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<p>Electronic flicker noise limits phase stability in communication systems, reduces the sensitivity and selectivity of sensors, and degrades coherence in quantum devices. There is a strong need for unconventional materials and strategies for achieving ultra-low-noise performance in nanoscale and quantum electronics. Here, we demonstrate that in nanowires of the quasi-one-dimensional, fully gapped charge-density-wave material (TaSe<sub>4</sub>)<sub>2</sub>I, low-frequency electronic noise is suppressed below the limit of thermalized charge carriers in passive resistors. When the current is dominated by the sliding Frohlich condensate, the normalized noise spectral density, <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\({S}_{I}/{I}^{2}\)</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mrow> <mi>S</mi> </mrow> <mrow> <mi>I</mi> </mrow> </msub> <mo>/</mo> <msup> <mrow> <mi>I</mi> </mrow> <mrow> <mn>2</mn> </mrow> </msup> </math></EquationSource> </InlineEquation>, decreases linearly with current, <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(I\)</EquationSource> <EquationSource Format="MATHML"><math> <mi>I</mi> </math></EquationSource> </InlineEquation> — a striking departure from the constant value of <InlineEquation ID="IEq3"> <EquationSource Format="TEX">\({S}_{I}/{I}^{2}\)</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mrow> <mi>S</mi> </mrow> <mrow> <mi>I</mi> </mrow> </msub> <mo>/</mo> <msup> <mrow> <mi>I</mi> </mrow> <mrow> <mn>2</mn> </mrow> </msup> </math></EquationSource> </InlineEquation>, observed in conventional conductors. No residual minimum noise level is reached for the current of the electron-lattice condensate in (TaSe<sub>4</sub>)<sub>2</sub>I nanowires. Repeating the measurements for another charge-density wave conductor, NbS<sub>3</sub>-II, we found a similar reduction below the normal electron limit at room temperature. Our findings signal intrinsically lower current fluctuations within a correlated electron transport regime.</p>

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A quieter state of charge and ultra-low-noise of the collective current in quasi-1D charge-density-wave nanowires

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年12月31日

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  • Subhajit Ghosh,
  • Nicholas Sesing,
  • Zahra Ebrahim Nataj,
  • Tina Salguero,
  • Sergey Rumyantsev,
  • Roger K. Lake,
  • Alexander A. Balandin

摘要

Electronic flicker noise limits phase stability in communication systems, reduces the sensitivity and selectivity of sensors, and degrades coherence in quantum devices. There is a strong need for unconventional materials and strategies for achieving ultra-low-noise performance in nanoscale and quantum electronics. Here, we demonstrate that in nanowires of the quasi-one-dimensional, fully gapped charge-density-wave material (TaSe4)2I, low-frequency electronic noise is suppressed below the limit of thermalized charge carriers in passive resistors. When the current is dominated by the sliding Frohlich condensate, the normalized noise spectral density, \({S}_{I}/{I}^{2}\) S I / I 2 , decreases linearly with current, \(I\) I — a striking departure from the constant value of \({S}_{I}/{I}^{2}\) S I / I 2 , observed in conventional conductors. No residual minimum noise level is reached for the current of the electron-lattice condensate in (TaSe4)2I nanowires. Repeating the measurements for another charge-density wave conductor, NbS3-II, we found a similar reduction below the normal electron limit at room temperature. Our findings signal intrinsically lower current fluctuations within a correlated electron transport regime.