Table 1 Lorentzian parameters to describe THz conductivity for each phase.

From: Unusual terahertz-wave absorptions in δ/α-mixed-phase FAPbI3 single crystals: interfacial phonon vibration modes

Phase

\(\omega _{0j}/2\pi\) (THz)

\(\Omega _j/2\pi\) (THz)

\(\gamma _j/2\pi\) (THz)

δ-phase

1.7

2.7

0.7

2.5

4.4

1.4

δ/α-mixed phases

1.0

1.2

0.2

1.8

1.2

0.2

2.0

3.3

0.3

2.2

2.9

0.3

2.5

3.0

0.5

α-phase

1.0

2.3

0.2

1.8

4.9

0.9

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