Mapping the Chemical Potential Landscape of a Triple Quantum Dot
  We investigate the non-equilibrium charge dynamics of a triple quantum dot and demonstrate how electron transport through these systems can give rise to non-trivial tunnelling paths. Using a real-time charge sensing method we establish tunnelling pathways taken by particular electrons under well-defined electrostatic configurations. We show how these measurements map to the chemical potentials for different charge states across the system. We use a modified Hubbard Hamiltonian to describe the system dynamics and show that it reproduces all experimental observations. 
M. A. Broome, S. K. Gorman, J. G. Keizer, T. F. Watson, S. J. Hile, W.   J. Baker, M. Y. Simmons
cond-mat.mes-hall quant-ph