R. G. Herb Condensed Matter Seminars

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Events on Thursday, February 23rd, 2017

Semi-classical limit for the Schrodinger equation with lattice potential, and band-crossing
Time: 10:00 am
Place: 5310 Chamberlin
Speaker: Qin Li , UW-Madison
Abstract: In this talk we derive and compute the semi-classical limit of the Schrodinger equation with lattice potential. In [Gerard-Markowich-Mauser-Poupaud, Comm. Pure Appl. Math. 1997], the limit is derived under the assumption that energy bands are well-separated, namely, the system is adiabatic. However, in reality, this assumption is generically invalid. We remove the assumption, and obtain a general model by performing multi-scale variable separation with the Bloch decomposition and the Wigner transformation. Asymptotically this new full system recovers the old one in the adiabatic region. In the computation, we decompose the domain into regions depending on the distance to the energy band-crossing points, and apply associated schemes in different regions. A nature extension to the diabatic transition beyond the Born-Oppenheimer approximation will also be given at the end of the talk.
Host: Coppersmith
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