[Pw_forum] How to construction of Si(100)-2x2 surface :

[泳霆]

How to construction of Si(100)-2x2 surface to calculate :
   
  
Hi :
   
  I aimed to construct a three-layered Si(100)-2x2 size .
   
  but i don't understand how to set up parameters ,
   
  like how much the atoms needs ? how to set up lattice parameter ?
   
  I try to see "al001.rx.in" this example ,
   
  it write in file :
  *****************
&SYSTEM
  ibrav       = 6, 
  celldm(1)   = 5.3033D0,
  celldm(3)   = 8.D0, 
*****************
   
  but, i still don't understand why it should be set up by this way ,
   
  i think , In celldm(1) and celldm(3) , they must have some correlations .
   
  Why it should be to set celldm(1) and celldm(3) ?
   
  In Surface Calculation , whether it can use other way to set up model , or not !?
   
  And , Have any other examples can be understood easily !?
   
   
  request your advise . thank you .

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