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. © 2014 Author(s).
CITATION STYLE
Scheller, C. P., Heizmann, S., Bedner, K., Giss, D., Meschke, M., Zumbühl, D. M., … Gossard, A. C. (2014). Silver-epoxy microwave filters and thermalizers for millikelvin experiments. Applied Physics Letters, 104(21). https://doi.org/10.1063/1.4880099
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