TY  - JOUR
AU  - Šimėnas, Mantas
AU  - O’Sullivan, James
AU  - Kennedy, Oscar W.
AU  - Lin, Sen
AU  - Fearn, Sarah
AU  - Zollitsch, Christoph W.
AU  - Dold, Gavin
AU  - Schmitt, Tobias
AU  - Schüffelgen, Peter
AU  - Liu, Ren-Bao
AU  - Morton, John J. L.
TI  - Near-Surface Te + 125 Spins with Millisecond Coherence Lifetime
JO  - Physical review letters
VL  - 129
IS  - 11
SN  - 0031-9007
CY  - College Park, Md.
PB  - APS
M1  - FZJ-2023-01208
SP  - 117701
PY  - 2022
AB  - Impurity spins in crystal matrices are promising components in quantum technologies, particularly if they can maintain their spin properties when close to surfaces and material interfaces. Here, we investigate an attractive candidate for microwave-domain applications, the spins of group-VI 125Te+ donors implanted into natural Si at depths as shallow as 20 nm. We show that surface band bending can be used to ionize such near-surface Te to spin-active Te+ state, and that optical illumination can be used further to control the Te donor charge state. We examine spin activation yield, spin linewidth, and relaxation (T1) and coherence times (T2) and show how a zero-field 3.5 GHz “clock transition” extends spin coherence times to over 1 ms, which is about an order of magnitude longer than other near-surface spin systems.
LB  - PUB:(DE-HGF)16
C6  - 36154421
UR  - <Go to ISI:>//WOS:000865935700013
DO  - DOI:10.1103/PhysRevLett.129.117701
UR  - https://juser.fz-juelich.de/record/999174
ER  -