Extended Data Table 2 Comparison of Born effective charges

From: Born effective charges and vibrational spectra in superconducting and bad conducting metals

  1. This table collects the values of BECs obtained as described in Supplementary Section VIII for the \(Im\bar{3}m\) phase of H3S at 150 GPa. The cubic symmetry of the crystal implies that only three components of the BEC tensors are independent: one for the sulfur atom (ZS) and two for the H-atom, corresponding respectively to the ion displacement along the H − S bond (\({Z}_{\parallel }^{H}\)) or perpendicular to it (\({Z}_{\perp }^{H}\)). We list BECs in the dynamic and static limits as well as their values at the phonon frequencies of ω1 = 84 and ω2 = 148 meV, comparing undamped \({\bar{Z}}_{s,\alpha \beta }^{{{{\rm{Dyn}}}}}({\omega }_{\mu })\) with damped \({\bar{Z}}_{s,\alpha \beta }({\omega }_{\mu },{\Sigma }^{{{{\rm{el}}}}})\) BECs that include self-energy effects via equation (7). Damped BECs are evaluated both in the normal (T=300K) and SC (T=20K) state. Notice that \(Im{\bar{Z}}_{s,\alpha \beta }({\omega }_{1},{\Sigma }^{{{{\rm{el}}}}},20K) \sim 0\).
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