Signatures of the discrete level spectrum in temperature-dependent transport through open quantum-dot arrays

Nonlocal resonant interaction between coupled quantum wires

“…,14 The dashed line was This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions.…”

Interaction corrections to transport due to quasibound states in open quantum dots

“…where T is the temperature, and R 0 , R 1 , R 2 , T 0 , and p are fit parameters. 8 In our experimental investigations of these variations, we have suggested that the exponential term in Eq. ͑1͒ arises from the resolution of the discrete dot levels with decreasing temperature, 8 while the ln T term is thought to be a signature of many-body interactions, since it is not reproduced in single-particle treatments.…”

“…Indeed, in a series of recent experimental reports, we have discussed the presence of features in the electrical properties of open dots which are believed to be associated with such many-body interactions. [6][7][8] In this letter, we formulate a many-body model of transport in open quantum dots, which is based upon the idea of an enhanced electron-electron interaction in the vicinity of a quasibound state. Our studies suggest that the effect of including this peaked interaction is to increase the amplitude of the conductance fluctuations, beyond the value expected from a single-particle treatment.…”

“…We also consider the relevance of our model to the earlier-mentioned experimental studies of open quantum dots, which have demonstrated unexpected results at low temperatures, where interaction effects are thought to be pronounced. [6][7][8] The key experimental observations to this study are summarized in Fig. 1, which shows the temperature dependence of the resistance of a split-gate quantum-dot array, for two different gate-bias conditions.…”

“…3,4,6 -8 The data shown in Fig. 1 are quite representative 7,8 and were obtained by setting the gate voltage to correspond to a local maximum ͑upper curve͒ and minimum in the lowtemperature resistance versus gate voltage curve. [6][7][8] The dotted line through each data set represents a fit of the resistance to the following form:…”