title: Design of a scanning gate microscope for mesoscopic electron systems in a cryogen-free dilution refrigerator.
abstract: We report on our design of a scanning gate microscope housed in a cryogen-free dilution refrigerator with a base temperature of 15 mK. The recent increase in efficiency of pulse tube cryocoolers has made cryogen-free systems popular in recent years. However, this new style of cryostat presents challenges for performing scanning probe measurements, mainly as a result of the vibrations introduced by the cryocooler. We demonstrate scanning with root-mean-square vibrations of 0.8 nm at 3 K and 2.1 nm at 15 mK in a 1 kHz bandwidth with our design. Using Coulomb blockade thermometry on a GaAs/AlGaAs gate-defined quantum dot, we demonstrate an electron temperature of 45 mK.
authors.affiliation: Department of Applied Physics, Stanford University, 348 Via Pueblo Mall, Stanford, California 94305, USA.
authors.forename: M
authors.initials: M
authors.lastname: Pelliccione
authors.forename: A
authors.initials: A
authors.lastname: Sciambi
authors.forename: J
authors.initials: J
authors.lastname: Bartel
authors.forename: A J
authors.initials: AJ
authors.lastname: Keller
authors.forename: D
authors.initials: D
authors.lastname: Goldhaber-Gordon
mesh_terms: D015925:Cryopreservation; D004583:Electrons; D004867:Equipment Design; D005615:Freezing; D008280:Magnetics; D018625:Microscopy, Atomic Force / Q000295:instrumentation / Q000379:methods; D008855:Microscopy, Electron, Scanning / Q000295:instrumentation* / Q000379:methods; D016252:Microscopy, Scanning Tunneling / Q000295:instrumentation* / Q000379:methods; D009991:Oscillometry / Q000379:methods; D013696:Temperature