Abstract
We use Pauli-spin blockade in two-electron vertical double quantum dots to quantitatively estimate the exchange energy in a wide range of interdot level detuning and fully compare it with calculations. Pauli-spin blockade is lifted via a singlet- (-)triplet () transition mediated by hyperfine coupling, which abruptly occurs in our devices when the transition energy or is compensated by the Zeeman energy. We use this feature to derive depending on between the and resonances. The obtained versus including the resonance effect is perfectly reproduced by Hubbard model calculations.
- Received 26 January 2009
DOI:https://doi.org/10.1103/PhysRevLett.102.146802
©2009 American Physical Society