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• W3202089619 abstract "Abstract We have studied 1/ f noise in critical current $$I_c$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:msub> <mml:mi>I</mml:mi> <mml:mi>c</mml:mi> </mml:msub> </mml:math> in h-BN encapsulated monolayer graphene contacted by NbTiN electrodes. The sample is close to diffusive limit and the switching supercurrent with hysteresis at Dirac point amounts to $$simeq 5$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:mo>≃</mml:mo> <mml:mn>5</mml:mn> </mml:mrow> </mml:math> nA. The low frequency noise in the superconducting state is measured by tracking the variation in magnitude and phase of a reflection carrier signal $$v_{rf}$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:msub> <mml:mi>v</mml:mi> <mml:mrow> <mml:mi>rf</mml:mi> </mml:mrow> </mml:msub> </mml:math> at 600–650 MHz. We find 1/ f critical current fluctuations on the order of $$delta I_c/I_c simeq 10^{-3}$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:mi>δ</mml:mi> <mml:msub> <mml:mi>I</mml:mi> <mml:mi>c</mml:mi> </mml:msub> <mml:mo>/</mml:mo> <mml:msub> <mml:mi>I</mml:mi> <mml:mi>c</mml:mi> </mml:msub> <mml:mo>≃</mml:mo> <mml:msup> <mml:mn>10</mml:mn> <mml:mrow> <mml:mo>-</mml:mo> <mml:mn>3</mml:mn> </mml:mrow> </mml:msup> </mml:mrow> </mml:math> per unit band at 1 Hz. The noise power spectrum of critical current fluctuations $$S_{I_c}$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:msub> <mml:mi>S</mml:mi> <mml:msub> <mml:mi>I</mml:mi> <mml:mi>c</mml:mi> </mml:msub> </mml:msub> </mml:math> measured near the Dirac point at large, sub-critical rf-carrier amplitudes obeys the law $$S_{I_c}/{I{_c}}^2 = a/f^{beta }$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:msub> <mml:mi>S</mml:mi> <mml:msub> <mml:mi>I</mml:mi> <mml:mi>c</mml:mi> </mml:msub> </mml:msub> <mml:mo>/</mml:mo> <mml:msup> <mml:mrow> <mml:mi>I</mml:mi> <mml:msub> <mml:mrow /> <mml:mi>c</mml:mi> </mml:msub> </mml:mrow> <mml:mn>2</mml:mn> </mml:msup> <mml:mo>=</mml:mo> <mml:mi>a</mml:mi> <mml:mo>/</mml:mo> <mml:msup> <mml:mi>f</mml:mi> <mml:mi>β</mml:mi> </mml:msup> </mml:mrow> </mml:math> where $$asimeq 4times 10^{-6}$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:mi>a</mml:mi> <mml:mo>≃</mml:mo> <mml:mn>4</mml:mn> <mml:mo>×</mml:mo> <mml:msup> <mml:mn>10</mml:mn> <mml:mrow> <mml:mo>-</mml:mo> <mml:mn>6</mml:mn> </mml:mrow> </mml:msup> </mml:mrow> </mml:math> and $$beta simeq 1$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:mi>β</mml:mi> <mml:mo>≃</mml:mo> <mml:mn>1</mml:mn> </mml:mrow> </mml:math> at $$f > 0.1$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:mi>f</mml:mi> <mml:mo>></mml:mo> <mml:mn>0.1</mml:mn> </mml:mrow> </mml:math> Hz. Our results point towards significant fluctuations in $$I_c$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:msub> <mml:mi>I</mml:mi> <mml:mi>c</mml:mi> </mml:msub> </mml:math> originating from variation of the proximity induced gap in the graphene junction." @default.
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• W3202089619 date "2021-10-06" @default.
• W3202089619 modified "2023-10-15" @default.
• W3202089619 title "Critical current fluctuations in graphene Josephson junctions" @default.
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• W3202089619 doi "https://doi.org/10.1038/s41598-021-99398-3" @default.
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