Elsevier

Surface Science

Volume 263, Issues 1–3, 19 February 1992, Pages 415-418
Surface Science

Electron transport through one quantum dot and through a string of quantum dots

https://doi.org/10.1016/0039-6028(92)90379-KGet rights and content

Abstract

We have built strings of quantum dots consisting of 1 up to 4 dots. Transport measurements of these devices show sharp resonant conductance peaks around threshold. Our results are discussed in terms of Coulomb charging and of quantum confinement effects, since both effects are expected to be of the same order of magnitude for these devices.

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    Citation Excerpt :

    In this wave vector regime, the GKT, which limits the reach of other long wavelength optical probes, is no longer valid, and the Raman scattering is found to be effective in giving access to excitations that exhibit the combined effects of the confining potentials and e–e interactions. Experimental techniques used to probe the semiconductor quantum dots, mostly in the presence of an external magnetic field usually oriented perpendicular to the original 2DEG, include, e.g., electrical measurements of the I–V curve [1128,1141,1146,1150,1171,1173,1176,1180,1185,1186], capacitance spectroscopy [1129,1131,1135,1167], FIR spectroscopy [1130,1133,1134,1136,1138,1144,1145,1155,1160,1163,1167,1178,1188], transport measurements [1132,1137,1139,1140,1143,1151,1153,1154,1156,1158,1161,1166,1172,1182,1189], resonant tunneling [1142,1147,1149,1152,1164,1169,1174], single-electron capacitance spectroscopy (SECS) [1148,1159,1162,1187], PL spectroscopy [1157,1175,1177,1179,1184], microwave photoconductivity technique [1165], photon-assisted tunneling (PAT) [1168], single-electron tunneling spectroscopy (SETS) [1170,1183], resonant Raman scattering [1181], and EELS [1190]. Here the SECS is shown to allow the direct measurement of the energies of quantum levels of an individual dot as a function of magnetic field.

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