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Browsing by Subject "magnetic field"

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A scalable high-performance magnetic shield for very long baseline atom interferometry

Wodey, E.; Tell, D.; Rasel, E.M.; Schlippert, D.; Baur, R.; Kissling, U.; Kölliker, B.; Lorenz, M.; Marrer, M.; Schläpfer, U.; Widmer, M.; Ufrecht, C.; Stuiber, S.; Fierlinger, P. (College Park, MD : American Institute of Physics, 2020)

We report on the design, construction, and characterization of a 10 m-long high-performance magnetic shield for very long baseline atom interferometry. We achieve residual fields below 4 nT and longitudinal inhomogeneities ...
Biodistribution, biocompatibility and targeted accumulation of magnetic nanoporous silica nanoparticles as drug carrier in orthopedics

Janßen, Hilke Catherina; Angrisani, Nina; Kalies, Stefan; Hansmann, Florian; Kietzmann, Manfred; Warwas, Dawid Peter; Behrens, Peter; Reifenrath, Janin (London : BioMed Central Ltd., 2020)

Background: In orthopedics, the treatment of implant-associated infections represents a high challenge. Especially, potent antibacterial effects at implant surfaces can only be achieved by the use of high doses of antibiotics, ...
Comparison between the compressibilities of the zero field and composite-fermion metallic states of the two-dimensional electron system

Dorozhkin, S.I.; Smet, J.H.; von Klitzing, K.; Umansky, V.; Haug, Rolf J.; Ploog, K. (College Park, MD : American Physical Society, 2001)

We have studied the capacitance between a two-dimensional electron system and a gate of field-effect transistors, produced from three different wafers with a single remotely doped GaAs/AlxGa1-xAs heterojunction. In the ...
Direct measurements of the spin and valley splittings in the magnetization of a SiSiGe quantum well in tilted magnetic fields

Wilde, M.A.; Rhode, M.; Heyn, C.; Heitmann, D.; Grundler, D.; Zeitler, U.; Schäffler, F.; Haug, Rolf J. (College Park, MD : American Physical Society, 2005)

We present de Haas-van Alphen (dHvA) measurements on high-mobility two-dimensional electron systems formed in modulation-doped SiSiGe (100) quantum wells and demonstrate directly the manifestation of the valley splitting ...
Flux-quantum-modulated Kondo conductance in a multielectron quantum dot

Fühner, C.; Keyser, U.F.; Haug, Rolf J.; Reuter, D.; Wieck, A.D. (College Park, MD : American Physical Society, 2002)

We investigate a lateral semiconductor quantum dot with a large number of electrons in the limit of strong coupling to the leads. A Kondo effect is observed and can be tuned in a perpendicular magnetic field. This Kondo ...
Impurity effects in quantum dots: Toward quantitative modeling

Räsänen, E.; Könemann, J.; Haug, Rolf J.; Puska, M.J.; Nieminen, R.M. (College Park, MD : American Physical Society, 2004)

We have studied the single-electron transport spectrum of a quantum dot in GaAs/AlGaAs resonant tunneling device. The measured spectrum has irregularities indicating a broken circular symmetry. We model the system with an ...
Increased accumulation of magnetic nanoparticles by magnetizable implant materials for the treatment of implant-associated complications

Angrisani, Nina; Foth, Franziska; Kietzmann, Manfred; Schumacher, Stephan; Angrisani, Gian Luigi; Christel, Anne; Behrens, Peter; Reifenrath, Janin (London : BioMed Central Ltd., 2013)

Background: In orthopaedic surgery, accumulation of agents such as anti-infectives in the bone as target tissue is difficult. The use of magnetic nanoparticles (MNPs) as carriers principally enables their accumulation via ...
Low-frequency magnetic response of gold nanoparticles

Harke, Saba; Habibpourmoghadam, Atefeh; Evlyukhin, Andrey B.; Calà Lesina, Antonio; Chichkov, Boris N. ([London] : Macmillan Publishers Limited, part of Springer Nature, 2023)

Gold nanoparticles (AuNPs) exposed to low frequency magnetic fields have shown promise in enhancing biological processes, such as cellular reprogramming. Despite the experimental evidence, a comprehensive understanding of ...
Magnetic-field-induced singularities in spin-dependent tunneling through InAs quantum dots

Hapke-Wurst, I.; Zeitler, U.; Frahm, Holger; Jansen, A.G.M.; Haug, Rolf J.; Pierz, Klaus (College Park, MD : American Physical Society, 2000)

Current steps attributed to resonant tunneling through individual InAs quantum dots embedded in a GaAs-AlAs-GaAs tunneling device are investigated experimentally in magnetic fields up to 28 T. The steps evolve into strongly ...
Morphology and magnetic properties of ferriferous two-phase sodium borosilicate glasses

Naberezhnov, Alexander; Porechnaya, Nadezda; Nizhankovskii, Viktor; Filimonov, Alexey; Nacke, Bernard (New York, NY : Hindawi Publishing Corporation, 2014)

This contribution is devoted to the study of morphology and magnetic properties of sodium borosilicate glasses with different concentrations (15, 20, and 25 wt.%) of α Fe2O3 in an initial furnace charge. These glasses were ...
Neues Konzept zur Entwicklung einer thermischen Freisetzungsstrategie von locked nucleic acids zur Gentherapie

Hempel, Katharina (Hannover : Institutionelles Repositorium der Leibniz Universität Hannover, 2024)

...
Noninvasive detection of charge rearrangement in a quantum dot in high magnetic fields

Fricke, Christian; Rogge, M.C.; Harke, B.; Reinwald, M.; Wegscheider, W.; Hohls, Frank; Haug, Rolf J. (College Park, MD : American Physical Society, 2005)

We demonstrate electron redistribution caused by magnetic field on a single quantum dot measured by means of a quantum point contact as noninvasive detector. Our device, which is fabricated by local anodic oxidation, allows ...
Observation of sequential spin flips in quantum rings

Räsänen, E.; Mühle, A.; Aichinger, M.; Haug, Rolf J. (College Park, MD : American Physical Society, 2011)

We observe strong signatures of spin flips in quantum rings exposed to external magnetic fields in the Coulomb blockade regime. The signatures appear as a pattern of lines corresponding to local reduction of conductance, ...
Shot noise in resonant tunneling through a zero-dimensional state with a complex energy spectrum

Nauen, A.; Hohls, Frank; Könemann, J.; Haug, Rolf J. (College Park, MD : American Physical Society, 2004)

We investigate the noise properties of a GaAs/AlxGa 1-xAs resonant-tunneling structure at bias voltages where the current characteristic is determined by single electron tunneling. We discuss the suppression of the shot ...
Superlattice structures in twisted bilayers of folded graphene

Schmidt, Hennrik; Rode, Johannes C.; Smirnov, Dmitri; Haug, Rolf J. (London : Nature Publishing Group, 2014)

The electronic properties of bilayer graphene strongly depend on relative orientation of the two atomic lattices. Whereas Bernal-stacked graphene is most commonly studied, a rotational mismatch between layers opens up a ...
Swarm accelerometer data processing from raw accelerations to thermospheric neutral densities 2. Aeronomy Swarm Science Results after two years in Space

Siemes, Christian; de Teixeira da Encarnação, Joao; Doornbos, Eelco; van den Ijssel, Jose; Kraus, Jiří; Pereštý, Radek; Grunwaldt, Ludwig; Apelbaum, Guy; Flury, Jakob; Holmdahl Olsen, Poul Erik (Berlin : Springer Berlin, 2016)

The Swarm satellites were launched on November 22, 2013, and carry accelerometers and GPS receivers as part of their scientific payload. The GPS receivers do not only provide the position and time for the magnetic field ...
Tensor-network approach for quantum metrology in many-body quantum systems

Chabuda, Krzysztof; Dziarmaga, Jacek; Osborne, Tobias J.; Demkowicz-Dobrzański, Rafał (London : Nature Publishing Group, 2020)

Identification of the optimal quantum metrological protocols in realistic many particle quantum models is in general a challenge that cannot be efficiently addressed by the state-of-the-art numerical and analytical methods. ...
Tunable nonlocal coupling between Kondo impurities

Tutuc, D.; Popescu, B.; Schuh, D.; Wegscheider, W.; Haug, Rolf J. (College Park, MD : American Physical Society, 2011)

We study the tuning mechanisms of Ruderman-Kittel-Kasuya-Yosida (RKKY) exchange interaction between two lateral quantum dots in the Kondo regime. At zero magnetic field we observe the expected splitting of the Kondo resonance ...

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