QuantumATK Forum

QuantumATK => General Questions and Answers => Topic started by: Parveen on October 14, 2018, 10:22

Title: Charge transfer mechanism through bunch of ghost atoms
Post by: Parveen on October 14, 2018, 10:22

What is the charge transfer mechanism that is followed in ghost atoms in M-I-S-M device structure? That is Metal- Insulator- Space(ghost atoms)- Metal devices. Is it any kind of tunneling like direct/FN or charge hopping?

Title: Re: Charge transfer mechanism through bunch of ghost atoms
Post by: Petr Khomyakov on October 14, 2018, 16:12

Ghost atoms are supposed to correct for wave function tail in the vacuum region, because the localized basis functions are short-range in QuantumATK. The ghost atoms provide atomic orbitals in the vacuum that can accommodate some charge. This charge decay quickly into the vacuum region.

Since the ghost atoms are in the vacuum, they give some correction to quantum, coherent tunneling of charge carriers through the vacuum spacer. 
Having the ghost atoms has nothing to do with hopping mechanism for the electron transport.