Low-temperature behavior of transmission phase shift across a Kondo correlated quantum dot
Low-temperature behavior of transmission phase shift across a Kondo correlated quantum dot
We study the transmission phase shift across a Kondo correlated quantum dot in a GaAs heterostructure at temperatures below the Kondo temperature $(T<{T}_{\mathrm{K}})$, where the phase shift is expected to show a plateau at $\ensuremath{\pi}/2$ for an ideal Kondo singlet ground state. Our device is tuned such that the ratio …