A Smoluchowski-Feynman ratchet: an asymmetric sawtooth potential switches on/off stochastically. During off-phase, particles diffuse freely. When potential switches back on, asymmetry causes net drift — extracting work from thermal noise without violating thermodynamics.
avg drift: 0.000 | flux: 0 particles/s
dx = −(dV/dx)/γ dt + √(2D)dW | D = k_B T / γ | Feynman-Smoluchowski no free lunch (net flux ≠ second law violation)