Millimetre-wave negative differential conductance in GaInAs/AlInAs semiconductor superlattices

Minot, C.; Sahri, N.; Person, H. Le; Palmier, J.F.; Harmand, J. C.; Médus, J.; Esnault, J.C.

doi:10.1006/spmi.1996.0247

Cited by 11 publications

(9 citation statements)

References 17 publications

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“…In this case the parasitic positive conductance contributes to a shrinkage of the resonant behaviour. The fabrication of mm-wave sources from structure B nevertheless leads to multi-mode cavity oscillations of up to 74 GHz [10]. Other groups have reported similar results in GaAs/AlAs SLs [11].…”

Section: Superlattices As Mm-wave Oscillatorsmentioning

confidence: 76%

“…However, we may expect the presence of high-laying minibands to affect transport in a qualitatively new manner. For instance the application of sufficiently high electric fields opens the way to inter-miniband transfer, an effect suspected to play a detrimental role in the smearing of Bloch oscillations or in the efficiency reduction of SL microwave oscillators [10]. Here we experimentally explore inter-miniband conduction in a GaAs/GaAlAs (1) 2 (1) 3 (3) 3 (3) 2 (2) 2 (2) 2 (3) 2 ( SL, so designed that the inter-miniband spacing allowed transfer under moderate fields.…”

Section: Zener Inter-miniband Resonant Breakdownmentioning

confidence: 99%

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Recent results on superlattice transport and optoelectronics applications

Palmier¹,

Minot

Harmand

et al. 1999

Superlattices and Microstructures

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Section: Superlattices As Mm-wave Oscillatorsmentioning

confidence: 76%

Section: Zener Inter-miniband Resonant Breakdownmentioning

confidence: 99%

Recent results on superlattice transport and optoelectronics applications

Palmier¹,

Minot

Harmand

et al. 1999

Superlattices and Microstructures

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“…Excitability and self-sustained oscillations involve the generation of charge dipole waves inside the SSL and their motion [ 5 ]. Devices made out of SSLs include oscillators [ 6 , 7 , 8 , 9 ], detectors [ 10 , 11 , 12 , 13 ], quantum cascade lasers [ 5 , 14 , 15 , 16 , 17 , 18 , 19 ], and all-electronic fast generators of true random numbers [ 20 , 21 ]. The latter are crucial to secure fast and safe data storage and transmission [ 22 , 23 , 24 ], stochastic modeling [ 25 ], and Monte Carlo simulations [ 26 ].…”

Section: Introductionmentioning

confidence: 99%

Hyperchaos, Intermittency, Noise and Disorder in Modified Semiconductor Superlattices

Bonilla

Carretero

Mompó

2022

Entropy

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Weakly coupled semiconductor superlattices under DC voltage bias are nonlinear systems with many degrees of freedom whose nonlinearity is due to sequential tunneling of electrons. They may exhibit spontaneous chaos at room temperature and act as fast physical random number generator devices. Here we present a general sequential transport model with different voltage drops at quantum wells and barriers that includes noise and fluctuations due to the superlattice epitaxial growth. Excitability and oscillations of the current in superlattices with identical periods are due to nucleation and motion of charge dipole waves that form at the emitter contact when the current drops below a critical value. Insertion of wider wells increases superlattice excitability by allowing wave nucleation at the modified wells and more complex dynamics. Then hyperchaos and different types of intermittent chaos are possible on extended DC voltage ranges. Intrinsic shot and thermal noises and external noises produce minor effects on chaotic attractors. However, random disorder due to growth fluctuations may suppress any regular or chaotic current oscillations. Numerical simulations show that more than 70% of samples remain chaotic when the standard deviation of their fluctuations due to epitaxial growth is below 0.024 nm (10% of a single monolayer) whereas for 0.015 nm disorder suppresses chaos.

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“…Earlier, significant attention was paid to the study of the influence of the electron scattering on the high-frequency conductivity of superlattices. In particular, it has been shown that the heating processes formed both by the elastic and the inelastic scattering of electrons can substantially determine the frequency region of the negative differential conductivity (NDC) effect in this structures [14][15][16] .…”

Section: Introductionmentioning

confidence: 99%

The non-linear terahertz response of hot electrons in low-dimensional semiconductor superlattices: Suppression of the polar-optical phonon scattering

Игнатов

2017

Journal of Applied Physics

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……We study the response of low-dimensional semiconductor superlattices to strong terahertz fields on condition of a strong suppression of inelastic scattering processes of electrons caused by the polar-optical phonons. For our study we employ a balance equations approach which allows investigating the response of the superlattices to strong terahertz fields taking account of both the inelastic and the strongly pronounced elastic scattering of electrons. Our approach provides a way to analyze the influence of the Bloch dynamics of electrons in a superlattice miniband side by side with the effects of the electron heating on the magnitude and the frequency dependence of a superlattice current responsivity in the terahertz frequency band. Our study shows that the suppression of the inelastic scattering caused either by a reduction of the superlattice dimensionality by lateral quantization or by a strong magnetic field application can give rise to a huge enhancement of the current responsivity. This enhancement can be interpreted in terms of the well pronounced electronic bolometric effect occurring due to the efficient electron heating in the low-dimensional superlattices by the incident terahertz fields.

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Millimetre-wave negative differential conductance in GaInAs/AlInAs semiconductor superlattices

Cited by 11 publications

References 17 publications

Recent results on superlattice transport and optoelectronics applications

Recent results on superlattice transport and optoelectronics applications

Hyperchaos, Intermittency, Noise and Disorder in Modified Semiconductor Superlattices

The non-linear terahertz response of hot electrons in low-dimensional semiconductor superlattices: Suppression of the polar-optical phonon scattering

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