Research assistant at the Research Laboratory for Crystal Physics of the Hungarian Academy of Sciences (HAS), Budapest, Hungary, 1992-1998. Visiting postdoctoral researcher at the Department of Chemistry, University Antwerp, Belgium, 2001-2003 (1.5 years), 2004-2007 (4-times 3 months), 2008-2011 (32 months). Research fellow at the Research Institute for Solid State Physics and Optics of the HAS, Budapest, Hungary, 1998-2011. Senior researcher at Wigner Research Centre for Physics of the HAS, 2012-2019. Scientific advisor at Wigner Research Centre for Physics of the HAS, 2019-present.