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Manion, S. J.; Artaki, M.; Emanuel, M.A.; Coleman, J. J.; Hess, K.

doi:10.1103/physrevb.35.9203

Cited by 89 publications

(45 citation statements)

References 21 publications

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“…respectively, where the constant (27) originates from the screening of the el-ph interaction and therefore does not appear in Eq. (24) for unscreened deformation potential interaction.…”

Section: Analytic Low-temperature Limitsmentioning

confidence: 99%

Hot-electron cooling by acoustic and optical phonons in monolayers ofMoS2and other transition-metal dichalcogenides

2014

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We study hot-electron cooling by acoustic and optical phonons in monolayer MoS2. The cooling power P (Pe = P/n) is investigated as a function of electron temperature Te (0-500 K) and carrier density n (10 10 -10 13 cm −2 ) taking into account all relevant electron-phonon (el-ph) couplings. We find that the cross over from acoustic phonon dominated cooling at low Te to optical phonon dominated cooling at higher Te takes place at Te ∼ 50 − 75 K. The unscreened deformation potential (DP) coupling to the TA phonon is shown to dominate P due to acoustic phonon scattering over the entire temperature and density range considered. The cooling power due to screened DP coupling to the LA phonon and screened piezoelectric (PE) coupling to the TA and LA phonons is orders of magnitude lower. In the Bloch-Grüneisen (BG) regime, P ∼ T 4 e (T 6 e ) and P ∼ n −1/2 (Pe ∼ n −3/2 ) are predicted for unscreened (screened) el-ph interaction. The cooling power due to optical phonons is dominated by zero-order DP couplings and the Fröhlich interaction, and is found to be significantly reduced by the hot-phonon effect when the phonon relaxation time due to phonon-phonon scattering is large compared to the relaxation time due to el-ph scattering. The Te and n dependence of the hot-phonon distribution function is also studied. Our results for monolayer MoS2 are compared with those in conventional two-dimensional electron gases (2DEGs) as well as monolayer and bilayer graphene.

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“…respectively, where the constant (27) originates from the screening of the el-ph interaction and therefore does not appear in Eq. (24) for unscreened deformation potential interaction.…”

Section: Analytic Low-temperature Limitsmentioning

confidence: 99%

Hot-electron cooling by acoustic and optical phonons in monolayers ofMoS2and other transition-metal dichalcogenides

2014

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“…Hot electron relaxes to lower temperature via acoustic phonon emission. There are numerous experimental and theoretical studies [39][40][41][42][43][44][45][46][47][48][49] on hot-electron energy-loss rate of a 2DES without RSOI.…”

Section: Introductionmentioning

confidence: 99%

Phonon-drag thermopower and hot-electron energy-loss rate in a Rashba spin–orbit coupled two-dimensional electron system

Biswas

Ghosh

2013

J. Phys.: Condens. Matter

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We theoretically study phonon-drag contribution to the thermoelectric power and hot-electron energy-loss rate in a Rashba spin-orbit coupled two-dimensional electron system in the BlochGruneisen (BG) regime. We assume that electrons interact with longitudinal acoustic phonons through deformation potential and with both longitudinal and transverse acoustic phonons through piezoelectric potential. Effect of the Rashba spin-orbit interaction on magnitude and temperature dependence of the phonon-drag thermoelectric power and hot-electron energy-loss rate are discussed. We numerically extract the exponent of temperature dependence of the phonon-drag thermopower and the energy-loss rate. We find the exponents are suppressed due to the presence of the Rashba spin-orbit coupling.

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“…At low enough temperatures k B T ≪hw LO , where ω LO is the frequency of the dispersionless LO phonon, the inclusion of the phonon propagator renormalization may enhance the energy relaxation rate by orders of magnitude compared with loss through bare LO-phonon (which is exponentially small for k B T ≪hω LO ). Deviation from the naive bare-phonon result, which gives an exponentially decaying energy relaxation rate as electron temperature is lowered, is a ubiquitous phenomenon in hot-electron energy loss experiments [5][6][7][8][9], and has usually been uncritically ascribed to acoustic-phonon contribution, in spite of the fact that merely including the acoustic-phonon emission could not account for the total observed power loss. This puzzle is resolved by including the enhancement from the renormalization of the LO-phonon propagator.…”

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confidence: 99%

“…The study of this subject also constitutes a direct probe of a fundamental interaction in condensed matter physics, namely, the electron-phonon interaction. There has been considerable recent theoretical and experimental interest in the hot-electron energy relaxation problem in polar semiconductors, particularly in three-dimensional (3D) and two-dimensional (2D) GaAs structures [1][2][3][4][5][6][7][8][9]. More recently, one-dimensional (1D) hot-electron relaxation in quantum wire structures has been considered theoretically [10][11][12], motivated by the fact that there has been successful growth of one-dimensional GaAs quantum-well wires with only the lowest subband occupied [13].…”

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confidence: 99%

Energy relaxation of an excited electron gas in quantum wires: Many-body electron-LO-phonon coupling

Zheng

Sarma

1996

Phys. Rev. B

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We theoretically study energy relaxation via LO-phonon emission in an excited one-dimensional electron gas confined in a GaAs quantum wire structure. We find that the inclusion of phonon renormalization effects in the theory extends the LO-phonon dominated loss regime down to substantially lower temperatures. We show that a simple plasmon-pole approximation works well for this problem, and discuss implications of our results for low temperature electron heating experiments in quantum wires.

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Electron-energy-loss rates inAlxGa1−

Cited by 89 publications

References 21 publications

Hot-electron cooling by acoustic and optical phonons in monolayers ofMoS2and other transition-metal dichalcogenides

Hot-electron cooling by acoustic and optical phonons in monolayers ofMoS2and other transition-metal dichalcogenides

Phonon-drag thermopower and hot-electron energy-loss rate in a Rashba spin–orbit coupled two-dimensional electron system

Energy relaxation of an excited electron gas in quantum wires: Many-body electron-LO-phonon coupling

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