Hey there Muhamad Hazim Ahmad Ghazali! Sure thing, I've got you Muhamad Hazim Ahmad Ghazali covered. Here's a snippet of Silvaco code for a Graphene Field Effect Transistor (GFET) simulation:

```silvaco

# GFET Simulation

# Material Definitions

material graphene

mobility = 2000

density = 1e13

temperature = 300

conductivity = 2.5e-5

eps = 0.1

tref = 300

mstar = 0.2

mumin = 2000

bfield = 0.05

contact mumin

# Mesh Definitions

mesh x 1.0e-9

# Device Definitions

device gfet

substrate SiO2

top_contact metal

bottom_contact metal

material graphene

length = 100e-9

width = 50e-9

thickness = 1e-9

doping n 1e17

# Simulation Settings

solve init

solve equilibrium

solve balance

solve dc vds = 0 1 0.1 vgs = 0 1 0.1

# Output

output current_vgs_vds

```

This code sets up a basic GFET simulation, defining the material properties, mesh, device parameters, and simulation settings. You Muhamad Hazim Ahmad Ghazali can tweak these parameters according to your specific requirements.

Feel free to give it a try and let me know if you Muhamad Hazim Ahmad Ghazali need any further assistance or clarification! Happy simulating!