content_image/330870.jpg content_image/330867.jpg content_image/330868.jpg content_image/330864.jpg content_image/330865.jpg content_image/330866.jpg
<img src='content_image/330870.jpg'>

Eq. (19) can be understood by scaling the Hamiltonian (4) as done in Ref. [14]. Let 

one obtains 

where the dimensionless Hamiltonian ˇ H reads as 

Eq. (21) leads to 

<img src='content_image/330867.jpg'>

<img src='content_image/330868.jpg'>

<img src='content_image/330864.jpg'>

<img src='content_image/330865.jpg'>

<img src='content_image/330866.jpg'>

