TY - JOUR
T1 - Spacing and width of Coulomb blockade peaks in a silicon quantum dot
AU - Abusch-Magder, David
AU - Simmel, F.
AU - Wharam, D. A.
AU - Kastner, M. A.
AU - Kotthaus, J. P.
N1 - Funding Information:
The authors would like to thank the staff of the Microelectronics Lab at Lincoln Laboratory for their help with device fabrication, and U. Sivan, M. Stopa, H. Baranger for fruitful discussions. This work was supported by the Alexander-von-Humboldt Foundation, the DFG Sonderforschungsbereich 348, and by the Army Research Office under contract DAAH04-94-0199 and contract DAAH04-95-0038. Work at Lincoln Laboratory was sponsored by the US Air Force. DA-M gratefully acknowledges support from the Alexander-von-Humboldt Foundation, and the Bell Labs Foundation.
PY - 2000/2
Y1 - 2000/2
N2 - We present an experimental study of the fluctuations of Coulomb blockade peak positions of a quantum dot. The dot is defined by patterning the two-dimensional electron gas of a silicon MOSFET structure using stacked gates. The ratio of charging energy to single-particle energy is considerably larger than in comparable GaAs/AlGaAs quantum dots. The statistical distribution of the conductance peak spacings in the Coulomb blockade regime was found to be unimodal and does not follow the Wigner surmise. The fluctuations of the spacings are much larger than the typical single-particle level spacing and thus clearly contradict the expectation of random matrix theory. Measurements of the natural line width of a set of several adjacent conductance peaks suggest that all of the peaks in the set are dominated by electrons being transported through a single-broad energy level.
AB - We present an experimental study of the fluctuations of Coulomb blockade peak positions of a quantum dot. The dot is defined by patterning the two-dimensional electron gas of a silicon MOSFET structure using stacked gates. The ratio of charging energy to single-particle energy is considerably larger than in comparable GaAs/AlGaAs quantum dots. The statistical distribution of the conductance peak spacings in the Coulomb blockade regime was found to be unimodal and does not follow the Wigner surmise. The fluctuations of the spacings are much larger than the typical single-particle level spacing and thus clearly contradict the expectation of random matrix theory. Measurements of the natural line width of a set of several adjacent conductance peaks suggest that all of the peaks in the set are dominated by electrons being transported through a single-broad energy level.
UR - http://www.scopus.com/inward/record.url?scp=0034138989&partnerID=8YFLogxK
U2 - 10.1016/S1386-9477(99)00186-1
DO - 10.1016/S1386-9477(99)00186-1
M3 - Conference article
AN - SCOPUS:0034138989
SN - 1386-9477
VL - 6
SP - 382
EP - 387
JO - Physica E: Low-Dimensional Systems and Nanostructures
JF - Physica E: Low-Dimensional Systems and Nanostructures
IS - 1
T2 - 13th International Conference on the Electronic Properties of Two-Dimensional Systems (EP2DS-13)
Y2 - 1 August 1999 through 6 August 1999
ER -