Magnetic Susceptibility Measurements in HgTe Quantum Wells in a Perpendicular Magnetic Field

Kuntsevich, A. Yu.; Tupikov, E.; Dvoretsky, S. A.; Михайлов, Н. Н.; Резников, М.

doi:10.1134/s0021364020110041

Cited by 4 publications

(1 citation statement)

References 30 publications

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“…As a result, features in magnetization anticipated at field of the full spin polarization were revealed. Besides 2D electron system in Si, using this method, thermodynamic properties of electrons were measured in GaAs heterostructures [121,122] and in HgTe quantum wells [123]. The main physical results of these measurements are discussed in section VI B 2.…”

Section: Modulation Capacitive Methods Of Measuring Chemical Potentia...mentioning

confidence: 99%

Measurements of the magnetic properties of conduction electrons

Pudalov

2021

Phys.-Usp.

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We consider various methods and techniques for measuring electron magnetization and susceptibility, which are used in experimental condensed matter physics. The list of considered methods for macroscopic measurements includes magnetomechanic, electromagnetic, modulation-type, and also thermodynamic methods based on the chemical potential variation measurements. We also consider local methods of magnetic measurements based on the spin Hall effects, NV-centers. Several scanning probe magnetometers-microscopes are considered, such as magnetic resonance force microscope, SQUID-microscope, and Hall microscope. The review focuses on the spin magnetization measurements of electrons in non-magnetic materials and artificial systems, particularly, in lowdimensional electron systems in semiconductors and in nanosystems, which came to the forefront in recent years.

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Section: Modulation Capacitive Methods Of Measuring Chemical Potentia...mentioning

confidence: 99%

Measurements of the magnetic properties of conduction electrons

Pudalov

2021

Phys.-Usp.

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Splitting of the Spectrum of Fermionic Excitations in a Topological Insulator by Charge Fluctuations

Вальков

2021

Jetp Lett.

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Energy Spectrum of the Valence Band in HgTe Quantum Wells on the Way from a Two- to Three-Dimensional Topological Insulator

Minkov,

Rut,

Sherstobitov

et al. 2023

Jetp Lett.

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The magnetic field and temperature dependences of longitudinal magnetoresistance and the Hall effect have been measured in order to determine the energy spectrum of the valence band in HgTe quantum wells with the width dQW = 20–200 nm. The comparison of hole densities determined from the period of Shubnikov–de Haas oscillations and the Hall effect shows that states at the top of the valence band are doubly degenerate in the entire dQW range, and the cyclotron mass $${{m}_{h}}$$ determined from the temperature dependence of the amplitude of Shubnikov–de Haas oscillation increases monotonically from $$0.2{{m}_{0}}$$ to $$0.3{{m}_{0}}$$ ($${{m}_{0}}$$ is the mass of the free electron) with increasing hole density $$p$$ from $$2 \times {{10}^{{11}}}$$ to $$6 \times {{10}^{{11}}}$$ cm–2. The determined dependence has been compared to theoretical dependences $${{m}_{h}}(p,{{d}_{{{\text{QW}}}}})$$ calculated within the four-band kP model. These calculations predict an approximate stepwise increase in $${{m}_{h}}$$ owing to the pairwise merging of side extrema with increasing hole density, which should be observed at $$p = (4{-} 4.5) \times {{10}^{{11}}}$$ and 4 × 1010 cm–2 for dQW = 20 and 200 nm, respectively. The experimental dependences are strongly inconsistent with this prediction. It has been shown that the inclusion of additional factors (electric field in the quantum well, strain) does not remove the contradiction between the experiment and theory. Consequently, it is doubtful that the mentioned kP calculations adequately describe the valence band at all dQW values.

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Magnetic Susceptibility Measurements in HgTe Quantum Wells in a Perpendicular Magnetic Field

Cited by 4 publications

References 30 publications

Measurements of the magnetic properties of conduction electrons

Measurements of the magnetic properties of conduction electrons

Splitting of the Spectrum of Fermionic Excitations in a Topological Insulator by Charge Fluctuations

Energy Spectrum of the Valence Band in HgTe Quantum Wells on the Way from a Two- to Three-Dimensional Topological Insulator

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