We find that the double-threshold voltage-current characteristics in the insulating regime in the ultraclean two-valley two-dimensional electron system in SiGe/Si/SiGe quantum wells are promoted by perpendicular magnetic fields, persisting to an order of magnitude lower voltages and considerably higher electron densities compared to the zero-field case. This observation indicates the perpendicular-magnetic-field stabilization of the quantum electron solid.

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• Electrical properties
• Transport phenomena
• Quantum wells
• Two-dimensional electron gas
• Magnetic techniques