Electron-spin and electron-orbital dependence of the tunnel coupling in laterally coupled double vertical dots.
We employ a new laterally coupled, vertical double dot with a tunable tunnel-coupling gate in a parallel configuration to study the electron spin and orbital dependence of quantum mechanical tunnel coupling on the size of the honeycomb vertices in the small electron numbers regime. We find a transition from the weak coupling regime, where fluctuations in tunnel coupling due to varying electron configuration dominate the anticrossings, to a regime where the two dots coalesce. We apply a magnetic field to ascertain the orbital angular momenta of the Fermi surface eigenstates, which correlate with anticrossing size, and we identify spin pairs with congruent behavior.
Tarucha Mesoscopic Correlation Project, ERATO, JST, Atsugi-shi, Kanagawa 243-0198, Japan. hatano@tarucha.jst.go.jp
T
T
Hatano
M
M
Stopa
T
T
Yamaguchi
T
T
Ota
K
K
Yamada
S
S
Tarucha