Table 1 Exciton fine-structure resonances

From: Stacking angle-tunable photoluminescence from interlayer exciton states in twisted bilayer graphene

θ

XS(eV)

δ (eV)

Δ(eV)

Eb(eV)

Fig. ref. (method)

16.30

2.75

0.16

0.34

0.51

3b (PL)

11.50

2.10

0.37

—

>0.5

1c (PL)

11.20

2.05

0.38

—

>0.5

1c (PL)

7.90

1.55

0.34

0.33

0.69

4b (TA, blue)

7.90

1.55

—

—

0.70

4b (TA, gray)

  1. Three independent methods estimate the exciton binding energy Eb ≅ δ + Δ; the the peak splitting in 2-photon PLE, TA and intraband ESA spectra
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