title: Self-aligned charge read-out for InAs nanowire quantum dots.
abstract: A highly sensitive charge detector is realized for a quantum dot in an InAs nanowire. We have developed a self-aligned etching process to fabricate in a single step a quantum point contact in a two-dimensional electron gas and a quantum dot in an InAs nanowire. The quantum dot is strongly coupled to the underlying point contact that is used as a charge detector. The addition of one electron to the quantum dot leads to a change of the conductance of the charge detector by typically 20%. The charge sensitivity of the detector is used to measure Coulomb diamonds as well as charging events outside the dot. Charge stability diagrams measured by transport through the quantum dot and charge detection merge perfectly.
authors.affiliation: Solid State Physics Laboratory, ETH Zurich, 8093 Zurich, Switzerland. ivan.shorubalko@gmail.com
authors.forename: Ivan
authors.initials: I
authors.lastname: Shorubalko
authors.forename: Renaud
authors.initials: R
authors.lastname: Leturcq
authors.forename: Andreas
authors.initials: A
authors.lastname: Pfund
authors.forename: David
authors.initials: D
authors.lastname: Tyndall
authors.forename: Roland
authors.initials: R
authors.lastname: Krischek
authors.forename: Silke
authors.initials: S
authors.lastname: Schön
authors.forename: Klaus
authors.initials: K
authors.lastname: Ensslin
mesh_terms: D001152:Arsenicals / Q000737:chemistry*; D004559:Electric Wiring; D004563:Electrochemistry / Q000295:instrumentation* / Q000379:methods; D004867:Equipment Design; D019544:Equipment Failure Analysis; D007204:Indium / Q000737:chemistry*; D008029:Lighting / Q000295:instrumentation* / Q000379:methods; D008968:Molecular Conformation; D036103:Nanotechnology / Q000295:instrumentation* / Q000379:methods; D043942:Nanotubes / Q000737:chemistry* / Q000648:ultrastructure; D045663:Quantum Dots; D055672:Static Electricity
chemical_list: D001152:Arsenicals; D007204:Indium; C076773:indium arsenide