TY - JOUR
T1 - A Hybrid Method for Computing the Schrodinger Equations with Periodic Potential with Band-Crossings in the Momentum Space
AU - Chai, Lihui
AU - Jin, Shi
AU - Markowich, Peter A.
N1 - KAUST Repository Item: Exported on 2021-07-08
PY - 2018
Y1 - 2018
N2 - We propose a hybrid method which combines the Bloch decomposition-based time splitting (BDTS) method and the Gaussian beam method to simulate the Schrödinger equation with periodic potentials in the case of band-crossings. With the help of the Bloch transformation, we develop a Bloch decomposition-based Gaussian beam (BDGB) approximation in the momentum space to solve the Schrödinger equation. Around the band-crossing a BDTS method is used to capture the inter-band transitions, and away from the crossing, a BDGB method is applied in order to improve the efficiency. Numerical results show that this method can capture the inter-band transitions accurately with a computational cost much lower than the direct solver. We also compare the Schrödinger equation with its Dirac approximation, and numerically show that, as the rescaled Planck number ε→0, the Schrödinger equation converges to the Dirac equations when the external potential is zero or small, but for general external potentials there is an O(1) difference between the solutions of the Schrödinger equation and its Dirac approximation.
AB - We propose a hybrid method which combines the Bloch decomposition-based time splitting (BDTS) method and the Gaussian beam method to simulate the Schrödinger equation with periodic potentials in the case of band-crossings. With the help of the Bloch transformation, we develop a Bloch decomposition-based Gaussian beam (BDGB) approximation in the momentum space to solve the Schrödinger equation. Around the band-crossing a BDTS method is used to capture the inter-band transitions, and away from the crossing, a BDGB method is applied in order to improve the efficiency. Numerical results show that this method can capture the inter-band transitions accurately with a computational cost much lower than the direct solver. We also compare the Schrödinger equation with its Dirac approximation, and numerically show that, as the rescaled Planck number ε→0, the Schrödinger equation converges to the Dirac equations when the external potential is zero or small, but for general external potentials there is an O(1) difference between the solutions of the Schrödinger equation and its Dirac approximation.
UR - http://hdl.handle.net/10754/670043
UR - http://www.global-sci.com/intro/article_detail/cicp/12315.html
U2 - 10.4208/cicp.2018.hh80.01
DO - 10.4208/cicp.2018.hh80.01
M3 - Article
SN - 1991-7120
VL - 24
SP - 989
EP - 1020
JO - Communications in Computational Physics
JF - Communications in Computational Physics
IS - 4
ER -