TY - JOUR
T1 - Electron tunneling through single self-assembled InAs quantum dots coupled to nanogap electrodes
AU - Shibata, K.
AU - Jung, M.
AU - Buizert, C.
AU - Oiwa, A.
AU - Hirakawa, K.
AU - Machida, T.
AU - Tarucha, S.
PY - 2008
Y1 - 2008
N2 - We have investigated electronic properties of self-assembled InAs quantum dots (QDs) grown on GaAs surfaces by using metallic Au and Al leads with narrow gaps. The fabricated junctions with Au nanogap electrodes show single electron tunneling behaviors. When coupling between electrons in the QDs and the electrodes is strong, Kondo effect with relatively high Kondo temperature T K of 10-15 K is observed. The samples with superconducting (SC) Al electrodes also exhibit clear Coulomb blockade effects. Furthermore, clear suppression in conductance is observed around VSD = 0 V for a voltage range of 4Δ/e at T = 40 mK, where Δ is the SC energy gap of Al, demonstrating successful fabrication of the SC-QD-SC junction in the self-assembled InAs QD system.
AB - We have investigated electronic properties of self-assembled InAs quantum dots (QDs) grown on GaAs surfaces by using metallic Au and Al leads with narrow gaps. The fabricated junctions with Au nanogap electrodes show single electron tunneling behaviors. When coupling between electrons in the QDs and the electrodes is strong, Kondo effect with relatively high Kondo temperature T K of 10-15 K is observed. The samples with superconducting (SC) Al electrodes also exhibit clear Coulomb blockade effects. Furthermore, clear suppression in conductance is observed around VSD = 0 V for a voltage range of 4Δ/e at T = 40 mK, where Δ is the SC energy gap of Al, demonstrating successful fabrication of the SC-QD-SC junction in the self-assembled InAs QD system.
UR - http://www.scopus.com/inward/record.url?scp=77951291044&partnerID=8YFLogxK
U2 - 10.1002/pssc.200779200
DO - 10.1002/pssc.200779200
M3 - Conference article
AN - SCOPUS:77951291044
SN - 1862-6351
VL - 5
SP - 2869
EP - 2872
JO - Physica Status Solidi (C) Current Topics in Solid State Physics
JF - Physica Status Solidi (C) Current Topics in Solid State Physics
IS - 9
T2 - 34th International Symposium on Compound Semiconductors, ISCS-2007
Y2 - 15 October 2007 through 18 October 2007
ER -