~nickpapior/siesta/low-D-stress

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Updated documentation for bond-currents in tbtrans

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Orbital currents are implemented as:

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\begin{equation}

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J_{\alpha \beta} = i [

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\mathbf H_{\beta\alpha} \mathbf A_{\alpha\beta}

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J_{\alpha \beta}(E) = i [

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(\mathbf H_{\beta\alpha} - E\mathbf S_{\beta\alpha}) \mathbf A_{\alpha\beta}(E)

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\mathbf H_{\alpha\beta} \mathbf A_{\beta\alpha}],

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(\mathbf H_{\alpha\beta} - E\mathbf S_{\alpha\beta}) \mathbf A_{\beta\alpha}(E)],

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\end{equation}

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where we have left out the pre-factor ($e/\hbar$)

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intentionally. \sisl\ may be used to analyze the orbital currents