Extended Data Fig. 5: Optical measurement of charge compressibility and charge gap. | Nature Materials

Extended Data Fig. 5: Optical measurement of charge compressibility and charge gap.

From: Competition between excitonic insulators and quantum Hall states in correlated electron–hole bilayers

Extended Data Fig. 5

a, Charge compressibility of the e-h bilayer, defined as the numerical derivative of net charge density ne−nh with respect to gate voltage VG, measured at B = 0. In the EI phase, the charge compressibility is zero despite finite carrier density (Fig. 1c-d). b, Charge compressibility measured at B = 12 T. c, Charge gap size as a function of VB at B = 12 T. The horizontal line marks the cyclotron energy of electrons/holes using an effective mass of 0.5m0.

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