Your browser doesn't support javascript.
loading
Measurement of the spin temperature of optically cooled nuclei and GaAs hyperfine constants in GaAs/AlGaAs quantum dots.
Chekhovich, E A; Ulhaq, A; Zallo, E; Ding, F; Schmidt, O G; Skolnick, M S.
Afiliación
  • Chekhovich EA; Department of Physics and Astronomy, University of Sheffield, Sheffield S3 7RH, UK.
  • Ulhaq A; Department of Physics and Astronomy, University of Sheffield, Sheffield S3 7RH, UK.
  • Zallo E; School of Science and Engineering, Lahore University of Management Sciences (LUMS), Sector U, D.H.A, Lahore 54792, Pakistan.
  • Ding F; Institute for Integrative Nanoscience, IFW Dresden, Helmholtz str. D-01069, Dresden, Germany.
  • Schmidt OG; Paul-Drude-Institut für Festkörperelektronik, Hausvogteiplatz 5-7, 10117 Berlin, Germany.
  • Skolnick MS; Institute for Integrative Nanoscience, IFW Dresden, Helmholtz str. D-01069, Dresden, Germany.
Nat Mater ; 16(10): 982-986, 2017 10.
Article en En | MEDLINE | ID: mdl-28783160
Deep cooling of electron and nuclear spins is equivalent to achieving polarization degrees close to 100% and is a key requirement in solid-state quantum information technologies. While polarization of individual nuclear spins in diamond and SiC (ref. ) reaches 99% and beyond, it has been limited to 50-65% for the nuclei in quantum dots. Theoretical models have attributed this limit to formation of coherent 'dark' nuclear spin states but experimental verification is lacking, especially due to the poor accuracy of polarization degree measurements. Here we measure the nuclear polarization in GaAs/AlGaAs quantum dots with high accuracy using a new approach enabled by manipulation of the nuclear spin states with radiofrequency pulses. Polarizations up to 80% are observed-the highest reported so far for optical cooling in quantum dots. This value is still not limited by nuclear coherence effects. Instead we find that optically cooled nuclei are well described within a classical spin temperature framework. Our findings unlock a route for further progress towards quantum dot electron spin qubits where deep cooling of the mesoscopic nuclear spin ensemble is used to achieve long qubit coherence. Moreover, GaAs hyperfine material constants are measured here experimentally for the first time.
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Tipo de estudio: Prognostic_studies Idioma: En Revista: Nat Mater Asunto de la revista: CIENCIA / QUIMICA Año: 2017 Tipo del documento: Article Pais de publicación: Reino Unido
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Tipo de estudio: Prognostic_studies Idioma: En Revista: Nat Mater Asunto de la revista: CIENCIA / QUIMICA Año: 2017 Tipo del documento: Article Pais de publicación: Reino Unido