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Finite temperature results in various effects on the properties of nuclearstructure and excitations of relevance for nuclear processes in hot stellarenvironments. Here we introduce the self-consistent finite temperaturerelativistic quasiparticle random phase approximation (FT-RQRPA) based onrelativistic energy density functional with point coupling interaction fordescribing the temperature effects in electric dipole (E1) transitions. Weperform a study of E1 excitations in the temperature range $T=$ 0-2 MeV for theselected closed- and open-shell nuclei ranging from $^{40}$Ca to $^{60}$Ca and$^{100}$Sn to $^{140}$Sn by including both thermal and pairing effects. Theisovector giant dipole resonance strength is slightly modified for theconsidered range of temperature, while new low-energy peaks emerge for $E<$12MeV with non-negligible strength in neutron-rich nuclei at high temperatures.The analysis of relevant two-quasiparticle configurations discloses how newexcitation channels open due to thermal unblocking of states at finitetemperature. The study also examines the isospin and temperature dependence ofelectric dipole polarizability ($\alpha_D$), resulting in systematic increasein the values of $\alpha_D$ with increasing temperature, with a more pronouncedeffect observed in neutron-rich nuclei. The FT-RQRPA introduced in this workwill open perspectives for microscopic calculation of $\gamma$-ray strengthfunctions at finite temperatures relevant for nuclear reaction studies.

Electric dipole transitions in the relativistic quasiparticle random phase approximation at finite temperature