Relevant bibliographies by topics / Magnetotransport experiments

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  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'Magnetotransport experiments'

Author: Grafiati
Published: 4 June 2021
Last updated: 5 February 2022

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Journal articles on the topic "Magnetotransport experiments"

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Hirler, F., J. Smoliner, E. Gornik, G. Weimann, and W. Schlapp. "Energy levels in quantum wires studied by tunneling and magnetotransport experiments." Applied Physics Letters 57, no. 3 (July 16, 1990): 261–63. http://dx.doi.org/10.1063/1.103708.

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Hilke, Michael, Mathieu Massicotte, Eric Whiteway, and Victor Yu. "Weak Localization in Graphene: Theory, Simulations, and Experiments." Scientific World Journal 2014 (2014): 1–8. http://dx.doi.org/10.1155/2014/737296.

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We provide a comprehensive picture of magnetotransport in graphene monolayers in the limit of nonquantizing magnetic fields. We discuss the effects of two-carrier transport, weak localization, weak antilocalization, and strong localization for graphene devices of various mobilities, through theory, experiments, and numerical simulations. In particular, we observe a minimum in the weak localization and strong localization length reminiscent of the minimum in the conductivity, which allows us to make the connection between weak and strong localization. This provides a unified framework for both localizations, which explains the observed experimental features. We compare these results to numerical simulation and find a remarkable agreement between theory, experiment, and numerics. Various graphene devices were used in this study, including graphene on different substrates, such as glass and silicon, as well as low and high mobility devices.
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Gracia-Abad, Rubén, Soraya Sangiao, Chiara Bigi, Sandeep Kumar Chaluvadi, Pasquale Orgiani, and José María De Teresa. "Omnipresence of Weak Antilocalization (WAL) in Bi2Se3 Thin Films: A Review on Its Origin." Nanomaterials 11, no. 5 (April 22, 2021): 1077. http://dx.doi.org/10.3390/nano11051077.

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Topological insulators are materials with time-reversal symmetric states of matter in which an insulating bulk is surrounded by protected Dirac-like edge or surface states. Among topological insulators, Bi2Se3 has attracted special attention due to its simple surface band structure and its relatively large band gap that should enhance the contribution of its surface to transport, which is usually masked by the appearance of defects. In order to avoid this difficulty, several features characteristic of topological insulators in the quantum regime, such as the weak-antilocalization effect, can be explored through magnetotransport experiments carried out on thin films of this material. Here, we review the existing literature on the magnetotransport properties of Bi2Se3 thin films, paying thorough attention to the weak-antilocalization effect, which is omnipresent no matter the film quality. We carefully follow the different situations found in reported experiments, from the most ideal situations, with a strong surface contribution, towards more realistic cases where the bulk contribution dominates. We have compared the transport data found in literature to shed light on the intrinsic properties of Bi2Se3, finding a clear relationship between the mobility and the phase coherence length of the films that could trigger further experiments on transport in topological systems.
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KILLI, MATTHEW, SI WU, and ARUN PARAMEKANTI. "GRAPHENE: KINKS, SUPERLATTICES, LANDAU LEVELS AND MAGNETOTRANSPORT." International Journal of Modern Physics B 26, no. 21 (July 18, 2012): 1242007. http://dx.doi.org/10.1142/s0217979212420076.

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We review recent work on superlattices in monolayer and bilayer graphene. We highlight the role of the quasiparticle chirality in generating new Dirac fermion modes with tunable anisotropic velocities in one dimensional (1D) superlattices in both monolayer and bilayer graphene. We discuss the structure of the Landau levels and magnetotransport in such superlattices over a wide range of perpendicular (orbital) magnetic fields. In monolayer graphene, we show that an orbital magnetic field can reverse the anisotropy of the transport imposed by the superlattice potential, suggesting possible switching-type device applications. We also consider topological modes localized at a kink in an electric field applied perpendicular to bilayer graphene, and show how interactions convert these modes into a two-band Luttinger liquid with tunable Luttinger parameters. The band structures of electric field superlattices in bilayer graphene (with or without a magnetic field) are shown to arise naturally from a coupled array of such topological modes. We briefly review some bandstructure results for 2D superlattices. We conclude with a discussion of recent tunneling and transport experiments and point out open issues.
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GRYGLAS, M., M. BAJ, B. JOUAULT, A. RAYMOND, C. CHAUBET, B. CHENAUD, J. L. ROBERT, and G. FAINI. "2DEG SPECTROSCOPY WITH RESONANT TUNNELING THROUGH SINGLE IMPURITY STATE." International Journal of Nanoscience 02, no. 06 (December 2003): 585–92. http://dx.doi.org/10.1142/s0219581x0300170x.

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We have used silicon impurities in an aluminum arsenide barrier to probe an adjacent two-dimensional electron gas (2DEG). A single impurity acts as a local spectrometer and scans the local density of states of the 2DEG. Magnetotransport experiments have been performed at low temperature with a magnetic field B applied along the direction of the current. Current–voltage characteristics strongly depend on B and reveal the formation of Landau levels (LLs).
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Schmidt, P. E., E. Barbier, M. Rossmanith, and M. Dobers. "Low‐temperature magnetotransport experiments in pseudomorphic GaAs/Ga0.87In0.13As/Al0.40Ga0.60As semiconductor‐insulator‐semiconductor field‐effect transistors." Applied Physics Letters 59, no. 11 (September 9, 1991): 1320–22. http://dx.doi.org/10.1063/1.105487.

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FUJITA, SHIGEJI, NEBI DEMEZ, JEONG-HYUK KIM, and H. C. HO. "MAGNETORESISTANCE IN COPPER." International Journal of Modern Physics B 22, no. 25n26 (October 20, 2008): 4434–41. http://dx.doi.org/10.1142/s0217979208050188.

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The motion of the guiding center of magnetic circulation generates a charge transport. By applying kinetic theory to the guiding center motion, an expression for the magnetoconductivity σ is obtained: σ = e2ncτ/M*, where M* is the magnetotransport mass distinct from the cyclotron mass, nc the density of the conduction electrons, and τ the relaxation time. The density nc depends on the magnetic field direction relative to copper's fcc lattice, when Cu's Fermi surface is nonspherical with “necks”. The anisotropic magnetoresistance is analyzed based on a one-parameter model, and compared with experiments. A good fit is obtained.
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ZIMBOVSKAYA, NATALYA, GODFREY GUMBS, and JOSEPH L. BIRMAN. "THEORY OF THE DC MAGNETOTRANSPORT IN LATERALLY MODULATED QUANTUM HALL SYSTEMS NEAR FILLING ν=½." International Journal of Modern Physics B 18, no. 10n11 (April 30, 2004): 1581–94. http://dx.doi.org/10.1142/s0217979204024793.

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A quasiclassical theory for DC magnetotransport in a modulated quantum Hall system near filling factor ν=½ is presented. A weak one-dimensional electrostatic potential acts on the two-dimensional electron gas. Closed form analytic expressions are obtained for the resistivity ρ⊥ corresponding to a current at right angles to the direction of the modulation lines as well as a smaller component ρ‖ for a current along the direction of the modulation lines. It is shown that both resistivity components are affected by the presence of the modulation. Numerical results are presented for ρ⊥ and ρ‖ and show reasonable agreement with the results of recent experiments.
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LEWIS, R. A., W. XU, P. M. KOENRAAD, and I. V. BRADLEY. "EFFECT OF STRONG TERAHERTZ RADIATION ON MAGNETOCONDUCTIVITY IN TWO DIMENSIONS." International Journal of Modern Physics B 16, no. 20n22 (August 30, 2002): 2964–67. http://dx.doi.org/10.1142/s0217979202013328.

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The interaction between strong THz radiation from a free electron laser and an electron sheet in a high-mobility, low-density, GaAs/AlGaAs structure has been investigated in magnetotransport experiments over a wide range of wavelengths, intensities, magnetic fields, and temperatures. Photovoltage and photocurrent effects are evident in both longitudinal and transverse potential differences. Broad cyclotron resonance is observed to high temperature and connected with a decrease in electron density. The change in electron temperature under THz radiation is estimated from changes in the magnitude of the magnetoresistivity oscillations at low lattice temperature. The effect of the magnetic field is to suppress the rise in electron temperature relative to the zero field case.
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Greene, S. K., J. Singleton, P. Sobkowicz, T. D. Golding, M. Pepper, J. A. A. J. Perenboom, and J. Dinan. "Subband occupancies and zero-field spin splitting in InSb-CdTe heterojunctions: magnetotransport experiments and self-consistent calculations." Semiconductor Science and Technology 7, no. 11 (November 1, 1992): 1377–85. http://dx.doi.org/10.1088/0268-1242/7/11/016.

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Dissertations / Theses on the topic "Magnetotransport experiments"

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Moseley, Dominic. "Magnetotransport experiments in the ferropnictides." Thesis, Imperial College London, 2014. http://hdl.handle.net/10044/1/24798.

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This thesis concerns the magnetotransport properties of the iron-based superconductors, and in particular, the ferropnictides. In the low doped ferropnictides, linked structural and magnetic transitions occur which significantly alter the electronic behaviour. Simultaneous to the establishment of the magnetic ordering is the creation of small Fermi surface pockets. It has been shown that some of these Fermi surface pockets have Dirac Cone characteristics. The primary work in this thesis focuses on the existence of non-saturating quasi-linear magnetoresistance in the underdoped ferropnictides. This feature has been seen as the hallmark of Dirac cone physics due to the commonly applied quantum linear magnetoresistance model. We have explored this hypothesis by performing a series of magnetotransport experiments using the van der Pauw method on undoped BaFe$_{2}$As$_{2}$, low cobalt doped BaFe$_{1.985}$Co$_{0.015}$As$_{2}$ and superconducting BaFe$_{1.96}$Co$_{0.04}$As$_{2}$. Scattering centres have been systematically introduced using 3-MeV proton irradiation. The quantum linear magnetoresistance model predicts the quasi-linear magnetoresistance should vary with carrier scattering. We describe these experiments, and draw the conclusion that the quantum linear magnetoresistance model is incorrectly applied. Other models to explain the quasi-linear magnetoresistance are reviewed. Speculation as to the cause of magnetic hysteresis in the magnetoresistance found in some of the parent crystals studied is presented. The Hall resistivity in the parent and underdoped ferropnictides shows a clear non-linear response suggesting that the single carrier model is invalid. We find that the Hall resistivity is insensitive to the introduction of disorder. Various models are reviewed including the anomalous Hall Effect and the antiferromagnetism related anisotropic quasiparticle lifetime model. Furthermore, magnetotransport scaling techniques are considered. Only the modified Kohler's rule is satisfied and this is shown to have an intriguing Co doping dependence.
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Howell, D. F. "Studies of two-dimensional electron systems in semiconductors at high magnetic fields." Thesis, University of Oxford, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.253390.

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Geishendorf, Kevin [Verfasser], Kornelius [Akademischer Betreuer] Nielsch, Kornelius [Gutachter] Nielsch, and Georg [Gutachter] Woltersdorf. "Magnetotransport Experiments in Co₃Sn₂S₂ Microstructures : Magnetotransport Experimente in Co3Sn2S2 Mikrostrukturen / Kevin Geishendorf ; Gutachter: Kornelius Nielsch, Georg Woltersdorf ; Betreuer: Kornelius Nielsch." Dresden : Technische Universität Dresden, 2020. http://d-nb.info/1227311044/34.

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Betthausen, Christian [Verfasser], and Dieter [Akademischer Betreuer] Weiss. "Spin effects in high- and low-field magnetotransport experiments in semimagnetic Cd(1-x)Mn(x)Te heterostructures / Christian Betthausen. Betreuer: Dieter Weiss." Regensburg : Universitätsbibliothek Regensburg, 2012. http://d-nb.info/1030179506/34.

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Pezzotta, Mike [Verfasser], Markus [Akademischer Betreuer] Morgenstern, and Bert [Akademischer Betreuer] Voigtländer. "A compact all-UHV 3He-system for combined scanning probe and magnetotransport experiments down to 400 mK / Mike Pezzotta ; Markus Morgenstern, Bert Voigtländer." Aachen : Universitätsbibliothek der RWTH Aachen, 2018. http://d-nb.info/1170780032/34.

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Lye, Beng Chye. "An experimental study of AlGaInP/GaAs/GaAs and GaInP/AlGaAs/GaInP heterojunction bipolar transistors." Thesis, University of Sheffield, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.286877.

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Fisher, Ian Randal. "An experimental study of magnetotransport properties of several new superconductors." Thesis, University of Cambridge, 1997. https://www.repository.cam.ac.uk/handle/1810/251609.

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Fisher, I. R. "An experimental study of the magnetotransport properties of several new superconductors." Thesis, University of Cambridge, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.599047.

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The magnetotransport properties of three new superconducting compounds (Y1-xCaxBa2Cu3O7-δ, TI2Ba2CuO6+δ and RNi2B2C) have been investigated. The study has principally involved measurements of the anisotropic resistivity, magnetoresistance, and Hall effect of these compounds. Results for sintered and thin film samples of Y1-xCaxBa2Cu3O7-δ are presented. The Hall coefficient of the fully oxygenated overdoped material is smaller in magnitude and has a weaker temperature dependence than that of optimally doped material, while the resistivity has an upward curvature and can be well fitted by A + BT + CT2. Despite these large changes in ρ and RH, cot(θH) shows remarkably little variation with doping, as is also the case for underdoped YBa2Cu3O7-δ. By fitting the small downturn in the resistivity above Tc to 3D Gaussian fluctuation theory, it is possible to estimate the c-axis coherence length ξc, and it is shown that the planar hole concentration has a much stronger effect on ξc than had previously been thought. In addition, it is shown that overdoping Y1-xCaxBa2Cu3O7-δ causes the mixed-state resistivity to mainly shift rather than broaden in applied magnetic fields. Measurements of the c-axis magnetoresistance of single crystals of TI2Ba2CuO6+δ(TI-2201) reveal a striking four-fold angular dependence as the magnetic field is rotated in the ab-plane. A metallic c-axis resistivity (dρc/dT > 0) indicates that the out-of-plane transport may be coherent, and based on this assumption a simple model with an anisotropic relaxation time τ is developed. Calculations based on this model using Boltzmann transport theory are used to interpret the data and obtain values of the mean free path for carrier motion parallel and perpendicular to the CuO2 planes. Although the ab-plane value is consistent with other estimates, the c-axis mean free path is smaller than the distance between adjacent CuO2 planes (in the experimental temperature range). In addition, it is shown that changes in the anisotropy in τ with temperature cannot fully account for the observed temperature dependence of the in-plane Hall coefficient.
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Geishendorf, Kevin. "Magnetotransport Experiments in Co₃Sn₂S₂ Microstructures." 2020. https://tud.qucosa.de/id/qucosa%3A72645.

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Weyl semimetals feature linear band crossings with non-trivial topological properties. These (Weyl) points can have a strong impact on the transport response, when they are located close to the Fermi level. The Weyl points can lead to, among other things, a large anomalous Hall effect. Co3Sn2S2 is a prototypical candidate of this material class and displays intriguing physics, originating from its topological as well as magnetic properties. Many interesting transport responses, including the anomalous Hall effect and the anomalous Nernst effect have been found to be realised in this compound. Previous experiments have been carried out exclusively in (bulk) single crystals of Co3Sn2S2. It is demonstrated in this thesis, that microsturctures with well defined contacts can fabricated from bulk single crystals using focused ion beam cutting. Laser lithography is employed to define the electrical contacts to the micro ribbons. The microstructured devices are used to study the evolution of the magnetoresistance and magnetothermopower with magnetic field and temperature. The magnetoelectric transport response in Co3Sn2S2 is addressed in the first part of this thesis. Co3Sn2S2 exhibits a particularly large anomalous Hall effect in the transverse magnetoresistance. The anomalous Hall conductivity is found to be independent of the longitudinal conductivity, suggesting an intrinsic origin of the anomalous Hall effect. This notion is further corroborated by comparing the experimental results with band structure calculations, using the Berry curvature. Furthermore, the agreement between measurements on the microstructures with measurements on single crystals demonstrates the high quality of the microstructured devices. Additionally to the transverse magnetoresistance also the longitudinal magnetoresistance of Co3Sn2S2 is studied. The magnetoresistance decreases with increasing magnetic field for temperatures above 100 K. Futhermore, the magnetoresistance is found to be highly anisotropic with respect to the direction of the magnetic field. The negative magnetoresistance can be consistently explained invoking the magnon magnetoresistance. This effect is present in the ferromagnetic as well as the paramagnetic phase and is the dominant magnetoresistance effect above 100 K. The remarkably strong magneto-crystalline anisotropy of Co3Sn2S2 along its crystalline c-axis leads to the interesting observation, that the magnon magnetoresistance appears to depend on the projection of the external magnetic field on the magnetization. At low temperatures, magnon modes are frozen out and the magnon magnetoresistance vanishes. However, the anisotropy of the carrier mobilities gives rise to an anisotropic orbital magnetoresistance. Interestingly, no clear signs of crystalline/non-crystalline anisotropic magnetoresistance, depending on the magnetization direction, can be observed. The salient features in the magnetoelectric response can be understood through the comprehensive investigations reported in this thesis. In the second part, the thermal counterparts of the magnetoelectric transport responses are investigated. Again, a surprisingly large transverse (Nernst) effect is found. The Nernst conductivity reaches up to 4 A/(m K) in Co3Sn2S2. Unlike their magnetoelectric counterparts, the Nernst coefficient and the Nernst conductivity exhibit a sign change as a function of temperature. These experimental results strengthen the theoretical framework, that the anomalous Hall and Nernst effect probe different states. Furthermore, an additional contribution at the magnetic phase transition can be identified using the Mott relation. This contribution indicates that the anomalous Nernst conductivity can be enhanced by magnetic fluctuations near the magnetic ordering temperature. It appears to be a generic contribution in ferromagnetic materials and it is so far not accounted for by this particular formulation of the Mott relation. This subtle feature is uncovered when comparing the large magnetoelectric and magnetothermal transport response in the magnetic Weyl semimetal Co3Sn2S2.
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Book chapters on the topic "Magnetotransport experiments"

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Kraus, M., H. Mrotzek, N. Steinmetz, E. Bangert, G. Landwehr, and G. Remenyi. "Tilted Field Magnetotransport Experiments on Germanium Bicrystals." In High Magnetic Fields in Semiconductor Physics II, 194–98. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-642-83810-1_31.

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Bass, Jack. "Magnetotransport (Experimental)." In Magnetic Interactions and Spin Transport, 219–312. Boston, MA: Springer US, 2003. http://dx.doi.org/10.1007/978-1-4615-0219-7_4.

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Conference papers on the topic "Magnetotransport experiments"

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Jin, C., M. Tang, and H. Bai. "Cation effect on the magnetic and magnetotransport properties of CoxFe3−xO4 films: An experimental and first-principles study." In 2015 IEEE International Magnetics Conference (INTERMAG). IEEE, 2015. http://dx.doi.org/10.1109/intmag.2015.7156906.

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