How to consider electron-photon interaction w/o using self-energy?

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Hi, In negf, interactions are considered as self-energies. For electron-photon interaction, a perturbation Hamiltonian is derived and then self-energy is found using coupled-field theory. Now, my …

http://nanohub.org/answers/question/799

Sign of imaginary part of self-energy for hole Hamiltonian

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Prof Datta in his QTAT Exercise Ch8, discusses that the imaginary part of the contact self-energy should be negative while the real part will tend towards zero for large energies in both directions. …

http://nanohub.org/answers/question/575

how do we impose G<(x,x) to be pure immaginary?

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According to Kadanoff-Baym book, formula (2-2), one has: = -i G

http://nanohub.org/answers/question/254

NEGF Formulism Question

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Hi, I'm not too familiar with the NEGF formalism. But had a very basic question. I've read that NEGF can be viewed as a "Quantum Boltzmann Equation". When taking moments of the classical …

http://nanohub.org/answers/question/8

Time-dependent NEGF

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In the time-dependent NEGF equation, given a sigma_in(t,t') due to the dot, I am getting an I-V equation that is making it difficult for me to group terms. For instance, looking at the analogue of …

http://nanohub.org/answers/question/6

Quantum dots

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What I want to do is building an aluminum quantum dot coupled to aluminum leads to observe Coulomb Blockade. To form the tunnel barriers we oxidize the Al in a plasma without any detailed knowledge …

http://nanohub.org/answers/question/2