Experimental Progress towards Probing the Ground State of an Electron-Hole Bilayer by Low-Temperature Transport

Figure 19

Resistivities of hole and electron layers versus temperature for 𝑛=𝑝=9×10¹⁰ cm⁻², down to ≈50 mK in a dilution refrigerator. At 𝑇=1.5 K, 𝜇_𝑒=1.5×10⁶ cm²V⁻¹s⁻¹ and 𝜇_ℎ=1.1×10⁵ cm²V⁻¹s⁻¹). (Inset) Change in conductivity relative to 𝜎_𝑥𝑥 (𝑇=2 K). (Device: B138/C4-1-10 nm Barrier).