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Electronic double refraction due to the Rashba effect: Analytical and numerical results
SHAO Peng-rui, SHAO Peng-rui, DENG Wen-ji, DENG Wen-ji
Frontiers of Physics in China - Selected Publications from Chinese Universities. 2007, 2 (1): 44-50.
https://doi.org/10.1007/s11467-007-0015-6
By analogy with the classic effect of the double refraction of light, we investigate the relevant effect of an electron entering from the Non-Rashba region to the Rashba region in two-dimensional systems. It is shown that the effect of electronic double refraction is determined by a combined parameter λ=m*λFα/2πh2, rather than both the Rashba coefficient α and wavelength λF of a Fermi electron, separately. For the case of normal incidence, the analytical expressions for the wavefunction of the electron are presented; it is predicted that the Rashba spin-orbit coupling can induce a current perpendicular to the normal incident direction of the electron. Moreover, the general case of incident electron with any given momentum and spin state are studied numerically in detail, including the abrupt changes of spin direction and the two-step characters for reflection.
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Another model for a multiexcitonic quantum dot in an optical microcavity
SHAN Guang-cun, BAO Shu-ying, HUANG Wei
Frontiers of Physics in China - Selected Publications from Chinese Universities. 2007, 2 (1): 63-67.
https://doi.org/10.1007/s11467-007-0014-7
Very recently, a multiexcitonic quantum dot in an optical microcavity have been theoretically studied [Herbert Vincka, Boris A. Rodriguez, and Augusto Gonzalez, Physica E, 2006, 35: 99-102]. However, due to the inevitable damping losses through the microcavity, in this work, we will present a more precise and sound model in the Lindblad form master equation to investigate the photonic properties of a single quantum dot (QD) in an optical microcavity system, in which the QD may confine the multiexcitons and be in resonant interaction with a single photonic mode of an optical microcavity. The excitation energies, and the properties of the emission photon from the QD microcavity are computed as functions of the exciton-photon coupling strength, detuning, and pump rate. We further compare our results with their results, and find that the calculated intensity of the emitted photon and the spectra crucially depend on the exciton-photon coupling strength g, the photon detuning, and the number of excitons in the QD. Finally, we will give a physical mechanism of the dressed-state picture for the strong coupling between the single mode of an optical microcavity and the QD emitters to explain the details of the emission photon spectra. Our study establishes useful guidelines for the experimental study of such multiexcitonic quantum dot in an optical microcavity system.
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First-principle studies on the electronic structure of Fe3O4(110) surface
LI Yan-li, LIU Zu-li, YAO Kai-lun
Frontiers of Physics in China - Selected Publications from Chinese Universities. 2007, 2 (1): 76-80.
https://doi.org/10.1007/s11467-007-0008-5
The first-principle was employed to study the six possible models for the Fe3O4 (110) surface, namely the AB-terminated surface (AB model), the AB-terminated with FeA vacancy (AB-FeA vac model), the AB-terminated with FeB vacancy (AB-FeB vac model), the B-terminated surface (B model), the B-terminated surface with FeB vacancy (B-FeB vac model) and the B-terminated surface with O vacancy (B-O vac model). The stability, the electronic structure and the magnetic properties of the six surface models were also calculated. The results predict that the B-O vac model is more stable than other types of surface models. The half-metallic property remain in the AB and B models, while the other four surface models exhibit metallic properties. At the same time, the AB, AB-FeA vac, AB-FeB vac, B and the B-FeB vac models have ferrimagnetic properties, while the B-O vac model has antiferromagnetic property.
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Sonochemical preparation and characterization of photochromic MoO3 nanoparticles
CHEN Jiu-ju, YANG Hai-bin, CHANG Lian-xia, FU Wu-you, ZENG Yi, ZHU Hong-yang, ZOU Guang-tian
Frontiers of Physics in China - Selected Publications from Chinese Universities. 2007, 2 (1): 92-95.
https://doi.org/10.1007/s11467-007-0013-8
The effect of ultrasound irradiation on molybdenum trioxide has been investigated. Under ultrasonic irradiation, spherical-like MoO3 nanoparticles were obtained, while bulk-like MoO3 nanoparticles were prepared without ultrasonic irradiation. The changes in the physicochemical properties of MoO3 have been investigated using techniques such as X-ray powder diffraction (XRD), field emission scanning electron microscopy (FE-SEM) and ultraviolet and visible spectroscopy (UV-vis). The physicochemical changes of MoO3 due to ultrasound irradiation have been attributed to the sonochemical cavity collapse onto the molybdenum trioxide particles. The ultrasonically prepared particles can also greatly improve the photochromism efficiency.
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O (n ) tricriticality in two dimensions
GUO Wen-an, Henk W.J. Ble, Bernard Nienhuis
Frontiers of Physics in China - Selected Publications from Chinese Universities. 2007, 2 (1): 103-108.
https://doi.org/10.1007/s11467-007-0010-y
We present exact results for several universal parameters of the tricritical O (n) model in two dimensions. The results apply to the range -2"dn"d3/2, and include the central charge and three scaling dimensions, associated with temperature, magnetic field and the introduction of an interface. Since these results are based on an extrapolation of known relations between the O (n) and the Potts model, they cannot be considered as rigorous. For this reason, we perform an accurate numerical analysis of the central charge and the critical exponents. This analysis, which is based on transfer-matrix calculations on the honeycomb lattice, is in a full and precise agreement with the theoretical predictions.
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