MRS Meetings and Events

 

EL02.06.06 2024 MRS Spring Meeting

Erbium Spin Defects in Colloidal Ceria Nanocrystals with Near Microsecond Spin Coherence

When and Where

Apr 25, 2024
11:00am - 11:15am

Room 347, Level 3, Summit

Presenter

Co-Author(s)

Joeson Wong1,2,Arashdeep Thind3,Jasleen Bindra2,Jiefei Zhang2,Gregory Grant2,1,Christina Wicker1,Yuxuan Zhang1,Jens Niklas2,Oleg Poluektov2,Robert Klie3,F. Joseph Heremans2,1,David Awschalom1,2,Paul Alivisatos1

The University of Chicago1,Argonne National Laboratory2,University of Illinois at Chicago3

Abstract

Joeson Wong1,2,Arashdeep Thind3,Jasleen Bindra2,Jiefei Zhang2,Gregory Grant2,1,Christina Wicker1,Yuxuan Zhang1,Jens Niklas2,Oleg Poluektov2,Robert Klie3,F. Joseph Heremans2,1,David Awschalom1,2,Paul Alivisatos1

The University of Chicago1,Argonne National Laboratory2,University of Illinois at Chicago3
We experimentally demonstrate spin coherence times approaching a microsecond in erbium doped ceria nanocrystals with an ensemble average level of a single erbium per nanocrystal. To achieve these spin coherence times, ceria was chosen as a host material with a low natural abundance of nuclear spins. As a result, we observe population lifetimes that approach a millisecond, suggesting substantial improvements to the spin coherence should be possible. We postulate that the spin coherence is limited by the nuclear spin bath of hydrogen atoms from the oleic acid ligands on the surface of the nanocrystal. Quantum beats are observed which correspond to the Larmor frequency of hydrogen, which further suggests the erbium ions are sensitive to the nearby hydrogen nuclei. Scanning transmission electron microscopy measurements combined with electron energy loss spectroscopy further show that Ce<sup>3+</sup> and O vacancies are prevalent on the surface of the nanocrystal, likely playing a role in the observed spin coherence and lifetime. Nonetheless, the spin coherence already demonstrated suggests that spin defects in nanocrystals are a promising materials platform for quantum information processing.

Keywords

nanoscale

Symposium Organizers

Yunping Huang, CU Boulder
Hao Nguyen, University of Washington
Nayon Park, University of Washington
Claudia Pereyra, University of Pennsylvania

Publishing Alliance

MRS publishes with Springer Nature