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Academic Test / 学术测试

2026-09-20

This is a test post for academic notes.

Inline mathematics: $e^{i\pi}+1=0$.

Displayed mathematics:

\[H=-t\sum_{\langle i,j\rangle,\sigma} \left(c^\dagger_{i\sigma}c_{j\sigma}+\mathrm{h.c.}\right) +U\sum_i n_{i\uparrow}n_{i\downarrow}.\]

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Stable Topology in Exactly Flat Bands (PDF)