Figure 4
From: Synchronized charge oscillations in correlated electron systems
Analyzing the coupling dynamics of VO2 oscillators.
(a) Equivalent circuit model for capacitively coupled VO2 oscillators. C1 and C2 are the effective capacitances of each oscillator, which include the internal VO2 capacitance associated with VO2 film and the device (CVO2) as well as parasitic capacitances. Rp → ∞. The same circuit is used to simulate the experimentally observed frequency locking and has been verified with experimental data as shown earlier. (b) Voltage flow diagram in phase space for steady state coupled oscillations. 1–2–3–4 is the electrical trajectory of the capacitively coupled configuration. It reveals that the coupled oscillators primarily move in the M-I and I-M phase planes. (c) The electrical trajectory of the coupled oscillator configuration in phase space. (d) Simulated time domain waveform of the two VO2 oscillators after coupling (top). The to and fro movement of charge (Qc) across the capacitor enables the two oscillators to synchronize (bottom).
