4.1.7. Parameters for time-evolution

• dt

  Type : Positive Double(Default value : 0.1)

  Description : The width of time steps.

• PumpType

  Type : String (Chosen from "Quench", "Pulse Laser", "AC Laser", and "DC Laser".Default value : "Quench")

  Description : The type of time-dependent Hamiltonian. For "Quench", two body operator $U_{\mathrm{q}\mathrm{u}\mathrm{e}\mathrm{n}\mathrm{c}\mathrm{h}}\sum _i{n}_{i\uparrow }{n}_{i\downarrow }$ is added. For "Pulse Laser", "AC Laser", and "DC Laser", the hopping term is modulated as $-\sum _{ij\sigma }{t}_{ij}\exp [-\mathbf{A}(t)\cdot ({\mathbf{R}}_i-{\mathbf{R}}_j)/(2\pi )]c_{i\sigma }^{†}{c}_{j\sigma }$, where $\mathbf{A}(t)$ is the vector potential which is defined as $\mathbf{A}(t)={\mathbf{A}}_0\exp [-(t-t_0{)}^2/(2t_{\mathrm{d}\mathrm{u}\mathrm{m}\mathrm{p}}^2)]\cos [\omega (t-t_0)]$, $\mathbf{A}(t)={\mathbf{A}}_0\sin [\omega (t-t_0)]$, and $\mathbf{A}(t)={\mathbf{A}}_{0}t$ for for "Pulse Laser", "AC Laser", and "DC Laser", respectively.

  potential.dat file is written for displaying the vector potential and the electrical field at each time step.

• Uquench

  Type : Double(Default value : 0.0)

  Description : $U_{\mathrm{q}\mathrm{u}\mathrm{e}\mathrm{n}\mathrm{c}\mathrm{h}}$

• freq

  Type : Double(Default value : 0.1)

  Description : $\omega$

• tshift

  Type : Double(Default value : 0.0)

  Description : $t_0$

• tdump

  Type : Double (Default value : 0.1)

  Description : $t_{\mathrm{d}\mathrm{u}\mathrm{m}\mathrm{p}}$

• VecPotW, VecPotL

  Type : Double (Default value : 0.0)

  Description : The vector potential (fractional coordinate of the reciprocal space) at $t=t_0$. The reciprocal lattice vector is computed from the direct lattice vector shown in Fig. 4.1 , Fig. 4.2 , Fig. 4.3, Fig. 4.4 .