Quantum dot source-drain transport response at microwave frequencies

Havir, Harald; Haldar, Subhomoy; Khan, Waqar; Lehmann, Sebastian; Dick, Kimberly A.; Thelander, Claes; Samuelsson, Peter; Maisi, Ville F.

doi:10.1103/physrevb.108.205417

Phys. Rev. B

2023

DOI: 10.1103/physrevb.108.205417

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Quantum dot source-drain transport response at microwave frequencies

Harald Havir,

Subhomoy Haldar,

Waqar Khan

et al.

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Cited by 4 publications

References 52 publications

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High impedance Josephson junction resonators in the transmission line geometry

Ranni,

Havir,

Haldar

et al. 2023

Applied Physics Letters

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In this article, we present an experimental study of microwave resonators made out of Josephson junctions. The junctions are embedded in a transmission line geometry so that they increase the inductance per length for the line. By comparing two devices with different input/output coupling strengths, we show that the coupling capacitors, however, add a significant amount to the total capacitance of the resonator. This makes the resonators with high coupling capacitance to act rather as lumped element resonators with inductance from the junctions and capacitance from the end sections. Based on a circuit analysis, we show that the input and output couplings of the resonator are limited to a maximum value of ωrZ0/4Zr, where ωr is the resonance frequency and Z0 and Zr are the characteristic impedances of the input/output lines and the resonator, respectively.

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High impedance Josephson junction resonators in the transmission line geometry

Ranni,

Havir,

Haldar

et al. 2023

Applied Physics Letters

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Single vertical InP nanowire diodes with low ideality factors contacted in-array for high-resolution optoelectronics

Lamers,

Adham,

Hrachowina

et al. 2024

Nanotechnology

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Nanowire (NW) optoelectronic and electrical devices offer unique advantages over bulk materials but are generally made by contacting entire NW arrays in parallel. In contrast, ultra-high-resolution displays and photodetectors require electrical connections to individual NWs inside an array. Here, we demonstrate a scheme for fabricating such single NW vertical devices by contacting individual NWs within a dense NW array. We contrast benzocyclobutene and SiO2 planarization methods for these devices and find that the latter leads to dramatically improved processing yield as well as higher-quality diodes. Further, we find that replacing the metal top contact with transparent indium tin oxide does not decrease electrical performance, allowing for transparent top contacts. We improve the ideality factor of the devices from a previous n = 14 to n = 1.8, with the best devices as low as n = 1.5. The devices are characterized as both photodetectors with detectivities up to 2.45 AW-1 and photocurrent densities of up to 185 mAcm-2 under 0.76 suns illumination. Despite poor performance as light emitting diodes, the devices show great resilience to current densities up to 4×108 mAcm-2. In combination with growth optimization, the flexibility of the processing allows for use of these devices as ultra-high-resolution photodetectors and displays.

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Continuous Microwave Photon Counting by Semiconductor-Superconductor Hybrids

Haldar,

Barker,

Havir

et al. 2024

Phys. Rev. Lett.

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We present a continuous microwave photon counter based on superconducting cavity-coupled semiconductor quantum dots. The device utilizes photon-assisted tunneling in a double quantum dot with tunneling events being probed by a third dot. Our device detects both single and multiple-photon absorption events independently, thanks to the energy tunability of a two-level double-dot absorber. We show that the photon-assisted tunnel rates serve as the measure of the cavity photon state in line with the P(E) theory—a theoretical framework delineating the mediation of the cavity photon field via a two-level absorber. We further describe the single photon detection using the Jaynes-Cummings input-output theory and show that it agrees with the P(E) theory predictions at a low-power regime. Published by the American Physical Society 2024

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Quantum dot source-drain transport response at microwave frequencies

Cited by 4 publications

References 52 publications

High impedance Josephson junction resonators in the transmission line geometry

High impedance Josephson junction resonators in the transmission line geometry

Single vertical InP nanowire diodes with low ideality factors contacted in-array for high-resolution optoelectronics

Continuous Microwave Photon Counting by Semiconductor-Superconductor Hybrids

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