102 citations · 280 across the 21 of their papers we have counts for
21 papers
Beyond Local Berry Geometry: A First-Principles Finite-Momentum Theory of Electronic Position
M. S. Si, Y. Q. Li, G. P. Zhang
Electronic position controls how a crystal polarizes and responds to an external field. In crystals, it is usually described through local changes of electronic states in momentum…
A simple model for longitudinal electron transport during and after laser excitation: Emergence of electron resistive transport
Robert Meadows, Y. Xue, Nicholas Allbritton +1
Laser-driven electron transport across a sample has garnered enormous attentions over several decades, as it provides a much faster way to control electron dynamics. Light is an el…
Gateway to all-optical spin switching in Heusler ferrimagnets: Pancharatnam-Berry tensor and magnetic moment ratio
G. P. Zhang, Y. Q. Liu, M. S. Si +4
All-optical spin switching (AOS) is a new phenomenon found in a small group of magnetic media, where a single laser pulse can switch spins from one direction to another, without as…
Nonlinear harmonic spectra in bilayer van der Waals antiferromagnets CrX
Y. Q. Liu, M. S. Si, G. P. Zhang
Bilayer antiferromagnets CrX (X Cl, Br, and I) are promising materials for spintronics and optoelectronics that are rooted in their peculiar electronic structures. Howeve…
Electron transport under an ultrafast laser pulse: Implication for spin transport
Robert Meadows, Y. Xue, Nicholas Allbritton +1
Laser-driven electron transport across a sample has garnered enormous attentions over several decades, because it potentially allows one to control spin transports in spintronics.…
Strong and nearly 100 spin-polarized second-harmonic generation from ferrimagnet MnRuGa
Y. Q. Liu, M. S. Si, G. P. Zhang
Second-harmonic generation (SHG) has emerged as a promising tool for detecting electronic and magnetic structures in noncentrosymmetric materials, but 100 spin-polarized SHG ha…
First-principles insights into all-optical spin switching in the half-metallic Heusler ferrimagnet MnRuGa
G. P. Zhang, Y. H. Bai, M. S. Si +1
All-optical spin switching (AOS) represents a new frontier in magnetic storage technology -- spin manipulation without a magnetic field, -- but its underlying working principle is…
Optically- and thermally-driven huge lattice orbital and spin angular momenta from spinning fullerenes
G. P. Zhang, Y. H. Bai, Thomas F. George
Lattice vibration in solids may carry angular momentum. But unlike the intrinsic spin of electrons, the lattice vibration is rarely rotational. To induce angular momentum, one need…
Correlation Between Spin and Orbital Dynamics During Laser-Induced Femtosecond Demagnetization
G. P. Zhang, Mingqiang Gu, Y. H. Bai +2
Spin and orbital angular momenta are two intrinsic properties of an electron and are responsible for the physics of a solid. How the spin and orbital evolve with respect to each ot…
Parton Interpretation and Twist-4 Parton Distributions
J. P. Ma, Z. Y. Pang, G. P. Zhang
Through explicit examples we show that twist-4 parton distributions have no parton interpretation in the sense that parton or partons inside a hadron can carry the momentum fractio…
On the Singular Behavior of the Chirality-Odd Twist-3 Parton Distribution e(x)
J. P. Ma, G. P. Zhang
The first moment the chirality-odd twist-3 parton distribution is related to the pion-nucleon -term which is important for phenomenology. However, the possible existence…
Ultrafast reduction in exchange interaction by a laser pulse: Alternative path to femtomagnetism
G. P. Zhang, Mingqiang Gu, X. S. Wu
Since the beginning of femtomagnetism, it has been hotly debated how an ultrafast laser pulse can demagnetize a sample and switch its spins within a few hundred femtoseconds, but n…
Double exchange model on triangular lattice: non-coplanar spin configuration and phase transition near quarter filling
G. P. Zhang, Jian Zhang, Qi-Li Zhang +2
Unconventional anomalous Hall effect in frustrated pyrochlore oxides is originated from spin chirality of non-coplanar localized spins, which can also be induced by the competition…
Effect of disorder with long-range correlation on transport in graphene nanoribbon
G. P. Zhang, M. Gao, Y. Y. Zhang +3
Transport in disordered armchair graphene nanoribbons (AGR) with long-range correlation between quantum wire contact is investigated by transfer matrix combined with Landauer's for…
Electronic and spin transport properties of zigzag graphene nanoribbon mediated by metal adatom: A study by QUAMBO-NEGF approach
G. P. Zhang, Xiaojie Liu, C. Z. Wang +3
Structural and electronic properties, including deformation, magnetic moment, Mulliken population, bond order as well as electronic transport properties, of zigzag graphene nanorib…
Resolving photon-shortage mystery in femtosecond magnetism
M. S. Si, G. P. Zhang
For nearly a decade, it has been a mystery why the small average number of photons absorbed per atom from an ultrashort laser pulse is able to induce a strong magnetization within…
Orbital-resolved Soft X-Ray Spectroscopy in NaV2O5
G. P. Zhang, G. T. Woods, Eric L. Shirley +6
We demonstrate that angle-resolved soft x-ray spectroscopy can resolve absorption by inequivalent oxygen sites and by different orbitals belonging to the same site in NaV2O5. By ro…
Electron Correlation Effects in Resonant Inelastic X-ray Scattering of NaV2O5
G. P. Zhang, T. A. Callcott, G. T. Woods +4
Element- and site-specific resonant inelastic x-ray scattering spectroscopy (RIXS) is employed to investigate electron correlation effects in {}. In contrast to singl…
Soft x-ray spectroscopy measurements of the p-like density of states of B in MgB2 and evidence for surface boron oxides on exposed surfaces
T. A. Callcott, L. Lin, G. T. Woods +4
Soft X-ray absorption and fluorescence measurements are reported for the K-edge of B in MgB2. The measurements confirm a high density of B pxy(sigma)-states at the Fermi edge and e…
Femtosecond electron and spin dynamics probed by nonlinear optics
G. P. Zhang, W. Hübner
A theoretical calculation is performed for the ultrafast spin dynamics in nickel using an exact diagonalization method. The present theory mainly focuses on a situation where the i…
Ultrafast Spin Dynamics in Nickel
W. Hubner, G. P. Zhang
The spin dynamics in Ni is studied by an exact diagonalization method on the ultrafast time scale. It is shown that the femtosecond relaxation of the magneto-optical response resul…