Browsing by Author "Ono, K."

Now showing 1 - 3 of 3

Spin blockade with spin singlet electrons
(2012-12-24)
Sun, Y. C.
;
Amaha, S.
;
Huang, S. M.
;
Lin, J. J.
;
Kono, K.
We observe a singlet spin blockade (SSB) in two-electron vertical double quantum dots where the single-electron transport is blocked for spin singlet electrons. In contrast to the conventional Pauli spin blockade with spin triplet electrons, this singlet spin blockade is observed under high magnetic field, where the doubly occupied states in one of the dots go beyond the singlet-triplet ground-state transition. The SSB region in Coulomb diamond measurements is in agreement with the two-electron excitation spectrum. A leakage current of 10 pA order is observed in SSB, consistent with the spin singlet lifetime due to random nuclear spin fluctuations. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4773304]
Spin Bottleneck in Resonance Tunneling through In0.04Ga0.96As/GaAs Vertical Double Quantum Dots
(2011-01-01)
Huang, S. M.
;
Tokura, Y.
;
Akimoto, H.
;
Kono, K.
;
Lin, J. J.
We study the electron resonance tunneling through double quantum dots with different g factors. We found that the resonance tunneling current is suppressed even if one of the Zeeman sublevels is aligned. The level broadening effect partially releases the blockade. The current maximum peak appears when the interdot detune is half of Zeeman energy difference of two quantum dots.
Spin Bottleneck in Resonant Tunneling through Double Quantum Dots with Different Zeeman Splittings
(2010-04-02)
Huang, S. M.
;
Tokura, Y.
;
Akimoto, H.
;
Kono, K.
;
Lin, J. J.
We investigated the electron transport property of the InGaAs/GaAs double quantum dots, the electron g factors of which are different from each other. We found that in a magnetic field, the resonant tunneling is suppressed even if one of the Zeeman sublevels is aligned. This is because the other misaligned Zeeman sublevels limit the total current. A finite broadening of the misaligned sublevel partially relieves this bottleneck effect, and the maximum current is reached when interdot detuning is half the Zeeman energy difference.