Interacting quantum box superlattice by self-organized Co nanodots on Au(788)

C. Didiot (1) , A. Tejeda (2) , Y. Fagot-Revurat (1) , V. Repain (2) , B. Kierren (1) , S. Rousset (2) , D. Malterre (1)

1 LPM - Laboratoire de physique des matériaux
2 MPQ (UMR_7162) - Laboratoire Matériaux et Phénomènes Quantiques

Noble metals exhibit a Shockley state that can be confined in one direction due to the interaction with steps in vicinal surfaces. We observe here that self-organized Co islands on Au(788) can also confine the surface state to the orthogonal direction. The two-dimensional confinement of the surface state is studied by scanning tunneling spectroscopy as well as photoemission. Several confined states are revealed by the standing-wave pattern which appears between the Co nanodots. The band dispersion shows the opening of three gaps. These gaps report on the magnitude of the surface potential, which is drastically different from that of the Au substrate. These results show how self-organization modulates the electronic potential, leading to a periodical confinement of the surface state.

Domaines: Physique [physics]

C. Didiot, A. Tejeda, Y. Fagot-Revurat, V. Repain, B. Kierren, et al.. Interacting quantum box superlattice by self-organized Co nanodots on Au(788). Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2007, 76 (8), ⟨10.1103/PhysRevB.76.081404⟩. ⟨hal-01987585⟩