Semiconductor superlattice in a biharmonic field: Absolute negative conductivity and static electric-field generation

Romanov, Yuriy A.; Romanova, Julia Yu.; Mourokh, Lev G.

doi:10.1063/1.2158497

Cited by 21 publications

(23 citation statements)

References 21 publications

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“…48,49 However, at least in the case of generation with the monochromatic pump field, the coherent term always contributes to the high-frequency gain. A more detailed analysis of this situation, including consideration of microwave and subterahertz pump fields, 50,51 will be presented elsewhere.…”

Section: Discussionmentioning

confidence: 99%

Bloch gain in dc-ac-driven semiconductor superlattices in the absence of electric domains

2008

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We study theoretically the feasibility of amplification and generation of terahertz radiation in dc-ac-driven semiconductor superlattices in the absence of electric domains. We find that if in addition to dc bias a strong THz pump field is applied, Bloch gain profile for a small THz signal can be achieved under conditions of positive static differential conductivity. Here the positive differential conductivity arises, similarly to the case of large-signal amplification scheme [H. Kroemer, cond-mat/0009311)], due to modifications of dc current density caused by the application of highfrequency ac field [K. Unterrainer et al., Phys. Rev. Lett. 76, 2973]. Whereas the sign of absorption at low and zero frequencies is sensitive to the ac fields, the gain profile in the vicinity of gain maximum is robust. We suggest to use this ac-induced effect in a starter for THz Bloch oscillator. Our analysis demonstrates that the application of a short THz pulse to a superlattice allows to suppress the undesirable formation of electric domains and reach a sustained large-amplitude operation of the dc-biased Bloch oscillator.

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Section: Discussionmentioning

confidence: 99%

Bloch gain in dc-ac-driven semiconductor superlattices in the absence of electric domains

2008

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“…Corresponding studies for the case of the SLs with sinusoidal miniband in the presence of a biharmonic field were performed in Refs. [15,17,19,25,26,29]. In the present work, we present more general results including arbitrary minibands and arbitrary electric fields.…”

Section: Current-voltage Characteristics Nonlinear Conductivities Amentioning

confidence: 95%

“…It should be noted that the reformulation of the problem in terms of the complex function instead of the real distribution function f(k,t) corresponds to the description in terms of the first partial moments of the distribution function: the average velocity (or current) and average electron energy, as can be seen from Eqs. (25,26). This approach was used in Ref.…”

Section: Superlattice Transparency Basic Relationsmentioning

confidence: 99%

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Electron Bloch oscillations and electromagnetic transparency of semiconductor superlattices in multi-frequency electric fields

2009

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We examine phenomenon of electromagnetic transparency in semiconductor superlattices (having various miniband dispersion laws) in the presence of multi-frequency periodic and nonperiodic electric fields. Effects of induced transparency and spontaneous generation of static fields are discussed. We paid a special attention on a self-induced electromagnetic transparency and its correlation to dynamic electron localization. Processes and mechanisms of the transparency formation, collapse, and stabilization in the presence of external fields are studied.In particular, we present the numerical results of the time evolution of the superlattice current in an external biharmonic field showing main channels of transparency collapse and its partial stabilization in the case of low electron density superlattices.

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“…In [16][17][18][19][20][21][22][23] amplification of even harmonics of the polychromatic pump field in SL was shown to be accompanied by the appearance of a constant component of the field -so-called mutual rectification due to wave mixing [24][25][26][27][28][29][30][31][32]. Further such features of electron spectrum of GSL as periodicity and nonadditivity are shown to change the character of wave mixing effect in GSL and to be a cause of new peculiarities different from that of in bulk SL [31,32].…”

Section: Introductionmentioning

confidence: 99%

Influence of the constant electric field on the mutual rectification of the electromagnetic waves in graphene superlattice

Kryuchkov

Kukhar

2012

Physica E: Low-dimensional Systems and Nanostructures

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In tight binding approximation the explicit form of the electron energy in graphene superlattice was derived. The possibility of propagation of the cnoidal waves in graphene superlattice was discussed. The direct current induced perpendicularly to the superlattice axis by cnoidal and sinusoidal electromagnetic waves under the presence of longitudinal constant electric field was calculated. Such direct current was shown to change its direction when the intensity of longitudinal electric field changes its absolute value.

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Semiconductor superlattice in a biharmonic field: Absolute negative conductivity and static electric-field generation

Cited by 21 publications

References 21 publications

Bloch gain in dc-ac-driven semiconductor superlattices in the absence of electric domains

Bloch gain in dc-ac-driven semiconductor superlattices in the absence of electric domains

Electron Bloch oscillations and electromagnetic transparency of semiconductor superlattices in multi-frequency electric fields

Influence of the constant electric field on the mutual rectification of the electromagnetic waves in graphene superlattice

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