Suppression of the Kondo Effect in a Quantum Dot by Microwave Radiation

Journal of Low Temperature Physics

Volumn 118, Issue 5-6, 2000, Pages 375-389

  Elzerman, Jeroen M ^a   De Franceschi, Silvano ^a   Goldhaber Gordon, David ^a,b   Van Der Wiel, Wilfred G ^a   Kouwenhoven, Leo P ^a  

^a DELFT UNIVERSITY OF TECHNOLOGY   (Netherlands)

^b HARVARD UNIVERSITY   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 0000260978     PISSN: 00222291     EISSN: None     Source Type: Journal    
DOI: 10.1023/a:1004694017738     Document Type: Article

References (25)

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21. g. The shift is related to our "gate-voltage dividers", consisting of two resistors attached to each gate (10 MΩ to ground and 40 MΩ to the gate voltage source), thermally anchored to the mixing chamber of the dilution refrigerator. They provide a low-temperature division of the gate voltage. Due to a T-dependence of the resistors between roughly 100 mK and 600 mK, the division factor is not always exactly equal to 5 but varies up to 10%. Recently we have checked that without the gate voltage dividers, no T-dependent shift occurs.
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23. sd = 0; i.e. the dot acts as an electron pump. Both the value and the polarity of the pumping current depend very sensitively on f. We attribute this to standing waves in the sample holder. We use frequencies that do not produce a pumping current. In this case, the microwave field does not induce an oscillating source-drain bias voltage.
24. 21 was not present in this case. Intense microwaves can heat the electron system, but they do not heat the mixing chamber directly, so they do not affect the gate-voltage dividers.
25. R. López, R. Aguado, and G. Platero, private communication.