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Submodule esse
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images/tutorials/macroscopically-averaged-potential-lineup.png
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lang/en/docs/properties-directory/scalar/valence-band-offset.json
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{ | ||
"tags": [ | ||
"valence band offset", | ||
"2D materials", | ||
"interface" | ||
] | ||
} |
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lang/en/docs/properties-directory/scalar/valence-band-offset.md
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# Valence Band Offset | ||
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<span class="btn badge b-success border-50">Scalar</span> <span class="btn badge b-info border-50">Electronic</span> | ||
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The valence band offset (VBO) is the energy difference of the valence band edges $\varepsilon_{v}$ across a heterostructure interface. | ||
Note, that the VBO is not simply given by the difference of valence band maxima of the two materials, but also depends | ||
on the electronic distribution at the interface. | ||
![Band offsets at an A/B heterostructure interface](../../images/properties-directory/band-offset.png){: style="width:420px"} | ||
Regarding conduction band edges $\varepsilon_{c}$ there exists an equivalent property, termed conduction band offset (CBO). | ||
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The VBO plays an important role for the transport properties of charge | ||
carriers in heterojunction devices (e.g. hole injection efficiency). Using first principles calculations, the VBO can be | ||
determined through the potential lineup method [^1][^2][^3] or via the local density of states (LDOS) [^3]. For more details | ||
regarding the potential lineup method, see also the [valence band offset tutorial](../../tutorials/dft/electronic/valence-band-offset.md) | ||
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## Example | ||
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Its value can be estimated using the valence band offset [workflow](../../workflows/overview.md), and it is returned under the [Results Tab](../../jobs/ui/results-tab.md) interface with the following appearance (in eV). | ||
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<div class="clearfix" style="text-align:center"> | ||
<div class="chart"><i class="zmdi zmdi-unfold-less zmdi-hc-3x"></i></div> | ||
<div class="count"> | ||
<small>Valence Band Offset</small> | ||
<h2>0.250</h2> | ||
</div> | ||
</div> | ||
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## Schema | ||
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The JSON schema and an example representation for this property can be found [here](../../properties/data/list.md#valence-band-offset). | ||
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## Links | ||
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[^1]: A. Baldereschi, S. Baroni, R. Resta, *Phys. Rev. Lett.* **61**, 734 (1988); DOI: [10.1103/PhysRevLett.61.734](https://www.doi.org/10.1103/PhysRevLett.61.734) | ||
[^2]: L. Colombo, R. Resta, S. Baroni, *Phys. Rev. B* **44**, 5572 (1991); DOI: [10.1103/physrevb.44.5572](https://www.doi.org/10.1103/physrevb.44.5572) | ||
[^3]: M. Peressi, N. Binggeli, A. Baldereschi, *J. Phys. D: Appl. Phys.* **31**, 1273-1299 (1998); DOI: [10.1088/0022-3727/31/11/002](https://www.doi.org/10.1088/0022-3727/31/11/002) | ||
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lang/en/docs/properties-directory/structural/point-group.md
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lang/en/docs/properties-directory/structural/space-group.md
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