Abstract
Energetically unstable crystalline surfaces, among their uses, can be templates for the growth of periodic arrays of one-dimensional (1D) nanoscale structures. However, few studies have explored self-assembled faceting on high-index (HI) planes inside the stereographic triangle, and extant studies have not produced any criteria for encouraging the formation of one-dimensional periodic arrays. In this Letter, by analyzing the MBE growth of homoepitaxial facets on (631)A GaAs, a HI plane inside the triangle, we present a criteria to produce highly uniform 1D periodic arrays on unexplored surfaces. These families of planes are those belonging to the lines connecting the energetically stable HI GaAs (11 5 2) plane with any of the (100), (110), and (111) planes at the corners of the stereographic triangle. This novel strategy can lead to new possibilities in self-assembling 1D structures and manipulating physical properties, which in turn may result in new HI- and 1D-based experiments and devices.
Highlights
Unstable crystalline surfaces, which tend to break up into facets of low free energy, can be used as templates for growing nanoscale one-dimensional periodic arrays (1DPAs) such as quantum wires.[1,2,3,4] Ultra-high-vacuum techniques such as molecular beam epitaxy (MBE) and metalorganic vapor phase epitaxy have been used to grow periodic corrugated structures with remarkable uniformity on surfaces with an unstable high Miller index (HI) or vicinal GaAs substrates (VSs).[5,6,7,8] In addition to its potential for promoting self-assembled structures, epitaxial growth on HI substrates has exhibited many interesting features
In this Letter, by analyzing the MBE growth of homoepitaxial facets on (631)A GaAs, a HI plane inside the triangle, we present a criteria to produce highly uniform 1D periodic arrays on unexplored surfaces
This novel strategy can lead to new possibilities in self-assembling 1D structures and manipulating physical properties, which in turn may result in new HI- and 1D-based experiments and devices
Summary
Unstable crystalline surfaces, which tend to break up into facets of low free energy, can be used as templates for growing nanoscale one-dimensional periodic arrays (1DPAs) such as quantum wires.[1,2,3,4] Ultra-high-vacuum techniques such as molecular beam epitaxy (MBE) and metalorganic vapor phase epitaxy have been used to grow periodic corrugated structures with remarkable uniformity on surfaces with an unstable high Miller index (HI) or vicinal GaAs substrates (VSs).[5,6,7,8] In addition to its potential for promoting self-assembled structures, epitaxial growth on HI substrates has exhibited many interesting features. Few studies have explored self-assembled faceting on high-index (HI) planes inside the stereographic triangle, and extant studies have not produced any criteria for encouraging the formation of one-dimensional periodic arrays.
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