  Hawking radiation from black hole horizon can be viewed as a quantum
tunnelling process, and fermions via tunnelling can successfully recover
Hawking temperature. In this paper, considering the tunnelling particles with
spin 1/2 (namely, Dirac particles), we further improve Kerner and Man's fermion
tunnelling method to study Hawking radiation via tunnelling from rotating black
holes in de Sitter spaces, specifically including that from Kerr de Sitter
black hole and Kerr-Newman de Sitter black hole. As a result, Hawking
temperatures at the event horizon (EH) and the cosmological horizon (CH) are
well described via Dirac particles tunnelling.
