Approaching mK temperatures

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Presentation transcript:

Approaching mK temperatures in nanoscale devices https://baselcryogenics.unibas.ch baselcryogenics-physik@unibas.ch

History and Company profile https://baselcryogenics.unibas.ch baselcryogenics-physik@unibas.ch History and Company profile History Publication: APL 104, 211106 (2014) NCCR QSIT qstarter award (2014) BaselCryogenics Startup: homepage https://baselcryogenics.unibas.ch (2015/2016) >100 Filters produced (mostly in-house use) Product development: Low-T world record (2017) People

https://baselcryogenics.unibas.ch baselcryogenics-physik@unibas.ch Low temperatures: Why? Temperature leads to blurring (temperature broadening, e.g. FD distribution) Destroys fragile effects with small energy scale (novel phases) Quasiparticle poisoning, decoherence (quantum computing) => Lower temperature  Microscope with better resolution

Low temperatures: How? 4K 1K 100mK MC https://baselcryogenics.unibas.ch baselcryogenics-physik@unibas.ch Low temperatures: How? 4 step process: Proper shielding Material choice (low heat release / metal) Filter leads (MW) Thermalize leads 4K 1K Our Filters: Ultrastrong attenuation Tight up to 50GHz Small: 6mm*22mm 100mK MC Ideal thermalizer: Long wire + conductive matrix easy to cool/thermalize

Results: Metallic coulomb blockade thermometer https://baselcryogenics.unibas.ch baselcryogenics-physik@unibas.ch Results: Metallic coulomb blockade thermometer High resistance >100kW, cooling through leads not effective Large Cu – islands => on chip nuclear demagnetization Sample shield (Cu-box) 12cm Massive filter: 12cm, 0.3mm diam. Cu wire, Cu core On Cu nucl.stage => on – off chip cooling: APL 111, 253105 (2017) 2.8 mK  World record

(Google: Basel Cryogenics) https://baselcryogenics.unibas.ch baselcryogenics-physik@unibas.ch Thank you for your attention Cold electrons Visit our webpage: https://baselcryogenics.unibas.ch Price: 1 Filter: 600 Eur ≥ 5 Filters: 510 Eur /pp ≥ 10 Filters: 400 Eur /pp Contact us: baselcryogenics-physik@unibas.ch (Google: Basel Cryogenics)