Dephasing in the adiabatic rapid passage in quantum dots: Role of phonon-assisted biexciton generation

TY - JOUR

T1 - Dephasing in the adiabatic rapid passage in quantum dots

T2 - Role of phonon-assisted biexciton generation

AU - Gawarecki, K.

AU - Lüker, S.

AU - Reiter, D.E.

AU - Kuhn, T.

AU - Glässi, M.

AU - Martin Axt, V.

AU - dpz242, dpz242

AU - Machnikowski, P.

PY - 2012/12/3

Y1 - 2012/12/3

N2 - We study the evolution of an exciton confined in a quantum dot adiabatically controlled by a frequency-swept (chirped) laser pulse in the presence of carrier-phonon coupling. We focus on the dynamics induced by a linearly polarized beam and analyze the decoherence due to phonon-assisted biexciton generation. We show that if the biexciton state is shifted down by a few meV, as is typically the case, then the resulting decoherence is strong even at low temperatures. As a result, efficient state preparation is restricted to a small parameter area corresponding to low temperatures, positive chirps, and moderate pulse areas.

AB - We study the evolution of an exciton confined in a quantum dot adiabatically controlled by a frequency-swept (chirped) laser pulse in the presence of carrier-phonon coupling. We focus on the dynamics induced by a linearly polarized beam and analyze the decoherence due to phonon-assisted biexciton generation. We show that if the biexciton state is shifted down by a few meV, as is typically the case, then the resulting decoherence is strong even at low temperatures. As a result, efficient state preparation is restricted to a small parameter area corresponding to low temperatures, positive chirps, and moderate pulse areas.

U2 - 10.1103/PhysRevB.86.235301

DO - 10.1103/PhysRevB.86.235301

M3 - Journal article

SN - 2469-9950

VL - 86

SP - 235301

JO - Physical Review B

JF - Physical Review B

IS - 23

ER -