Bipolaronic insulator on alkali/Si(111):B-2√3×2√3R30° interfaces - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Physical Review B Année : 2010

Bipolaronic insulator on alkali/Si(111):B-2√3×2√3R30° interfaces

Cédric Tournier-Colletta
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Luis Alfonso Cardenas Arellano
Yannick Fagot-Revurat
Bertrand Kierren
Antonio Tejeda
Daniel Malterre
Patrick Le Fèvre
François Bertran
Amina Taleb-Ibrahimi

Résumé

In this paper, we present a systematic study of the structural and electronic properties of the alkali/Si(111):B interface, combining low-energy electron diffraction and (angle-resolved) photoemission spectroscopy. We show that potassium (K), rubidium (Rb), and caesium (Cs) ultrathin films, including solid solutions K-Rb, share the same physics. First of all, the 2√3×2√3R30° surface reconstruction, evidenced only very recently using potassium is shown to be a common feature at the saturation coverage. A 3×3 reconstruction is also observed for coverages just below saturation. From an electronic point of view, the band features found with K are generalized. As a distinct point, we evidence that the surface state is constituted by two subbands which have the reconstruction symmetry. At low temperature (55 K), a systematic shift of the surface state toward higher binding energies is observed together with a reduction of its linewidth. A close inspection of the data reveals fine, systematic effects depending on the alkali. Indeed as substituting from K to Cs, the surface-state binding energy is reduced continuously whereas the bandwidth increases. K differs from Rb and Cs, by a smaller reduction of the linewidth and a higher energy shift upon cooling. These features are interpreted consistently within the bipolaron model, which was invoked previously to explain the insulating nature of the K/Si:B surface state. Polaronic effects are shown to be enhanced with K, as already demonstrated on alkali/GaAs(110) interfaces.
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Dates et versions

hal-04224925 , version 1 (05-10-2023)

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Cédric Tournier-Colletta, Luis Alfonso Cardenas Arellano, Yannick Fagot-Revurat, Bertrand Kierren, Antonio Tejeda, et al.. Bipolaronic insulator on alkali/Si(111):B-2√3×2√3R30° interfaces. Physical Review B, 2010, 82 (16), pp.165429. ⟨10.1103/PhysRevB.82.165429⟩. ⟨hal-04224925⟩
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