RT Journal Article
T1 Optical pumping of a single hole spin in a p-doped quantum dot coupled to a metallic nanoparticle
A1 Antón Revilla, Miguel Ángel
A1 Carreño Sánchez, Fernando
A1 Melle Hernández, Sonia
A1 Gómez Calderón, Óscar
A1 Cabrera Granado, Eduardo
A1 Singh, Mahi R.
AB The preparation of quantum states with a defined spin is analyzed in a hybrid system consisting of a p-doped  semiconductor quantum dot (QD) coupled to a metallic nanoparticle. The quantum dot is described as a four-level atom-like system using the density matrix formalism. The lower levels are Zeeman-split hole spin states and the upper levels correspond to positively charged excitons containing a spin-up, spin-down hole pair and a spin electron. A metallic nanoparticle with spheroidal geometry is placed in close proximity to the quantum dot, and its effects are considered in the quasistatic approximation. A linearly polarized laser field drives two of the optical transitions of the QD and produces localized surface plasmons in the nanoparticle which act back upon the QD. The frequencies of these localized plasmons are very different along the two principal axes of the nanoparticle, thus producing an anisotropic modification of the spontaneous emission rates of the allowed optical transitions which is accompanied by local-field corrections. This effect translates into a preferential acceleration of some of the optical pathways and therefore into a fast initialization of the QD by excitation with a short optical pulse. The population transfer between the lower levels of the QD and the fidelity is analyzed as a function of the nanoparticle's aspect ratio, the external magnetic field, and the Rabi frequency of the driving field. It is also shown that the main effect of the local-field corrections is a lengthening of the time elapsed to reach the steady-state. The hole spin is predicted to be successfully cooled from 5 to 0.04 K at a magnetic field of 4.6 T applied in the Voigt geometry.
PB American Physical Society
SN 1098-0121
YR 2013
FD 2013-05-07
LK https://hdl.handle.net/20.500.14352/35415
UL https://hdl.handle.net/20.500.14352/35415
LA eng
NO Antón Revilla, M. A., Carreño Sánchez, F., Melle Hernández, S. et al. «Optical Pumping of a Single Hole Spin in a p -Doped Quantum Dot Coupled to a Metallic Nanoparticle». Physical Review B, vol. 87, n.o 19, mayo de 2013, p. 195303. DOI.org (Crossref), https://doi.org/10.1103/PhysRevB.87.195303.
NO Ministerio de Ciencia, Innovación y Universidades (España)
DS Docta Complutense
RD 17 abr 2025