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Abstract
We use the BlochRedfieldWangsness theory to calculate the effects of acoustic phonons in coherent control experiments where quantumdot excitons are driven by shaped laser pulses. This theory yields a generalized Lindblad equation for the density operator of the dot, with timedependent damping and decoherence due to phonon transitions between the instantaneous dressed states. It captures similar physics to the form recently applied to Rabi oscillation experiments [Ramsay et al., Phys. Rev. Lett. 104 017402 (2010)] but guarantees positivity of the density operator. At sufficiently low temperatures, it gives results equivalent to those of fully nonMarkovian approaches [Lüker et al., Phys. Rev. B 85 121302 (2012)] but is significantly simpler to simulate. Several applications of this theory are discussed. We apply it to adiabatic rapid passage experiments and show how the pulses can be shaped to maximize the probability of creating a single exciton using a frequencyswept laser pulse. We also use this theory to propose and analyze methods to determine the phonon density of states experimentally, i.e., phonon spectroscopy, by exploring the dependence of the effective damping rates on the driving field.
Original language  English 

Article number  195306 
Number of pages  11 
Journal  Physical Review. B, Condensed matter and materials physics 
Volume  87 
Issue number  19 
DOIs  
Publication status  Published  15 May 2013 
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Dive into the research topics of 'Lindblad theory of dynamical decoherence of quantumdot excitons'. Together they form a unique fingerprint.Projects
 2 Finished

Topological Protection and NonEquilibriu: Topological Protection and NonEquilibrium States in Strongly Correlated Electron Systems
Wahl, P., Baumberger, F., Davis, J. C., Green, A., Hooley, C., Keeling, J. M. J. & Mackenzie, A.
1/09/11 → 31/08/17
Project: Standard

Macroscopic quantum coherence: Macroscopic quantum coherence in nonequilibrium and driven quantum systems
1/09/10 → 31/03/14
Project: Fellowship