Hot phonon effects on the high-field transport in metallic carbon nanotubes

Auer, Christoph; Schürrer, Ferdinand; Ertler, Christian

doi:10.1103/physrevb.74.165409

Cited by 34 publications

(47 citation statements)

References 26 publications

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“…This time can be markedly longer than τ can exceed or substantially exceed unity. As shown [30][31][32][33][34], τ decay 0 in GLs is in the range of 1 -10 ps. As calculated recently [17], the charactertic times τ inter 0 and τ intra 0 can be longer than 1 ps.…”

Section: Equations Of the Modelmentioning

confidence: 95%

Toward the creation of terahertz graphene injection laser

Ryzhii

Mitin

et al. 2011

Journal of Applied Physics

146

117

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We study the effect of population inversion associated with the electron and hole injection in graphene p-i-n structures at the room and slightly lower temperatures. It is assumed that the recombination and energy relaxation of electrons and holes is associated primarily with the interband and intraband processes assisted by optical phonons. The dependences of the electron-hole and optical phonon effective temperatures on the applied voltage, the current-voltage characteristics, and the frequency-dependent dynamic conductivity are calculated. In particular, we demonstrate that at low and moderate voltages the injection can lead to a pronounced cooling of the electron-hole plasma in the device i-section to the temperatures below the lattice temperature. However at higher voltages, the voltage dependences can be ambiguous exhibiting the S-shape. It is shown that the frequency-dependent dynamic conductivity can be negative in the terahertz range of freqiencies at certain values of the applied voltage. The electron-hole plasma cooling substantially reinforces the effect of negative dynamic conductivity and promotes the realization of terahertz lasing. On the other hand, the heating of optical phonon system can also be crucial affecting the realization of negative dynamic conductivity and terahertz lasing at the room temperatures.

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Section: Equations Of the Modelmentioning

confidence: 95%

Toward the creation of terahertz graphene injection laser

Ryzhii

Mitin

et al. 2011

Journal of Applied Physics

146

117

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“…Eqs. (19)(20)(21)(22)(23)(24) are the generalization of the Caroli formula 22 to include the electron-phonon interaction.…”

Section: The Electrical and Energy Currentmentioning

confidence: 99%

“…Only recently, the nonequilibrium Green's function method 9,10,11,12 , which has been widely used to study the electronic transport, has been applied to study the quantum phononic transport 13,14,15,16,17 . As far as we know, the study of the coupled electronic and phononic transport in nanostructures is rare 18,19,20,21 . In Ref.…”

Section: Introductionmentioning

confidence: 99%

Coupled electron and phonon transport in one-dimensional atomic junctions

2007

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Employing the nonequilibrium Green's function method, we develop a fully quantum mechanical model to study the coupled electron-phonon transport in one-dimensional atomic junctions in the presence of a weak electron-phonon interaction. This model enables us to study the electronic and phononic transport on an equal footing. We derive the electrical and energy currents of the coupled electron-phonon system and the energy exchange between them. As an application, we study the heat dissipation in current carrying atomic junctions within the self-consistent Born approximation, which guarantees energy current conservation. We find that the inclusion of phonon transport is important in determining the heat dissipation and temperature change of the atomic junctions.

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“…The deviation of the optical phonon system from equilibrium can also affect the properties of GL, as it occurs in carbon nanotubes (see for instance Refs. [18][19][20][21][22][23][24]), in particular, affect the interband generation-recombination processes. Increase of the number of nonequilibrium phonons result in the increase of stimulated optical phonon emission and may lead to the generation of coherent phonons in graphene like it was discussed for a different systems [25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Effect of Heating and Cooling of Photogenerated Electron–Hole Plasma in Optically Pumped Graphene on Population Inversion

Ryzhii

Mitin

et al. 2011

Jpn. J. Appl. Phys.

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We study the characteristics of photogenerated electron-hole plasma in optically pumped graphene layers at elevated (room) temperatures when the interband and intraband processes of emission and absorption of optical phonons play a crucial role. The electron-hole plasma heating and cooling as well as the effect of nonequilibrium optical phonons are taken into account. The dependences of the quasi-Fermi energy and effective temperature of optically pumped graphene layers on the intensity of pumping radiation are calculated. The variation of the frequency dependences dynamic conductivity with increasing pumping intensity as well as the conditions when this conductivity becomes negative in a certain range of frequencies are considered. The effects under consideration can markedly influence the achievement of the negative dynamic conductivity in optically pumped graphene layers associated with the population inversion and, hence, the realization graphene-based terahertz and infrared lasers operating at room temperatures.

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Hot phonon effects on the high-field transport in metallic carbon nanotubes

Cited by 34 publications

References 26 publications

Toward the creation of terahertz graphene injection laser

Toward the creation of terahertz graphene injection laser

Coupled electron and phonon transport in one-dimensional atomic junctions

Effect of Heating and Cooling of Photogenerated Electron–Hole Plasma in Optically Pumped Graphene on Population Inversion

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