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Magnetization of two-dimensional heavy holes with boundaries in a perpendicular magnetic field 下载免费PDF全文
The magnetisation of heavy holes in III--V semiconductor quantum
wells with Rashba spin-orbit coupling (SOC) in an external
perpendicular magnetic field is studied theoretically. We
concentrate on the effects on the magnetisation induced by the
system boundary, the Rashba SOC and the temperature. It is found
that the sawtooth-like de Haas--van Alphen (dHvA) oscillations of
the magnetisation will change dramatically in the presence of such
three factors. Especially, the effects of the edge states and Rashba
SOC on the magnetisation are more evident when the magnetic field is
smaller. The oscillation center will shift when the boundary effect
is considered and the Rashba SOC will bring beating patterns to the
dHvA oscillations. These effects on the dHvA oscillations are
preferably observed at low temperatures. With increasing
temperature, the dHvA oscillations turn to be blurred and eventually
disappear. 相似文献
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This paper theoretically investigates the orbital
magnetization of electron-doped (n-type) semiconductor
heterostructures and of hole-doped (p-type) bulk semiconductors,
which are respectively described by a two-dimensional electron/hole
Hamiltonian with both the included Rashba spin--orbit coupling and
Zeeman splitting terms. It is the Zeeman splitting, rather than the
Rashba spin--orbit coupling, that destroys the time-reversal
symmetry of the semiconductor systems and results in nontrivial
orbital magnetization. The results show that the magnitude of the
orbital magnetization per hole and the Hall conductance in the
p-type bulk semiconductors are about 10-2--10-1 effective
Bohr magneton and 10-1--1 e2/h, respectively. However,
the orbital magnetization per electron and the Hall conductance in
the n-type semiconductor heterostructures are too small to be easily
observed in experiment. 相似文献
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