Micromechanical cantilever magnetometer with an integrated two-dimensional electron system

Schwarz, M. P.; Grundler, D.; Meinel, I.; Heyn, Ch.; Heitmann, D.

doi:10.1063/1.126708

Cited by 59 publications

(52 citation statements)

References 11 publications

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“…If the substrate is flexible, the edge torques should deform it (figure 13), and measurement of this deformation would provide a method to detect equilibrium spin currents experimentally. An appropri-ate experimental technique for such a measurement is already known: a mechanical cantilever magnetometer with an integrated 2D electron system [128]. Earlier mechanical detectors were suggested for detection of non-equilibrium diffusion spin currents [129].…”

Section: Experimental Detection Of Equilibrium Spin Currentsmentioning

confidence: 99%

Spin currents and spin superfluidity

Sonin

2010

Advances in Physics

240

300

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The present review analyzes and compares various types of dissipationless spin transport: (1) Superfluid transport, when the spin-current state is a metastable state (a local but not the absolute minimum in the parameter space). (2) Ballistic spin transport, when spin is transported without losses simply because sources of dissipation are very weak. (3) Equilibrium spin currents, i.e., genuine persistent currents. (4) Spin currents in the spin Hall effect. Since superfluidity is frequently connected with Bose condensation, recent debates about magnon Bose condensation are also reviewed. For any type of spin currents simplest models were chosen for discussion in order to concentrate on concepts rather than details of numerous models. The various hurdles on the way of using the concept of spin current (absence of the spin-conservation law, ambiguity of spin current definition, etc.) were analyzed. The final conclusion is that the spin-current concept can be developed in a fully consistent manner, and is a useful language for description of various phenomena in spin dynamics.

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Section: Experimental Detection Of Equilibrium Spin Currentsmentioning

confidence: 99%

Spin currents and spin superfluidity

Sonin

2010

Advances in Physics

240

300

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“…For instance, Meinel et al [2][3][4] developed dc superconducting quantum interference device magnetometers to study the dHvA oscillations in high-mobility semiconductor 2DEG. Schwarz et al [5][6][7] studied the dHvA oscillations by using micromechanical cantilever magnetometers. Besides the purely orbital part, prominently, the influence [8] of the weak Rashba spin-orbit interaction (SOI) on the dHvA oscillations in the magnetization of the semiconductor 2DEG can also be effectively determined in experiment [9], which therefore opens a new door to measurement of the spintronic parameters in semiconductor heterostructures.…”

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confidence: 99%

Magnetic quantum oscillations for the surface states of topological insulatorBi2Se3

Wang

et al. 2010

Phys. Rev. B

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We study quantum oscillations of the magnetization in Bi 2 Se 3 (111) surface system in the presence of a perpendicular magnetic field. The combined spin-chiral Dirac cone and Landau quantization produce profound effects on the magnetization properties that are fundamentally different from those in the conventional semiconductor two-dimensional electron gas. In particular, we show that the oscillating center in the magnetization chooses to pick up positive or negative values depending on whether the zero-mode Landau level is occupied or empty. An intuitive analysis of these new features is given and the subsequent effects on the magnetic susceptibility and Hall conductance are also discussed.

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“…The sensor was micromachined from undoped AlGaAs/GaAs layers grown by molecular-beam epitaxy similar to the procedure described in Ref. 21. The 2DES had an area of 0.8 ϫ 1.6 mm 2 and resided in a separate 20 m-thick sample piece that was glued to the end of the flexible cantilever beam.…”

Section: Methodsmentioning

confidence: 99%

De Haas-van Alphen effect and energy gaps of a correlated two-dimensional electron system in an AlAs two-valley pseudospin system

et al. 2009

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We report highly sensitive de Haas-van Alphen ͑dHvA͒ effect measurements on a high-mobility twodimensional electron system in an AlAs quantum well. Here two valleys are occupied forming a pseudospin system. At 400 mK, the dHvA effect shows pronounced oscillations at filling factors = 1 to four. In the quantum limit at = 1 the data are consistent with an interaction-enhanced valley splitting, which exceeds the Zeeman spin splitting in a perpendicular field B. When tilting B the energy gap ⌬E at = 1 shows first an unexpectedly strong angular dependence and then remains constant. This suggests a crossover in the energy gap, most likely from a spin to a pseudospin gap. We attribute the strong initial dependence of ⌬E on the tilt angle to skyrmion-type spin excitations. Surprisingly, the dHvA oscillation amplitudes do not display coincidence phenomena at higher filling factors. This is explained by the large valley splitting and avoided crossings of energy levels.

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Micromechanical cantilever magnetometer with an integrated two-dimensional electron system

Cited by 59 publications

References 11 publications

Spin currents and spin superfluidity

Spin currents and spin superfluidity

Magnetic quantum oscillations for the surface states of topological insulatorBi2Se3

De Haas-van Alphen effect and energy gaps of a correlated two-dimensional electron system in an AlAs two-valley pseudospin system

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