2D Hexagonal SnTe monolayer: a quasi direct band gap semiconductor with strain sensitive electronic and optical propertiesNegin Fatahi, D.M. Hoat, Amel Laref, Shorin Amirian, A.H. Reshak and Mosayeb NaseriEur. Phys. J. B, 93 2 (2020) 32DOI: https://doi.org/10.1140/epjb/e2020-100543-6