Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Rapidly enhanced spin polarization injection in an optically pumped spin
  ratchet   Rapid injection of spin polarization into an ensemble of nuclear spins is a
problem of broad interest, spanning dynamic nuclear polarization (DNP) to
quantum information science. We report on a strategy to boost the spin
injection rate by exploiting electrons that can be rapidly polarized via
high-power optical pumping. We demonstrate this in a model system of Nitrogen
Vacancy center electrons injecting polarization into a bath of 13C nuclei in
diamond. We innovate an apparatus with thirty lasers to deliver >20W of
continuous, nearly isotropic, optical power to the sample with only a minimal
temperature increase. This constitutes a substantially higher power than in
previous experiments, and through a spin-ratchet polarization transfer
mechanism, yields boosts in spin injection rates by over two orders of
magnitude. Our experiments also elucidate speed-limits of nuclear spin
injection that are individually bottlenecked by rates of electron polarization,
polarization transfer to proximal nuclei, and spin diffusion. This work
demonstrates opportunities for rapid spin injection employing non-thermally
generated electron polarization, and has relevance to a broad class of
experimental systems including in DNP, quantum sensing, and spin-based MASERs.

37
The categories of this paper are: supr-con
16
The categories of this paper are: stat
8
The categories of this paper are: hep-ex
7
The categories of this paper are: hep-th
32
The categories of this paper are: atom-ph
20
The categories of this paper are: acc-phys
26
The categories of this paper are: bayes-an
12
The categories of this paper are: nucl-th
2
The categories of this paper are: math
6
The categories of this paper are: astro-ph
14
The categories of this paper are: math-ph
27
The categories of this paper are: comp-gas
5
The categories of this paper are: gr-qc
33
The categories of this paper are: plasm-ph
29
The categories of this paper are: funct-an
31
The categories of this paper are: ao-sci