Fig. 1
From: Scaling law for excitons in 2D perovskite quantum wells
Exciton reduced mass from magneto-absorption spectroscopy and theory. a Schematic of the RPP structure cut along the direction ĉ of stacking of the 2D layers. b Image of mechanically exfoliated RPP crystals. Scale bar is 10 µm. c Magnetic field dependence of the light transmission of an individual RPP with n equals to 4 crystal for right- (σ‒) and left-handed (σ+) circular polarization. d Corresponding shift of the exciton energy as a function of the magnetic field. Fit of the data using ΔE = ±1/2 g0μBB + c0B2 yields c0 = 1.04 ± 0.16 µeV T−2 and g0 = 1.59 ± 0.03. e Derived diamagnetic shift coefficient of the measured RPPs (red squares). The value from Tanaka et al.15 is also reported for RPPs with n equals to 1 with a slightly larger organic spacer. f Exciton reduced mass derived from fitting the diamagnetic shifts with our theoretical model. The gray dotted line is a guide for the eyes. The red dashed line indicates average value of exciton reduced mass for the 3D perovskite MAPbI3. Error bars correspond to s.d. from the fit of the shift of the exciton energy as a function of the magnetic field
