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9,691 results on '"GUO Peng"'

209. Charged particles interaction in both a finite volume and a uniform magnetic field II: topological and analytic properties of a magnetic system

Author

Guo, Peng and Gasparian, Vladimir

Subjects
High Energy Physics - Lattice, High Energy Physics - Phenomenology
Abstract

In present work, we discuss some topological features of charged particles interacting a uniform magnetic field in a finite volume. The edge state solutions are presented, as a signature of non-trivial topological systems, the energy spectrum of edge states show up in the gap between allowed energy bands. By treating total momentum of two-body system as a continuous distributed parameter in complex plane, the analytic properties of solutions of finite volume system in a magnetic field is also discussed.

Published
2021
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230. 2-(3-Oxo-1,3-dihydroisobenzofuran-1-yl)phthalazin-1(2H)-one

Author

Hong Deng, Guo Peng, Yu-Jun Wu, and You-Lei Zhang

Subjects
Crystallography, QD901-999
Abstract

The reaction of 2-carboxybenzaldehyde and hydrazine hydrate unexpectedly yielded the title compound, C16H10N2O3, which comprises one phthalide ring, one phthalazine system and a chiral centre. The phthalide unit is almost perpendicular to the phthalazine system, forming a dihedral angle of 87.1 (3)°. The packing is governed by weak C—H...O hydrogen-bonding interactions, forming layers parallel to the ab plane.

Published
2009
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249. SrPd, a candidate material with extremely large magnetoresistance

Author

Lu, Xiao-Qin, Guo, Peng-Jie, Zhang, Jian-Feng, Liu, Kai, and Lu, Zhong-Yi

Subjects
Condensed Matter - Materials Science
Abstract

The extremely large magnetoresistance (XMR) effect in nonmagnetic semimetals have attracted intensive attention recently. Here we propose an XMR candidate material SrPd based on first-principles electronic structure calculations in combination with a semi-classical model. The calculated carrier densities in SrPd indicate that there is a good electron-hole compensation, while the calculated intrinsic carrier mobilities are as high as 10$^5$ cm$^2$V$^{-1}$s$^{-1}$. There are only two doubly degenerate bands crossing the Fermi level for SrPd, thus a semi-classical two-band model is available for describing its transport properties. Accordingly, the magnetoresistance of SrPd under a magnetic field of $4$ Tesla is predicted to reach ${10^5} \%$ at low temperature. Furthermore, the calculated topological invariant indicates that SrPd is topologically trivial. Our theoretical studies suggest that SrPd can serve as an ideal platform to examine the charge compensation mechanism of the XMR effect., Comment: 6 pages, 5 figures, 2 tables

Published
2021
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250. First-principles study on the electron-phonon coupling and magnetoresistance of LaBi under pressure

Author

Zhang, Jian-Feng, Guo, Peng-Jie, Gao, Miao, Liu, Kai, and Lu, Zhong-Yi

Subjects
Condensed Matter - Superconductivity, Condensed Matter - Materials Science
Abstract

The extremely large magnetoresistance (XMR) material LaBi was reported to become superconducting under pressure accompanying with suppressed magnetoresistance. However, the underlying mechanism is unclear. By using first-principles electronic structure calculations in combination with a semiclassical model, we have studied the electron-phonon coupling and magnetoresistance of LaBi in the pressure range from 0 to 18 GPa. Our calculations show that LaBi undergoes a structural phase transition from a face-centered cubic lattice to a primitive tetragonal lattice at $\sim$7 GPa, verifying previous experimental results. Meanwhile, LaBi remains topologically nontrivial across the structural transition. Under all pressures that we have studied, the phonon-mediated mechanism based on the weak electron-phonon coupling cannot account for the observed superconductivity in LaBi, and the calculated magnetoresistance for LaBi does not show a suppression. The distinct difference between our calculations and experimental observations suggests either the existence of extra Bi impurities in the real LaBi compound or the possibility of other unknown mechanism., Comment: 7 pages, 5 figures, 1 table

Published
2021
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