Silver-epoxy microwave filters and thermalizers for millikelvin experiments

We present silver-epoxy filters combining excellent microwave attenuation with efficient wire thermalization, suitable for low temperature quantum transport experiments. Upon minimizing parasitic capacitances, the attenuation reaches ≥100 dB above ≈150 MHz and—when capacitors are added—already above...

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Veröffentlicht in:Applied physics letters 2014-05, Vol.104 (21)
Hauptverfasser: Scheller, Christian P., Heizmann, Sarah, Bedner, Kristine, Giss, Dominic, Meschke, Matthias, Zumbühl, Dominik M., Zimmerman, Jeramy D., Gossard, Arthur C.
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Sprache:eng
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Zusammenfassung:We present silver-epoxy filters combining excellent microwave attenuation with efficient wire thermalization, suitable for low temperature quantum transport experiments. Upon minimizing parasitic capacitances, the attenuation reaches ≥100 dB above ≈150 MHz and—when capacitors are added—already above ≈30 MHz. We measure the device electron temperature with a GaAs quantum dot and demonstrate excellent filter performance. Upon improving the sample holder and adding a second filtering stage, we obtain electron temperatures as low as 7.5 ± 0.2 mK in metallic Coulomb blockade thermometers.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4880099