MAGNETOABSORPTION OF LARGE BIPOLARONS

The magnetoabsorption of large bipolarons is investigated using the pa th-integral method. The response of a bipolaron in a magnetic field to an external electromagnetic field is derived from a generalized aniso tropic modeling influence phase in the framework of the memory-functio n approach. The resulting magnetoabsorption spectrum of large bipolaro ns is presented for several values of the magnetic held. A general fea ture is that this spectrum consists of a series of relatively narrow p eaks. The peculiarities of the magnetoabsorption spectrum of the bipol aron as a function of the frequency of the electromagnetic field are a ttributed to the transitions involving scattering states of a bipolaro n. The shape of the magnetoabsorption spectrum, due to free polarons a t lower magnetic fields, drastically changes at higher magnetic fields where bipolarons are stable.