What does this notation mean?
$$ |i\rangle \langle j |$$
Source of equation: Understanding the Physics Behind Topological Insulators Through Su-Schrieffer-Heeger Model (https://arxiv.org/abs/1906.08435)
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6It is the "bra-ket" notation. Google it. – David G. Stork Jun 28 '21 at 01:07
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Wikipedia has it here: https://en.wikipedia.org/wiki/Bra%E2%80%93ket_notation – bjcolby15 Jun 28 '21 at 01:10
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You can find a very good description of bra-ket notation here – Chris Grossack Jun 28 '21 at 01:14