, Phys. Rev. X, vol.6, p.11011, 2016.
, J. Mater. Chem. C, vol.5, p.5572, 2017.
, Thin Solid Films, vol.519, p.62190, 2011.
, Phys. Rev. Lett, vol.109, p.76603, 2012.
, Appl. Phys. Lett, vol.89, p.252903, 2006.
, Scientific Reports, vol.5, p.10384, 2015.