Fig. 2: Transport detected plasmon resonances.
Microchannel transport measurements in the presence of a ω/2π = 5.5 GHz microwave excitation signal on the gate electrode for increasing values of microwave power P. Traces are offset vertically for clarity and color coded with the corresponding P. Vertical dashed lines indicate the transition into a low-conductivity Wigner crystal electron state, which increases with increasing P. At P ≳ − 15 dBm, resonance-like features appear in regime II, indicating plasmon modes generated along the length of the channel as described in the main text. Measurements were performed at T = 18 mK, with Vgt = 0 V, Vac = 6 mV, fac = 3 MHz, and \({V}_{{{{\rm{res}}}}}\,=\,0.4\) V.
