Microwave-induced nonlocal transport in a two-dimensional electron system

We observe microwave-induced nonlocal resistance in magnetotransport in single and bilayer electronic systems. The obtained results provide evidence for an edge-state current stabilized by microwave irradiation due to nonlinear resonances. Our observation is closely related to microwave-induced oscillations and zero resistance states in a two-dimensional electron system.

Figure 1

Longitudinal $R_{xx}$ ($I=1,4$; $V=2,3$) resistance without (no MW) and with microwave irradiation (144,6 GHz) in (a) a narrow (14 nm) and (b) a wide (45 nm) quantum well. Arrows indicate the regions of vanishing resistance.

Figure 2

(a) Nonlocal resistance $R_{26,35}$ ($I=2,6$; $V=3,5$) without (no MW) and under microwave irradiation (138.26 GHz) in a narrow (14 nm) quantum well. (b) Nonlocal resistance $R_{26,35}$ ($I=2,6$; $V=3,5$) under microwave irradiation (144,6 GHz) in wide (45 nm) quantum well with decreasing microwave power. Insets show the measurement configuration.

Figure 3

Nonlocal $R_{26,35}$ ($I=2,6$; $V=3,5$) resistances for narrow (a) and wide (b) quantum wells and for different microwave frequencies. Insets show the measurement configuration.

Figure 4

(a) Examples of electron trajectories along the sample edge for several values of $j=5/4$, $3.15/4$, and $2.8/4$; (b) Poincar$\acute{\text{e}}$ section for $j=2.8/4$, (c) $j=3.15/4$, and (d) $j=5/4$ at $y$-polarized field with $\varepsilon =0.02$.