[Pw_forum] Sawlike potential - clarification

Konstantin Kudin konstantin_kudin at yahoo.com
Tue Aug 31 04:01:10 CEST 2004

 Hi all,

 "INPUT_PW" says the following on adding sawlike potential:

"emaxpos        REAL ( default = 0.5D0 )
               Position of the maximum of the sawlike potential within
               unit cell ( 0 < emaxpos < 1 )

eopreg         REAL( default = 0.1D0 )
               Part of the unit cell where the sawlike potential
               ( 0 < eopreg < 1 )

eamp           REAL ( default = 0.001 a.u. )
               Amplitude of the electric field (in a.u.) 
	       ( 1 a.u. = 51.44 10^10 V/m )"

 What does "Part of the unit cell where the sawlike potential
decreases" really mean? Is that where the sawlike potential is at its

 Also, are there any drawbacks in using a highly asymmetric saw tooth?
For example, is it a good idea to have a narrow region where the
potential drops from highest to lowest, and then a wide region where it

 If asymmetric saw tooth is OK, then what does "eamp" set? Is it the
field in the longer part of the tooth, or in the shorter one?

 Thanks in advance!

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