Transient Dynamics Through a Magnetic Tunnel Junction
Ch. Narasimha Raju1*, Sung-Po Chao1
1Physics Department, National Kaohsiung Normal University, Kaohsiung, Taiwan
* Presenter:Ch. Narasimha Raju
We present a model study on the time-dependent charge transport through a magnetic tunnel junction. Magnetic fluctuation in the central region of the tunnel junctions is modelled as magnons, and its influence on the tunneling is treated as a local bosonic mode described by the spinless Anderson-Holstein model. Using Keldysh nonequilibrium Green’s function we compute the time dependent current with various type of source drain bias. Dressed tunneling approximation is used to handle the strong electron-magnon or other bosonic modes interaction. We analyze the phase diagram of the transient time as a function of different parameters of the model system, and explore the regions for fast switching which is useful for device making.

Keywords: time-dependent charge transport, magnons, spinless Anderson-Holstein model, Keldysh nonequilibrium Green’s function method, transient time