# Fermi surface

## Fermi Surface of Bulk Silicon
This is done with api to Ifermi.

<div align=center>
<img src="https://raw.githubusercontent.com/deepmodeling/DeePTB/main/examples/silicon/property/ifermi/Ifermi_FS.png" width = "52%" height = "50%" alt="Silicon FS" align=center />
<img src="https://raw.githubusercontent.com/deepmodeling/DeePTB/main/examples/silicon/property/ifermi/Ifermi_FS_slice.png" width = "40%" height = "50%" alt="Silicon FS slice" align=center />
</div>




## Fermi Velocity of Bulk Silicon
This is done with api to Ifermi.
<div align=center>
<img src="https://raw.githubusercontent.com/deepmodeling/DeePTB/main/examples/silicon/property/ifermi_velocity/Ifermi_FS_velocity.png" width = "52%" height = "50%" alt="Silicon FS velocity arrow" align=center />
<img src="https://raw.githubusercontent.com/deepmodeling/DeePTB/main/examples/silicon/property/ifermi_velocity/Ifermi_FS_velcoity_slice.png" width = "40%" height = "50%" alt="Silicon FS slice velocity arrow" align=center />
</div>