Abstract
A helium dilution refrigerator has been modified to enable cyclotron resonance measurements to 100 mK on low-density, 2D electron systems in the ultra-quantum limit. Previous cyclotron resonance work to 300 mK indicates the presence of a phase boundary at a filling factor of v c≈ 1 10 , separating gas-like behavior at v< v c and a new mixed-spin liquid at v≥ v c. The present experiment probes the ground state of these phases, as the temperature is lowered to the Wigner solid regime. We find that, even at 100 mK, the system is spin polarized only at low values of v.
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