Two-dimensional semimetal in a wide HgTe quantum well: magnetotransport and energy spectrum

Abstract

The results of experimental study of the magnetoresistivity, the Hall and Shubnikov-de Haas effects for the heterostructure with HgTe quantum well of 20.2 nm width are reported. The measurements were performed on the gated samples over the wide range of electron and hole densities including vicinity of a charge neutrality point. Analyzing the data we conclude that the energy spectrum is drastically different from that calculated in framework of $kP$-model. So, the hole effective mass is equal to approximately $0.2m_0$ and practically independent of the quasimomentum ($k$) up to $k^2\gtrsim 0.7\times 10^{12}$ cm${}^{-2}$, while the theory predicts negative (electron-like) effective mass up to $k^2=6\times 10^{12}$ cm${}^{-2}$. The experimental effective mass near k=0, where the hole energy spectrum is electron-like, is close to $-0.005m_0$, whereas the theoretical value is about $-0.1m_0$.

References in corpus (8)

• Quantum Spin Hall Effect and Topological Phase Transition in HgTe Quantum Wells
• Quantum Spin Hall Insulator State in HgTe Quantum Wells
• Nonlocal edge state transport in the quantum spin Hall state
• Helical edge resistance introduced by charge puddles
• Inelastic electron backscattering in a generic helical edge channel
• Fine structure of "zero-mode" Landau levels in HgTe/HgCdTe quantum wells
• Symmetries and weak (anti)localization of Dirac fermions in HgTe quantum wells
• Unconventional Hall effect near charge neutrality point in a two-dimensional electron-hole system

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