Electron-blocking and Hole-Blocking Heterojunctions to ...

Electron-blocking and Hole-Blocking Heterojunctions to ...

High Sensitivity EPR with Superconducting Microresonators DMR 0819860
IRG-D: H. Malissa,1 D.I. Schuster, 2 A.M. Tyryshkin,1 A.A. Houck,1 and S.A. Lyon1
1
Princeton Center for Complex Materials (PCCM), 2University of Chicago

Fig. 1 Photograph of a group of superconducting microresonators
(the S-shaped patterns on the right half of the device) etched into a
Nb film. A piece of silicon with a thin, isotopically enriched layer
containing phosphorus donor impurities is mounted over some of
the resonators on the left. The microwave magnetic field extends
about a thousandth of an inch above the resonators, thus probing
only the thin isotopically enriched silicon layer

Electron paramagnetic resonance (EPR) is
commonly used to manipulate and measure
the magnetic moments (or spins) of
electrons. IRG-D researchers at the
Princeton Center for Complex Materials
(PCCM) have demonstrated a 100 fold
improvement in sensitivity to the electrons
spins by combining long-coherence donor
electrons in isotopically enriched silicon
with superconducting Nb microresonators.1
The PCCM researchers have previously
shown that these donor impurities, each
binding one electron, exhibit exceptionally
long quantum coherence. The
microresonators allow them to work with
much smaller numbers of electrons,
especially electrons near surfaces where
they can be employed as qubits in quantum
devices.
1. H. Malissa, et al., Rev. Sci. Instrum. 84, 25116 (2013)
2. A. Tyryshkin, et al., Nature Mater. 11, 143 (2012).

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