This invited contribution illustrates the theory and application of a first-principle transport methodology employing a basis set obtained directly from the Bloch functions computed with a plane wave (PW) ab-initio solver. We start from a PW density functional theory (DFT) Hamiltonian, use a unitary transformation to real space in the transport direction, and then discuss a basis of Bloch functions enabling a huge reduction of the size of the Hamiltonian blocks and an effective suppression of possible unphysical states. Our methodology enables ab-initio transport simulations with a good computational efficiency, and we here present results for self-consistent simulations of a singlegate monolayer PtSe2 field effect transistor.

Ab-initio quantum transport with a basis of unit-cell restricted Bloch functions and the NEGF formalism

Esseni D.
2020

Abstract

This invited contribution illustrates the theory and application of a first-principle transport methodology employing a basis set obtained directly from the Bloch functions computed with a plane wave (PW) ab-initio solver. We start from a PW density functional theory (DFT) Hamiltonian, use a unitary transformation to real space in the transport direction, and then discuss a basis of Bloch functions enabling a huge reduction of the size of the Hamiltonian blocks and an effective suppression of possible unphysical states. Our methodology enables ab-initio transport simulations with a good computational efficiency, and we here present results for self-consistent simulations of a singlegate monolayer PtSe2 field effect transistor.
978-4-86348-763-5
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11390/1194559
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