Spectroscopy of the local density of states in nanowires using integrated quantum dots

In quantum dot (QD) electron transport experiments additional features can appear in the differential conductance $dI/dV$ that do not originate from discrete states QD, but rather a modulation of density-of-states (DOS) leads. These are particularly pronounced when leads strongly confined low dimensional systems, such as nanowire (NW) where is one-dimensional and quasi-zero lead-states emerge. this paper we study InAs NWs. We use QD integrated directly into NW during epitaxial growth an energetically spatially well-defined tunnel probe to perform spectroscopy bound `left' `right' lead segments. By tuning sidegate close proximity one segment, distinguish related DOS excited QD. implement non-interacting capacitance model derive expressions for slopes resonances two-dimensional plots function source-drain bias gate voltage terms different lever arms determined by capacitive couplings. discuss how interplay between affect slopes. verify our numerically calculating using resonant tunneling with three dots series. Finally, used describe measured spectra extract quantitatively couplings Our results constitute important step towards quantitative understanding normal superconducting subgap hybrid devices.