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Paolo Umari

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Related publications (6)

Please note that this is not a complete list of this person’s publications. It includes only semantically relevant works. For a full list, please refer to Infoscience.

Koopmans Meets Bethe-Salpeter: Excitonic Optical Spectra without GW

Paolo Umari, Nicola Marzari, Nicola Colonna

The Bethe Salpeter equation (BSE) can be applied to compute from first-principles optical spectra that include the effects of screened electron hole interactions. As input, BSE calculations require single-particle states, quasiparticle energy levels, and t ...

AMER CHEMICAL SOC2019

SIMPLE code: Optical properties with optimal basis functions

Paolo Umari, Nicola Marzari, Gianluca Prandini

We present SIMPLE, a code developed to calculate optical properties of metallic and insulating extended systems using the optimal basis method originally proposed by E.L. Shirley in 1996. Two different approaches for the evaluation of the complex dielectri ...

ELSEVIER SCIENCE BV2019

Gauge Invariance of Thermal Transport Coefficients

Paolo Umari, Aris Marcolongo, Loris Ercole

Thermal transport coefficients are independent of the specific microscopic expression for the energy density and current from which they can be derived through the Green-Kubo formula. We discuss this independence in terms of a kind of gauge invariance resu ...

Springer/Plenum Publishers2016