  We present results from an analysis looking for dark matter annihilation in
the Sun with the IceCube neutrino telescope. Gravitationally trapped dark
matter in the Sun's core can annihilate into Standard Model particles making
the Sun a source of GeV neutrinos. IceCube is able to detect neutrinos with
energies >100 GeV while its low-energy infill array DeepCore extends this to
>10 GeV. This analysis uses data gathered in the austral winters between May
2011 and May 2014, corresponding to 532 days of livetime when the Sun, being
below the horizon, is a source of up-going neutrino events, easiest to
discriminate against the dominant background of atmospheric muons. The
sensitivity is a factor of two to four better than previous searches due to
additional statistics and improved analysis methods involving better background
rejection and reconstructions. The resultant upper limits on the spin-dependent
dark matter-proton scattering cross section reach down to $1.46\times10^{-5}$
pb for a dark matter particle of mass 500 GeV annihilating exclusively into
$\tau^{+}\tau^{-}$ particles. These are currently the most stringent limits on
the spin-dependent dark matter-proton scattering cross section for WIMP masses
above 50 GeV.
