres

This chapter analyses the occurrence of resonant intersubband optic phonon scattering in an array of quantum wires at high temperatures. Self-consistent solutions of the Schrödinger and Poisson equations with a subsequent Monte Carlo analysis of intersubband scattering reveal a strong resonant polar …

Destructive Interference of the Superconducting Subband Condensates in the Quasi-1D Multigap Material Nanostructures

Wojciech Julian Pasek, Marcos H. Degani, M. Z. Maialle

This modelling work concerns the effects of the interference between two partial subband condensates in a quasi-one-dimensional superconducting superlattice. The iterative under-relaxation with phase control method is used to solve Bogoliubov–de Gennes equations in the envelope ansatz. This method—easily generalisable to a …

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Towards an effective mass model for the quasi-1D magnesium diboride superconducting nanostructures

Wojciech Julian Pasek, Marcos H. Degani, Marcio C. de Andrade, M. Z. Maialle

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Band superconductivity in a periodic constricted nanoribbon structure

Wojciech Julian Pasek, Marcos H. Degani, Marcio C. de Andrade, M. Z. Maialle

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Quantum Well Infrared Photodetector for the SWIR Range

Pedro Henrique Pereira, Lesslie Guerra, Germano Maioli Penello, Mauricio Pamplona Pires et autres

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Progress in Symmetric and Asymmetric Superlattice Quantum Well Infrared Photodetectors

Germano Maioli Penello, Pedro Henrique Pereira, Lesslie Guerra, L. D. Pinto et autres

Abstract 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 …

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Optimal control of universal quantum gates in a double quantum dot

L. K. Castelano, Emanuel F. de Lima, Justino R. Madureira, Marcos H. Degani et autres

We theoretically investigate electron spin operations driven by applied electric fields in a semiconductor double quantum dot (DQD) formed in a nanowire with longitudinal potential modulated by local gating. We develop a model that describes the process of loading and unloading the …

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Application of the Landau-Zener-Stückelberg-Majorana dynamics to the electrically driven flip of a hole spin

Wojciech Julian Pasek, M. Z. Maialle, Marcos H. Degani

An idea of employing the Landau-Zener-St\"uckelberg-Majorana dynamics to flip a spin of a single ground state hole is introduced and explored by a time-dependent simulation. This configuration interaction study considers a hole confined in a quantum molecule formed in an InSb $\ensuremath{\langle}111\ensuremath{\rangle}$ …

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Generation of spin polarized currents with coherent trapping in magnetic semiconductors

Pedro Henrique Pereira, Anibal Thiago Bezerra, Paulo F. Farinas, M. Z. Maialle et autres

Abstract A semiconductor heterostructure consisting of two quantum wells, one of them magnetically doped, is proposed for the generation of spin currents by two lasers tuned at the resonances formed between two lowest energy states (1 and 2) and the continuum (3), …

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Exploring Parity Anomaly for Dual Peak Infrared Photodetection

Germano Maioli Penello, Marcos H. Degani, M. Z. Maialle, Rudy M. S. Kawabata et autres

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 …

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Role of multilevel Landau-Zener interference in extreme harmonic generation

J. Stehlik, M. Z. Maialle, Marcos H. Degani, J. R. Petta

Motivated by the observation of multiphoton electric dipole spin-resonance processes in InAs nanowires, we study theoretically the transport dynamics of a periodically driven five-level system, modeling the level structure of a two-electron double quantum dot. We show that the observed multiphoton resonances, …

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Detecting Infrared Radiation Beyond the Bandoffset With Intersubband Transitions

Lesslie Guerra, Germano Maioli Penello, Mauricio Pamplona Pires, L. D. Pinto et autres

InGaAs/InAlAs quantum well (QW) infrared photodetector structures have been investigated to reach operation energies larger than the heterostructure bandoffset. The structures are composed of superlattices having a central QW with a thickness different from the others, behaving as a defect within the …

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