DNAの近接誘発超伝導性は,DNAの近接誘発超伝導性である

A Y Kasumov¹, M Kociak, S Guéron

¹Laboratoire de Physique des Solides, Associé au CNRS, Bât 510, Université Paris-Sud, 91405, Orsay, France.

Science (New York, N.Y.)

|February 24, 2001

まとめ

二重鎖DNAはオーム伝導率を1ケルビンまで示しています. DNA分子は,ミリケルビン温度でも,数百ナノメートル以上の相相相合性を維持し,分子ワイヤーとしての可能性を示唆しています.

科学分野:

分子電子は分子電子である.
凝縮物質物理学凝縮物質物理学
ナノテクノロジーナノテクノロジー

背景:

DNAの電気的性質を理解することは,分子電子工学にとって極めて重要です.
以前の研究では,さまざまな結果でDNA伝導性を調査しました.
凍結温度でのDNAの振る舞いを調査することは,量子装置での応用に不可欠です.

研究の目的:

低温で二重鎖DNA分子の伝導性を測定する.
広い温度範囲でDNAのオームの行動と抵抗を決定する.
DNAの近接誘発超伝導性を調査する.

主な方法:

DNA分子は,コンビングプロセスを用いて,サブミクロンのスリートに収納されました.
導電性測定は,レニウム/炭素の金属コンタクトの間で行われました.
測定は室温から1ケルビンまで行われました.

主要な成果:

DNA伝導は,室温から1ケルビンまでの間,オム単位であることが判明しました.
DNA分子の抵抗は100キログラム未満で,温度の依存性は弱かった.
接近誘発超伝導性は,コンタクトの超伝導的移行温度以下で観察されました.

結論:

DNA分子は,ミリケルビン温度まで電気を伝導することができます.
DNA分子では数百ナノメートルの間に相相相合性が維持される.
これらの発見は,冷凍電子機器のコンポーネントとしてのDNAの可能性を支持しています.

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