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Effects of electronic and lattice polarization on the band-structure of delafossite transparent conductive oxides

Authors: J. Vidal, F. Trani, F. Bruneval, M.A.L. Marques, and S. Botti

Ref.: Phys. Rev. Lett. 104, 136401 (2010)

Abstract: We use hybrid functionals and restricted self-consistent GW, state-of-the-art theoretical approaches for quasiparticle band structures, to study the electronic states of delafossite Cu(Al,In)O₂, the first p-type and bipolar transparent conductive oxides. We show that self-consistent GW gives remarkably wider band gaps than all the other approaches used so far. Accounting for polaronic effects in the GW scheme we recover a very nice agreement with experiments. Furthermore, the modifications with respect to the Kohn-Sham bands are strongly k-dependent, which makes questionable the common practice of using a scissor operator. Finally, our results support the view that the low energy structures found in optical experiments, and initially attributed to an indirect transition, are due to intrinsic defects in the samples.

Citations: 85 (Google scholar)

DOI: 10.1103/PhysRevLett.104.136401

URL: arxiv.org

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Bibtex:

@article{Vidal_2010,
	doi = {10.1103/physrevlett.104.136401},
	url = {https://doi.org/10.1103%2Fphysrevlett.104.136401},
	year = 2010,
	month = {mar},
	publisher = {American Physical Society ({APS})},
	volume = {104},
	number = {13},
	author = {Julien Vidal and Fabio Trani and Fabien Bruneval and Miguel A. L. Marques and Silvana Botti},
	title = {Effects of Electronic and Lattice Polarization on the Band Structure of Delafossite Transparent Conductive Oxides},
	journal = {Physical Review Letters}
}