18 citations · 102 across the 10 of their papers we have counts for
10 papers
Towards Utilizing Scanning Gate Microscopy as a High-Resolution Probe of Valley Splitting in Si/SiGe Heterostructures
Efe Cakar, H. Ekmel Ercan, Gordian Fuchs +4
A detailed understanding of the material properties that affect the splitting between the two low-lying valley states in Si/SiGe heterostructures will be increasingly important as…
Dispersive readout of a silicon quantum device using an atomic force microscope-based rf gate sensor
Artem O. Denisov, Gordian Fuchs, Seong W. Oh +1
We demonstrate dispersive charge sensing of Si/SiGe single and double quantum dots (DQD) by coupling sub-micron floating gates to a radio frequency reflectometry (rf-reflectometry)…
Second Quantization: Gating a Quantum Dot Through the Sequential Removal of Single Electrons from a Nanoscale Floating Gate
Artem O. Denisov, Gordian Fuchs, Seong W. Oh +1
We use the tip of an atomic force microscope (AFM) to charge floating metallic gates defined on the surface of a Si/SiGe heterostructure. The AFM tip serves as an ideal and movable…
Microwave-frequency scanning gate microscopy of a Si/SiGe double quantum dot
Artem O. Denisov, Seong W. Oh, Gordian Fuchs +6
Conventional quantum transport methods can provide quantitative information on spin, orbital, and valley states in quantum dots, but often lack spatial resolution. Scanning tunneli…
Cryogen-free scanning gate microscope for the characterization of Si/SiGe quantum devices at milli-Kelvin temperatures
Seong Woo Oh, Artem O. Denisov, Pengcheng Chen +1
Silicon can be isotopically enriched, allowing for the fabrication of highly coherent semiconductor spin qubits. However, the conduction band of bulk Si exhibits a six-fold valley…
Charge-neutral nonlocal response in superconductor-InAs nanowire hybrid devices
A. O. Denisov, A. V. Bubis, S. U. Piatrusha +8
Nonlocal quasiparticle transport in normal-superconductor-normal (NSN) hybrid structures probes sub-gap states in the proximity region and is especially attractive in the context o…
Heat-mode excitation in a proximity superconductor
A. O. Denisov, A. V. Bubis, S. U. Piatrusha +8
Mesoscopic superconductivity deals with various quasiparticle excitation modes, only one of them -- the charge-mode -- being directly accessible for conductance measurements due to…
Spatial and energy resolution of electronic states by shot noise
E. S. Tikhonov, A. O. Denisov, S. U. Piatrusha +5
Shot noise measurements are widely used for the characterization of nonequilibrium configurations in electronic conductors. The recently introduced quantum tomography approach was…
Strategy for accurate thermal biasing at the nanoscale
Artem Denisov, Evgeny Tikhonov, Stanislau Piatrusha +6
We analyze the benefits and shortcomings of a thermal control in nanoscale electronic conductors by means of the contact heating scheme. Ideally, this straightforward approach allo…
Proximity effect and interface transparency in Al/InAs-nanowire/Al diffusive junctions
A. V. Bubis, A. O. Denisov, S. U. Piatrusha +6
We investigate the proximity effect in InAs nanowire (NW) junctions with superconducting contacts made of Al. The carrier density in InAs is tuned by means of the back gate voltage…