Substitutional doping of Cu in diamond: Mott physics with $p$ orbitals

H. Hassanian Arefi; S. A. Jafari; M. R. Abolhassani

doi:10.1140/epjb/e2010-00268-1

paper

Substitutional doping of Cu in diamond: Mott physics with $p$ orbitals

arXiv:1004.1103 · doi:10.1140/epjb/e2010-00268-1

Abstract

Discovery of superconductivity in the impurity band formed by heavy doping of boron into diamond (C:B) as well as doping of boron into silicon (Si:B) has provided a rout for the possibility of new families of superconducting materials. Motivated by the special role played by copper atoms in high temperature superconducting materials where essentially Cu $d$ orbitals are responsible for a variety of correlation induced phases, in this paper we investigate the effect of substitutional doping of Cu into diamond. Our extensive first principle calculations averaged over various geometries based on density functional theory, indicates the formation of a mid-gap band, which mainly arises from the $t_{2 g}$ and $4 p$ states of Cu. For impurity concentrations of more than $\sim 1$ 2p $ban d so f n e i g hb or in g c a r b o na t o m sc anb e i g n or e d . B a se d o n o u r d e t ai l e d ana l y s i s, w es ug g es t a tw o ban d m o d e l f or t h e mi d - g a p s t a t esco n s i s t in g o f a q u a r t er - f i l l e d h o l e l ik e$ t_{2g} $ban d, an d aha l f - f i l l e d ban d o f$ 4p $s t a t es . I n cr e a s in g t h eco n ce n t r a t i o n o f t h e C u im p u r i t y b ey o n d$ \sim 5%, completely closes the spectral gap of the host diamond.

arXiv comment5 figures

Substitutional doping of Cu in diamond: Mott physics with p orbitals

Abstract

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Substitutional doping of Cu in diamond: Mott physics with $p$ orbitals