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31 papers · 2 filters
Topological edge states and quantum Hall effect in the Haldane model
Ningning Hao, Ping Zhang, Zhigang Wang +2
We study the topological edge states of the Haldane's graphene model with zigzag/armchair lattice edges. The Harper equation for solving the energies of the edge states is derived.…
Theory of electron Zitterbewegung in graphene probed by femtosecond laser pulses
Tomasz M. Rusin, Wlodek Zawadzki
We propose an experiment allowing an observation of Zitterbewegung (ZB, trembling motion) of electrons in graphene in the presence of a magnetic field. In contrast to the existing…
Topological insulator: a new quantized spin Hall resistance robust to dephasing
Hua Jiang, Shuguang Cheng, Qing-feng Sun +1
The influence of dephasing on the quantum spin Hall effect (QSHE) is studied. In the absence of dephasing, the longitudinal resistance in a QSHE system exhibits the quantum plateau…
Spin Bias Measurement Based on a Quantum Point Contact
Yanxia Xing, Qing-feng Sun, Jian Wang
Electron charge transport through a quantum point contact (QPC) driven by an asymmetric spin bias is studied. A large charge current is induced when the transmission coefficient of…
Theoretical backgrounds of nonlinear THz spectroscopy of semiconductor superlattices
Alexey V. Shorokhov, Kirill N. Alekseev
We consider terahertz absorption and gain in a single miniband of semiconductor superlattice subject to a bichromatic electric field in the most general case of commensurate freque…
Spin currents in diluted magnetic semiconductors (extended version)
S. D. Ganichev, S. A. Tarasenko, V. V. Bel'kov +8
Spin currents resulting in the zero-bias spin separation have been observed in unbiased diluted magnetic semiconductor structures (Cd,Mn)Te/(Cd,Mg)Te. The pure spin current generat…