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The effect of a dynamo-generated mean magnetic field of Beltrami type on the mean electromotive force is studied. In the absence of the mean magnetic field the turbulence is assumed to be homogeneous and isotropic, but it becomes…

天体物理学 · 物理学 2008-10-20 A. Brandenburg , K. -H. Rädler , M. Rheinhardt , K. Subramanian

Using magneto-optical imaging the phenomenon of dendritic flux penetration in superconducting films was studied. Flux dendrites were abruptly formed in a 300 nm thick film of MgB2 by applying a perpendicular magnetic field. Detailed…

超导电性 · 物理学 2009-11-07 F. L. Barkov , D. V. Shantsev , T. H. Johansen , P. E. Goa , W. N. Kang , H. J. Kim , E. M. Choi , S. I. Lee

We present the results of simulations of forced turbulence in a slab where the mean kinetic helicity has a maximum near the mid-plane, generating gradients of magnetic helicity of both large and small-scale fields. We also study systems…

太阳与恒星天体物理 · 物理学 2010-11-30 A. Hubbard , A. Brandenburg

We present the magnetic field dependencies of transport properties for $R$PtBi ($R$ = Gd, Dy, Tm, and Lu) half-Heusler compounds. Temperature and field dependent resistivity measurements of high quality $R$PtBi single crystals reveal an…

强关联电子 · 物理学 2016-03-30 Eundeok Mun , Sergey L. Bud'ko , Paul C. Canfield

A mean field calculation of the $T\to 0$ limit of the Hall conductance of electron-doped cuprates such as $Pr_{2-x}Ce_xCuO_{4+\delta}$ is presented. The data are found to be qualitatively consistent with the reconstruction of the Fermi…

强关联电子 · 物理学 2009-11-11 Jie Lin , A. J. Millis

The carrier spin and impurity spin densities in diluted magnetic semiconductors are considered using a semiclassical approach. Equations of motions for the spin densities and the carrier spin current density in the paramagnetic phase are…

材料科学 · 物理学 2009-11-10 C. Timm , F. von Oppen , F. Höfling

We study magnetotransport in conical helimagnet crystals. Spin dependent magnetoresistance exhibits dramatic properties for high and low electron concentrations at different temperatures. For spin up electrons we find negative…

介观与纳米尺度物理 · 物理学 2024-04-03 Raz Rivlis , Andrei Zadorozhnyi , Yuri Dahnovsky

Recent thermodynamic measurements on two-dimensional (2D) electron systems have found diverging behavior in the magnetic susceptibility and appearance of ferromagnetism with decreasing electron density. The critical densities for these…

强关联电子 · 物理学 2007-05-23 S. M. Fazeli , K. Esfarjani , B. Tanatar

The possibility of significant increase of generated pulsed magnetic fields by the inductor system of a single-turn solenoid and magnetic flux concentrator without initialization of low-cycle fatigue mechanism is theoretically studied by…

计算物理 · 物理学 2025-05-26 P. A. Russkikh , G. Sh. Boltachev

We present a systematical study of thermal Hall effect on a bismuth single crystal by measuring resistivity, Hall coefficient, and thermal conductivity under magnetic field, which shows a large thermal Hall coefficient comparable to the…

材料科学 · 物理学 2015-06-04 W. Kobayashi , Y. Koizumi , Y. Moritomo

Electroaerodynamic (EAD) propulsion, where thrust is produced by collisions between electrostatically-accelerated ions and neutral air, is a potentially transformative method for indoor flight owing to its silent and solid-state nature.…

机器人学 · 计算机科学 2023-09-21 Grant Nations , C. Luke Nelson , Daniel S. Drew

Hall effects have been employed as sensitive detectors of magnetic fields and magnetizations. In spintronics, exotic phenomena often emerge from a non-equilibrium spin polarization or magnetization, that is very difficult to measure…

介观与纳米尺度物理 · 物理学 2016-08-04 Dazhi Hou , Z. Qiu , R. Iguchi , K. Sato , K. Uchida , G. E. W. Bauer , E. Saitoh

We derive a generalized set of Ward identities that captures the effects of topological charge on Hall transport. The Ward identities follow from the 2+1 dimensional momentum algebra, which includes a central extension proportional to the…

强关联电子 · 物理学 2016-09-13 Bom Soo Kim , Alfred D. Shapere

The density profiles of dark halos are usually inferred from the rotation curves of disk galaxies based on the assumption that the gas is a good tracer of the gravitational potential of the galaxies. Some authors have suggested that…

天体物理学 · 物理学 2009-11-10 F. J. Sanchez-Salcedo , M. Reyes-Ruiz

The nonlinear evolution of the magnetorotational instability (MRI) in weakly ionized accretion disks, including the effect of the Hall term and ohmic dissipation, is investigated using local three-dimensional MHD simulations and various…

天体物理学 · 物理学 2009-11-07 Takayoshi Sano , James M. Stone

A model calculation is presented to characterize the anomalous cross-field transport of electrons in a Hall thruster geometry. The anomalous nature of the transport is attributed to the chaotic dynamics of the electrons arising from their…

等离子体物理 · 物理学 2020-03-18 D. Mandal , Y. Elskens , N. Lemoine , F. Doveil

Shuttling of electrons in single-molecule transistors with magnetic leads in the presence of an external magnetic field is considered theoretically. For a current of partially spin-polarized electrons a shuttle instability is predicted to…

介观与纳米尺度物理 · 物理学 2015-07-22 O. A. Ilinskaya , S. I. Kulinich , I. V. Krive , R. I. Shekhter , Y. W. Park , M. Jonson

We investigate the properties of strange quark matter in a strong magnetic field with quark confinement by the density dependence of quark mass considering the total baryon number conservation, charge neutrality and chemical equilibrium.…

核理论 · 物理学 2015-06-19 J. X. Hou , G. X. Peng , C. J. Xia , J. F. Xu

A Kubo inspired formalism is proposed to compute the longitudinal and transverse dynamical conductivities of an electron in a plane (or a gas of electrons at zero temperature) coupled to the potential vector of an external local magnetic…

介观与纳米尺度物理 · 物理学 2009-10-28 Jean Desbois , Stéphane Ouvry , Christophe Texier

We present first numerical studies of the disorder effect on the recently proposed intrinsic spin Hall conductance in a three dimensional (3D) lattice Luttinger model. The results show that the spin Hall conductance remains finite in a wide…

介观与纳米尺度物理 · 物理学 2007-05-23 W. Q. Chen , Z. Y. Weng , D. N. Sheng