Femtosecond electron diffraction: Preparation and characterization of (110)-oriented bismuth films

• Moriena, Gustavo

• Hada, Masaki

• Sciaini, German

• Matsuo, Jiro

• Miller, R. J. Dwayne

抄録

Here, we present a new approach to synthesize (110)-oriented ultrathin membranes of bismuth (Bi). This rather exotic orientation was achieved by directing the growth through rationale control of lattice matching. Bi films were hetero-epitaxially grown on the (100)-surface of freshly cleaved potassium chloride crystals. The sample orientation was characterized by x-ray and electron diffraction. In addition, high quality free-standing films were obtained after dissolution of the substrate in water and controlled evaporation. Femtosecond electron diffraction (FED) was, therefore, used to monitor the coherent shear acoustic phonons in (110)-oriented free-standing Bi films produced by impulsive femtosecond optical excitation. The small de Broglie wavelength (flat Ewald sphere) of keV-electrons combined with an off-Bragg detection scheme provided a magnified view of shear atomic motions, i.e., lattice distortions in the transverse direction. All-optical pump-probe experiments are usually insensitive to shear displacements, a fact that makes FED a unique non-contact method to achieve the complete characterization of elastic properties of nanoscale materials.

収録刊行物

• JOURNAL OF APPLIED PHYSICS

  JOURNAL OF APPLIED PHYSICS 111 (4), 2012-02-15

  American Institute of Physics

キーワード

• bismuth
• electron diffraction
• epitaxial growth
• membranes
• metallic epitaxial layers
• phonons
• wave mechanics
• X-ray diffraction

詳細情報

• CRID: 1050282810716608000
• NII論文ID: 120004920373
• NII書誌ID: AA00693547
• ISSN: 00218979
• HANDLE: 2433/160655
• 本文言語コード: en
• 資料種別: journal article
• データソース種別:
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  • CiNii Articles