Generation and amplification of sub-THz coherent acoustic phonons under the drift of two-dimensional electrons

Komirenko, S. M.; Demidenko, A. A.; Kochelap, V. A.; Stroscio, Michael A.

doi:10.1103/physrevb.62.7459

Cited by 48 publications

(24 citation statements)

References 20 publications

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“…Particularly, phenomena such as the high electron mobility and phonon confinement effects can considerably facilitate achieving phonon amplification and generation from drifting electrons. 10 Alternatively, if the current is due to the transitions of carriers between the bound-electron states ͑hopping transport͒, generation of coherent phonons can be realized if the population inversion of these states occurs. Similar effects for photon generation are demonstrated, for example, in cascade lasers.…”

Section: Introductionmentioning

confidence: 99%

Generation of high-frequency coherent acoustic phonons in superlattices under hopping transport. I. Linear theory of phonon instability

Glavin¹,

Kochelap²,

Linnik³

et al. 2002

Phys. Rev. B

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In this work we consider the theory of high-frequency phonon generation in a weakly coupled doped semiconductor superlattice. Electric bias, applied to such a superlattice, destroys the electron minibands, creates electron states localized in the individual quantum wells, and forms population inversion between these states. An electric current occurs due to the phonon-induced interwell hops. We show that under such conditions the electric current produces a phonon instability: populations of phonon modes propagating almost collinearly with the superlattice axis increase exponentially in time. It is demonstrated that the population growth increment can be as high as several times 10 8 s Ϫ1 , and considerably exceeds the internal phonon scattering rates. Also discussed are effects influencing the increment, such as a screening of the electronphonon interaction and a modification of the phonon spectrum in superlattices.

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Section: Introductionmentioning

confidence: 99%

Generation of high-frequency coherent acoustic phonons in superlattices under hopping transport. I. Linear theory of phonon instability

Glavin¹,

Kochelap²,

Linnik³

et al. 2002

Phys. Rev. B

Self Cite

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“…A few methods for GHz-THz sound amplification have been proposed. Some have so far been explored only theoretically [8,9] and others have been explored only in noncoherent experiments [10,11]. In order to obtain much stronger evidence for coherent sound amplification by stimulated phonon emission, it is essential to use a detection technique that is sensitive to the coherent nature of the acoustic modes.…”

mentioning

confidence: 99%

Coherent Terahertz Sound Amplification and Spectral Line Narrowing in a Stark Ladder Superlattice

et al. 2010

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The bias voltage applied to a weakly coupled n-doped GaAs/AlAs superlattice increases the amplitude of the coherent hypersound oscillations generated by a femtosecond optical pulse. This bias-induced amplitude increase and experimentally observed spectral narrowing of the superlattice phonon mode with a frequency 441 GHz provides the evidence for hypersound amplification by stimulated emission of phonons in a system where the inversion of the electron populations for phonon-assisted transitions exists.

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“…The phonon amplification by means of the Cerenkov effect can be experimentally feasible thanks to the relevant practice of nanowires as quantum wires have been fabricated with radii as small as, or even smaller than, 16 nm [17]. Also, because of their relatively high mobility values (µ 1D ≥ 10 4 cm 2 V −1 s −1 ) the quantum wires are excellent candidates for the use of the Cerenkov effect in nanostructures [13,18,19].…”

Section: Introductionmentioning

confidence: 98%

Phonon amplification in a quasi-one-dimensional GaAs quantum channel

Nunes

Fonseca

Agrello

2002

Superlattices and Microstructures

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Generation and amplification of sub-THz coherent acoustic phonons under the drift of two-dimensional electrons

Cited by 48 publications

References 20 publications

Generation of high-frequency coherent acoustic phonons in superlattices under hopping transport. I. Linear theory of phonon instability

Generation of high-frequency coherent acoustic phonons in superlattices under hopping transport. I. Linear theory of phonon instability

Coherent Terahertz Sound Amplification and Spectral Line Narrowing in a Stark Ladder Superlattice

Phonon amplification in a quasi-one-dimensional GaAs quantum channel

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