Quantum-dot charge sensors
Confined electronic levels are sensitive to neighboring charge configurations.
$$I=I(V_g,\epsilon)$$
Physical intuition
Confined electronic levels are sensitive to neighboring charge configurations.
Deep dive: physical mechanism
A nearby charge modifies the dot electrochemical potential, changing current through a quantum point contact or sensor dot.
What is measured experimentally?
Charge transitions appear as steps or dispersive phase shifts.
Assumptions, noise and limitations
Back-action and low-frequency charge noise limit readout.
Research and simulation exercise
Simulate a thermally broadened charge-transition curve.
Connect the ideas
Explore the chapter overview, learning path, and references.