Coherent optical phonon generation by the electric current in quantum wells

Komirenko, S. M.; Kochelap, V. A.; Fedorov, I. A.; Stroscio, Michael A.

doi:10.1063/1.1334653

Cited by 15 publications

(14 citation statements)

References 9 publications

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“…Solution of Eqs. (21), (26) and (27) requires to provide initial conditions. Considering the initial state as a equilibrium one, the initial condition for populations N q (t) is N (t = 0) = e β 0 ωq − 1 −1 , and those for ĉ q |t = 0 and σ q (t = 0) are zero.…”

Section: Evolution Of the Nonequilibrium Macrostate Of The Magnon Systemmentioning

confidence: 99%

Dynamics of a Bose-Einstein condensate of excited magnons

2013

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Abstract. The emergence of a non-equilibrium Bose-Einstein-like condensation of magnons in rf-pumped magnetic thin films has recently been experimentally observed. We present here a complete theoretical description of the non-equilibrium processes involved. It it demonstrated that the phenomenon is another example of the presence of a Bose-Einstein-like condensation in nonequilibrium many-boson systems embedded in a thermal bath, better referred-to as Fröhlich-Bose-Einstein condensation. The complex behavior emerges after a threshold of the exciting intensity is attained. It is inhibited at higher intensities when the magnon-magnon interaction drives the magnons to internal thermalization. The observed behavior of the relaxation to equilibrium after the end of the pumping pulse is also accounted for and the different processes fully described.

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Section: Evolution Of the Nonequilibrium Macrostate Of The Magnon Systemmentioning

confidence: 99%

Dynamics of a Bose-Einstein condensate of excited magnons

2013

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“…Then the carrier distribution function and its scattering dynamics can be parameterized by a real-space coordinate. But such non-homogeneities are characterized by a space scale which is much longer than the carrier coherence length [13][14][15][16][17][18]. The electron eigen state and energy band profile are obtained by solving the Schrödinger-Poisson equations [15,20,26].…”

Section: Theory Framementioning

confidence: 99%

“…L ¼60 nm is the period length of injection and active region. In order to get the optimized value of γ q , we set the m ¼1 as The value of γ is maximal for the lowest optical mode with m ¼1 [18]. κ el (q, ω LO ) E1is the estimated electron permittivity depending on the LO phonon wave vector q and frequency, we get the simplified value: In our n-doped AlGaAs/GaAs heterostructure, κ 0 ¼12.9, and κ 1 ¼10.8, m* ¼0.067m 0 is the effective mass, where m 0 is the mass of free electron.…”

Section: Theory Framementioning

confidence: 99%

“…We derive a general formula of the phonon population N q as a function of time via the Cerenkov Effect with the kinetic conservation equation [18]:…”

Section: Theory Framementioning

confidence: 99%

“…The energy relaxation of carriers is determined mostly by electron-LO phonon interaction and it has been shown that the phonon population decreases leading to the lattice temperature increases [17]. An electric current flowing through a semiconductor can produce coherent acoustic and optical phonons via the Cerenkov Effect as long as the electron drift velocity exceeds the phonon phase velocity [18]. Following three requirements are required for practical use of the Cerenkov Effect: high electron mobility, large electron density, and strong coupling between electrons and amplified phonons.…”

Section: Introductionmentioning

confidence: 99%

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The generation rate of optical phonons in quantum cascade lasers under different applied field

Zhao

Chen

2017

Optics Communications

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Non‐Equilibrium Bose–Einstein‐Like Condensation

2018

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The original Bose–Einstein condensation (BEC) was theoretically established in the 1920s, for the case of an ideal gas of boson particles (a consequence of the symmetry of the wave function). In the 1990s, it was realized in systems of atomic alkali gases. At the beginning of the 21st century, investigators considered its emergence in solid‐state matter, and a BEC‐like phenomenon was observed in the case of bosonic quasiparticles (elementary excitations in solids). Both types of BEC can occur in a condensation in conditions of thermodynamic equilibrium. A third type of what has been dubbed a BEC in non‐equilibrium conditions can occur in systems of bosonic quasiparticles (phonons, magnons, excitons); this phenomenon (which can be considered as cases of systems with complex behavior) follows after a certain threshold of intensity of an external pumping source is achieved. In this review, after brief comments on the two types of BEC in equilibrium, a description is presented on how a BEC‐like phenomenon arises in systems of quasiparticles that are driven away from thermodynamic equilibrium, and several examples are described. This description is given within a unique theoretical framework, and a comparison with experimental results is performed; in addition, the possible technological applications are outlined.

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Coherent optical phonon generation by the electric current in quantum wells

Cited by 15 publications

References 9 publications

Dynamics of a Bose-Einstein condensate of excited magnons

Dynamics of a Bose-Einstein condensate of excited magnons

The generation rate of optical phonons in quantum cascade lasers under different applied field

Non‐Equilibrium Bose–Einstein‐Like Condensation

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