In this paper

we study dynamical screening effects in T-shaped semiconductor quantum wire by Green’s Function theory at finite temperature.To clarify dynamical screening effects due to electron-hole plasma

the self-energy of T-shaped semiconductor quantum wire is calculated based on dynamically screened Coulomb potential.The energies of electron and hole

and the relation between the electron and hole energies and cross-section of quantum wire

are discussed.The results show that quasi-one-dimensional system has strong quantum confinement

which enhances the Coulomb interaction among carriers.Due to strong scattering among electrons

large band-gap renormalization effect and finite life-time of electrons are induced by dynamical screening effects.Compared to results by quasi static approximation

we find that holes are less affected by the dynamical screening effects.