Direct evidence of interlevel exciton transitions mediated by single phonons in a semiconductor quantum dot using resonance fluorescence spectroscopy

作者：Flagg Edward B^*; Robertson John W; Founta Sé bastien; Ma Wenquan; Xiao Min; Salamo Gregory J; Shih Chih Kang

来源：Physical Review Letters, 2009, 102(9): 097402.

DOI：10.1103/PhysRevLett.102.097402

• Acoustic phonons
• Decoherence
• Electronic levels
• Exciton transitions
• First excited state
• Quantum state
• Rate-equation analysis
• Resonance fluorescences
• Single quantum dots
• Up conversions

Using resonance fluorescence, we investigate how acoustic phonons mediate couplings between multiple electronic levels in a semiconductor quantum dot. We show the first direct evidence of population up-conversion in a single quantum dot, which we attribute to absorption of single acoustic phonons. Moreover, through a rate equation analysis, we find that below 20 K such single-phonon mediated couplings between the exciton ground state and the first excited state are primarily responsible for decoherence of the exciton quantum state. ? 2009 The American Physical Society.

• 出版日期2009
• 单位National Institute of Standards and Technology