Výsledky vyhledávání - "Anneli Löfgren"

Surviving conduction symmetries in non-linear response

Autor: Anneli Löfgren, Richard J. K. Taylor, Pär Omling, C. A. Marlow, Heiner Linke, Lars Samuelson, Ivan Shorubalko

Publikováno v: Superlattices and Microstructures. 34:173-177

In linear response, the electric conductance of mesoscopic, two-terminal devices is symmetric with respect to the direction of an external magnetic field. The conductance symmetry, in general, breaks down in the non-linear regime of transport. Here w

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::502beed1799488e9554e05bd70abafa8
https://doi.org/10.1016/j.spmi.2004.03.005

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Quantum ratchets and quantum heat pumps

Autor: Hongqi Xu, Poul Erik Lindelof, R. Newbury, Richard J. K. Taylor, T. E. Humphrey, A. O. Sushkov, Heiner Linke, Anneli Löfgren, Pär Omling

Publikováno v: Applied Physics A. 75:237-246

Quantum ratchets are Brownian motors in which the quantum dynamics of particles induces qualitatively new behavior. We review a series of experiments in which asymmetric semiconductor devices of sub-micron dimensions are used to study quantum ratchet

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::b170fa7d42941f0b8a158c28b4b929d0
https://doi.org/10.1007/s003390201335

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Electron quantum ratchets

Autor: Heiner Linke, Anneli Löfgren, Hongqi Xu, Weidong Sheng, Pär Omling, A. Svensson, Poul Erik Lindelof

Publikováno v: Microelectronic Engineering. 47:265-267

Ratchets are spatially asymmetric devices in which directed particle flow can occur due to the rectification of fluctuations, in the absence of external net forces or gradients. In this paper we point out that mesoscopic semiconductor structures are

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::9255fccff67b4733e4c46a2b07f34024
https://doi.org/10.1016/s0167-9317(99)00210-5

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Triangular ballistic quantum dots: classical, semiclassical and wave mechanical electron dynamics

Autor: Anneli Löfgren, M. Yousefi, Igor Zozoulenko, Heiner Linke, Poul Erik Lindelof, L. Christensson, Karl-Fredrik Berggren, Pär Omling

Publikováno v: ResearcherID

The relation between classical electron orbits and quantum mechanical wavefunctions is discussed in two ways, using the example of triangular ballistic quantum dots. Firstly, the frequency of conductance fluctuations observed in the magnetoresistance

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::86ce0b5ea9c39e77f35c3d11de4f66ac
https://doi.org/10.1088/0268-1242/13/8a/009

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Symmetry of magnetoconductance fluctuations of quantum dots in the nonlinear response regime

Autor: Ivan Shorubalko, Anneli Löfgren, Heiner Linke, Richard J. K. Taylor, C. A. Marlow, Poul Erik Lindelof, R. Newbury, T. E. Humphrey, Pär Omling

Publikováno v: Physical Review B. 73

We investigate the symmetry of magnetoconductance fluctuations of phase-coherent, two-terminal quantum dots in the nonlinear regime of transport. Specifically, we consider open, ballistic quantum dots (electron billiards) with and without symmetry ax

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::4f913d8adbd0851e831ad02b09f236ec
https://doi.org/10.1103/physrevb.73.235321

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Symmetry of Two-Terminal Nonlinear Electric Conduction

Autor: Anneli Löfgren, Lars Samuelson, C. A. Marlow, Richard J. K. Taylor, Ivan Shorubalko, Heiner Linke, Pär Omling

Publikováno v: Scopus-Elsevier

The well-established symmetry relations for linear transport phenomena can not, in general, be applied in the non-linear regime. Here we propose a set of symmetry relations with respect to bias voltage and magnetic field for the non-linear conductanc

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ba6b8e8954ba5ad0d940362bd13fb0f2
https://doi.org/10.1103/physrevlett.92.046803

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Experimental tunneling ratchets

Autor: Richard J. K. Taylor, Anneli Löfgren, T. E. Humphrey, Heiner Linke, A. O. Sushkov, Pär Omling, R. Newbury

Publikováno v: ResearcherID

Adiabatically rocked electron ratchets, defined by quantum confinement in semiconductor heterostructures, were experimentally studied in a regime where tunneling contributed to the particle flow. The rocking-induced electron flow reverses direction a

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6e1ab64689bd7ffd1ee89aa991093445
https://pubmed.ncbi.nlm.nih.gov/10600735

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Epitaxially overgrown, stable W–GaAs Schottky contacts with sizes down to 50 nm

Autor: Anneli Löfgren, Jan-Olle Malm, Anders Gustafsson, Lars Montelius, N Nilsson, Lars Samuelson, Lars-Erik Wernersson, Håkan Pettersson, Werner Seifert, Kristina Georgsson

Publikováno v: Journal of Vacuum Science & Technology B: Microelectronics and Nanometer Structures. 20:580

A processing scheme for the fabrication of embedded W-GaAs contacts has been established and the resulting contact characteristics have been evaluated. The main advantage of these contacts is that they are stable during high-temperature epitaxial ove

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::4c323277b378a48df9093d855e1fe0e6
https://doi.org/10.1116/1.1454128

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