Electronic structure and surface-mediated metastability of Bi films on Si(111)- 7×7 studied by angle-resolved photoemission spectroscopy

G. Bian; T. Miller; T. C. Chiang

doi:10.1103/PhysRevB.80.245407

Electronic structure and surface-mediated metastability of Bi films on Si(111)- 7×7 studied by angle-resolved photoemission spectroscopy

G. Bian, T. Miller, T. C. Chiang

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42 Scopus citations

Abstract

We have observed using angle-resolved photoemission a structural phase transformation of Bi films deposited on Si(111)- 7×7. Films with thicknesses 20 to ∼100Å, upon annealing, first order into a metastable pseudocubic (PC) phase and then transform into a stable rhombohedral (RH) phase with very different topologies for the quantum-well subband structures. The PC phase shows a surface band with a maximum near the Fermi level at Γ̄, whereas the RH phase shows a Dirac-like subband around M̄ along K̄ - M̄ - K̄. The formation of the metastable phase over a wide thickness range can be attributed to a surface nucleation mechanism.

Original language	English
Article number	245407
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	80
Issue number	24
DOIs	https://doi.org/10.1103/PhysRevB.80.245407
State	Published - Dec 7 2009
Externally published	Yes

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title = "Electronic structure and surface-mediated metastability of Bi films on Si(111)- 7×7 studied by angle-resolved photoemission spectroscopy",

abstract = "We have observed using angle-resolved photoemission a structural phase transformation of Bi films deposited on Si(111)- 7×7. Films with thicknesses 20 to ∼100{\AA}, upon annealing, first order into a metastable pseudocubic (PC) phase and then transform into a stable rhombohedral (RH) phase with very different topologies for the quantum-well subband structures. The PC phase shows a surface band with a maximum near the Fermi level at {\=Γ}, whereas the RH phase shows a Dirac-like subband around {\=M} along {\=K} - {\=M} - {\=K}. The formation of the metastable phase over a wide thickness range can be attributed to a surface nucleation mechanism.",

author = "G. Bian and T. Miller and Chiang, {T. C.}",

year = "2009",

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doi = "10.1103/PhysRevB.80.245407",

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AU - Bian, G.

AU - Miller, T.

AU - Chiang, T. C.

PY - 2009/12/7

Y1 - 2009/12/7

N2 - We have observed using angle-resolved photoemission a structural phase transformation of Bi films deposited on Si(111)- 7×7. Films with thicknesses 20 to ∼100Å, upon annealing, first order into a metastable pseudocubic (PC) phase and then transform into a stable rhombohedral (RH) phase with very different topologies for the quantum-well subband structures. The PC phase shows a surface band with a maximum near the Fermi level at Γ̄, whereas the RH phase shows a Dirac-like subband around M̄ along K̄ - M̄ - K̄. The formation of the metastable phase over a wide thickness range can be attributed to a surface nucleation mechanism.

AB - We have observed using angle-resolved photoemission a structural phase transformation of Bi films deposited on Si(111)- 7×7. Films with thicknesses 20 to ∼100Å, upon annealing, first order into a metastable pseudocubic (PC) phase and then transform into a stable rhombohedral (RH) phase with very different topologies for the quantum-well subband structures. The PC phase shows a surface band with a maximum near the Fermi level at Γ̄, whereas the RH phase shows a Dirac-like subband around M̄ along K̄ - M̄ - K̄. The formation of the metastable phase over a wide thickness range can be attributed to a surface nucleation mechanism.

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VL - 80

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JF - Physical Review B - Condensed Matter and Materials Physics

IS - 24

M1 - 245407

ER -

Electronic structure and surface-mediated metastability of Bi films on Si(111)- 7×7 studied by angle-resolved photoemission spectroscopy

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