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2006•Physica status solidi. C, Conferences and critical reviews/Physica status solidi. C, Current topics in solid state physicsRequires access

Enhanced shot noise in tunneling through coupled self‐assembled InAs quantum dots

P. Barthold, F. Hohls, Niels Maire, K. Pierz, R. J. Haug

Open publisher page 4 citations

Abstract

Abstract We present measurements of the shot noise of vertically coupled self‐assembled InAs quantum dots (QDs) and find a surprising enhancement with a distinct double‐peak structure. 1By applying an external bias voltage we observe pronounced peaks in the dc current–voltage characteristics that correspond to electron transport through a stack of vertically coupled QDs. At these peaks we find enhanced shot noise in contrast to suppressed shot noise at a single layer of QDs. To characterize the measured shot noise S the so‐called Fano factor α is introduced. At both sides of the current peak the Fano factor α rises to values up to 1.4, whereas the noise is reduced on top of the peak (α < 1). We discuss qualitative agreement with a theoretical model which predict such a super‐Poissonian shot noise. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Abstract We present measurements of the shot noise of vertically coupled self‐assembled InAs quantum dots (QDs) and find a surprising enhancement with a distinct double‐peak structure. 1By applying an external bias voltage we observe pronounced peaks in the dc current–voltage characteristics that correspond to electron transport through a stack of vertically coupled QDs. At these peaks we find enhanced shot noise in contrast to suppressed shot noise at a single layer of QDs. To characterize the measured shot noise S the so‐called Fano factor α is introduced. At both sides of the current peak the Fano factor α rises to values up to 1.4, whereas the noise is reduced on top of the peak (α < 1). We discuss qualitative agreement with a theoretical model which predict such a super‐Poissonian shot noise. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Available abstract

Abstract We present measurements of the shot noise of vertically coupled self‐assembled InAs quantum dots (QDs) and find a surprising enhancement with a distinct double‐peak structure. 1By applying an external bias voltage we observe pronounced peaks in the dc current–voltage characteristics that correspond to electron transport through a stack of vertically coupled QDs. At these peaks we find enhanced shot noise in contrast to suppressed shot noise at a single layer of QDs. To characterize the measured shot noise S the so‐called Fano factor α is introduced. At both sides of the current peak the Fano factor α rises to values up to 1.4, whereas the noise is reduced on top of the peak (α < 1). We discuss qualitative agreement with a theoretical model which predict such a super‐Poissonian shot noise. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

Key concepts: Fano factor, Shot noise, Quantum dot, Noise (video), Biasing, Physics, Quantum tunnelling, Condensed matter physics

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