We have investigated the effect of non-equilibrium phonons on carrier relaxation dynamics in a quantum wire following ultrafast photoexcitation. We show that phonon build-up produces a considerable reduction of the cooling rate of photoexcited carriers for densities of the order of 10(6) cm(-1). In this respect, the results for quantum wires are found to be similar to the bulk case. An important consequence of the reduced dimensionality of wires is found in the non-equilibrium phonon distribution, which is populated even at very small wave vectors.
HOT PHONONS IN QUANTUM WIRES - A MONTE-CARLO INVESTIGATION / Rota, L; Ryan, Jf; Rossi, F; Lugli, P; Molinari, Elisa. - In: EUROPHYSICS LETTERS. - ISSN 0295-5075. - STAMPA. - 28:(1994), pp. 277-282.
HOT PHONONS IN QUANTUM WIRES - A MONTE-CARLO INVESTIGATION
MOLINARI, Elisa
1994
Abstract
We have investigated the effect of non-equilibrium phonons on carrier relaxation dynamics in a quantum wire following ultrafast photoexcitation. We show that phonon build-up produces a considerable reduction of the cooling rate of photoexcited carriers for densities of the order of 10(6) cm(-1). In this respect, the results for quantum wires are found to be similar to the bulk case. An important consequence of the reduced dimensionality of wires is found in the non-equilibrium phonon distribution, which is populated even at very small wave vectors.Pubblicazioni consigliate
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