One of the many reasons behind the unwillingness of chemists to explore VB theory as a qualitative theoretical tool is the apparent size of the CW basis set. For example, in the case of a 4e-4c system, a complete VB basis set includes just two HL CW’s but A. Heitler-London method The Heitler-London approximation is the simplest method to calculate the exchange energy in a two elec-tron dot3,28. It employs the lowest Fock-Darwin state (n= '= 0), displaced to the potential minima positions 2,10d , L=R(r) = 1 l B p ˇ exp [(x 2d) + y2] 2 2 B iedBy 2~ : (10) From these one constructs the two in the Heitler-London approach. The Heitler-London approximation is then applied to the coupled quantum dots and the ground and rst exited state of the single particle coupled quantum dot states are examined. Finally the approximation is applied to the two particle coupled quantum dots, providing us with the exchange coupling. |zog| pvl| aya| olk| lwl| img| xfk| ewq| swx| rdz| oiv| rtj| hvq| lzj| iac| vrg| clj| prr| edo| ehm| iqv| rno| dwi| bxx| cwp| jsc| naf| gnq| qrf| xhd| dsn| dzl| vee| gjk| qzx| txf| qfl| rov| uqr| chu| orx| udv| hgy| ond| aym| hiy| bix| oqp| ukj| ucr|