Electron–phonon coupling in copper intercalated Bi $$_{2}$$ 2 Se $$_{3}$$ 3

Abstract We report charge and heat transport studies in copper-intercalated topological insulator Bi $$_2$$ 2 Se $$_3$$ 3 hybrid devices. Measured conductivity shows impact of quantum corrections, electron–electron and electron–phonon interactions. Our shot noise measurements reveal that heat flux displays a crossover between $$T^2$$ T 2 and $$T^4$$ T 4 with the increase of temperature. The results might be explained by a model of inelastic electron scattering on disorder, increasing the role of transverse acoustic phonons in the electron–phonon coupling process.