81 citations · 193 across the 27 of their papers we have counts for
27 papers
Topological phase transition in disordered elastic quantum spin Hall system
Xiaotian Shi, Rajesh Chaunsali, Georgios Theocharis +3
We investigate the effect of disorder on topologically nontrivial states in a two dimension (2D) mechanical system. We first propose a quantum spin Hall (QSH) insulator based on an…
Klein tunneling of the electronic states in the gate voltage modulated skyrmion crystal
Jianhua Gong, Rui Zhu
As a result of the Hund's coupling, the band structure of the conducting electrons in the skyrmion crystal (SkX) shares similar topological properties with that of graphene, such a…
Topological phase transitions driven by polarity change and next-nearest-neighbor hopping in skyrmion crystals
Jianhua Gong, Rui Zhu
By considering the bulk-edge correspondence of the skyrmion crystal this work focused on the relation of the topological properties to the polarity (), next-nearest-ne…
Slow propagation of 2 GHz acoustical waves in a suspended GaAs on insulator phononic waveguide
Giuseppe Modica, Rui Zhu, Robert Horvath +3
Optoelectronic oscillators have dominated the scene of microwave oscillators in the last few years thanks to their great performances regarding frequency stability and phase noise.…
Unconventional topological Hall effect in high-topological-number skyrmion crystals
Rui Zhu, Weinan Liu
Skyrmions with the topological number equal an integer larger than 1 are called high-topological-number skyrmions or high- skyrmions. In this work, we theoretically study th…
Optomechanical Gigahertz Oscillator made of a Two Photon Absorption free piezoelectric III/V semiconductor
Inès Ghorbel, François Swiadek, Rui Zhu +8
Oscillators in the GHz frequency range are key building blocks for telecommunication, timing and positioning applications. Operating directly in the GHz and compactness while keepi…
Quantum pumping with adiabatically modulated barriers in three-band pseudospin-1 Dirac-Weyl systems
Xiaomei Chen, Rui Zhu
In this work, pumped currents of the adiabatically-driven double-barrier structure based on the pseudospin-1 Dirac-Weyl fermions are studied. As a result of the three-band dispersi…
Fano resonance via bonding and antibonding states in nonadiabatically-pumped double-quantum-well systems
Cong Cai, Rui Zhu
In this work, transport properties of the nonadiabatically pumped double-quantum-well (DQW) structure are studied. Different from a single quantum well, band mixing in the DQW gene…
Tailoring the topological details of the magnetic skyrmion by the spin configuration at the edges
Yin-Yan Zhang, Rui Zhu
The magnetic skyrmion structure can be formed in the chiral magnets (CMs) with strong Dzyaloshinskii-Moriya interactions. In this work, we propose a way of artificially tailoring t…
Skyrmion dynamics in a chiral magnet driven by periodically varying spin currents
Rui Zhu, Yin-Yan Zhang
In this work, we investigated the spin dynamics in a slab of chiral magnets induced by an alternating (ac) spin current. Periodic trajectories of the skyrmion in real space are dis…
Resonance in the nonadiabatic quantum pumping of the time-dependent Josephson junction
Rui Zhu, Mi Liu
In this work, we investigated the nonadiabatic transport properties of the one-dimensional time-dependent superconductor-normal metal-superconductor (SNS) Josephson junction biased…
Shot noise of the conductance through a superconducting barrier in graphene
Mi Liu, Rui Zhu
We investigated the conductance and shot noise properties of quasiparticle-transport through a superconducting barrier in graphene. Based on the Blonder, Tinkham, and Klapwijk (BTK…
Fano Resonance in the Nonadiabatically Pumped Shot Noise of a Time-Dependent Quantum Well in 2DEG and Graphene
Rui Zhu, Jiao-Hua Dai, Yong Guo
Interference between different quantum paths can generate Fano resonance. One of the examples is transport through a quasibound state driven by time-dependent scattering potential.…
Conductance and shot noise in the helimagnet tunnel junction
Rui Zhu, Guo-Yi Zhu
As a result of sinusoidal spatial modulation, helimagnet induces spin-dependent diffracted transmission. In this work, we propose a general scattering matrix treatment to the trans…
Fano resonance in the nonadiabatic pumped shot noise of a time-dependent potential well
Jiao-Hua Dai, Rui Zhu
We use the Floquet scattering theory to study the correlation properties of the nonadiabatic pumped dc current and heat flow through a time-dependent potential well. Oscillator ind…
Diffraction induced Spin Pumping in Normal-Metal/Multiferroic-Helimagnet/Ferromagnet Heterostructures
Rui Zhu
Generally the adiabatic quantum pumping phenomenon can be interpreted by the surface integral of the Berry curvature inside the cyclic loop. Spin angular momentum flow without char…
Anharmonic Effect of Adiabatic Quantum Pumping
Wei-Yin Deng, Ke-Ju Zhong, Rui Zhu +1
Based on the scattering matrix approach, we systematically investigate the anharmonic effect of the pumped current in double-barrier structures with adiabatic time-modulation of tw…
Resonant tunneling through double-barrier structures on graphene
Wei-Yin Deng, Rui Zhu, Yun-Chang Xiao +1
Quantum resonant tunneling behaviors of double-barrier structures on graphene are investigated under the tight-binding approximation. The Klein tunneling and resonant tunneling are…
Conductance in the Helimagnet- and Skyrmion-Lattice-Embedded Electron Waveguide
Rui Zhu
The helimagnet (HM) and skyrmion lattice (SL) are topologically nontrivial magnetic states. Their spin texture gives rise to finite topological magnetic field and Lorentz force. As…
Quantum pumping in helimagnet heterostructures
Rui Zhu, Li-Juan Cui
Spin-dependent diffraction occurs in helimagnet-related transport processes. In this work, we investigated quantum pumping properties in the normal-metal/helimagnet/normal-metal he…
Spin-dependent Fano resonance induced by conducting chiral helimagnet contained in a quasi-one-dimensional electron waveguide
Rui Zhu
Fano resonance appears for conduction through an electron waveguide containing donor impurities. In this work, we consider the thin-film conducting chiral helimagnet (CCH) as the d…
Spin-dependent electron grating effect from helical magnetization in multiferroic tunnel junctions
Rui Zhu
In multiferroic oxides with a transverse helical magnetic order, the magnetization exchange coupling is sinusoidally space-dependent. We theoretically investigate the spin-dependen…
Pumped shot noise in adiabatically modulated graphene-based double-barrier structures
Rui Zhu, Maoli Lai
Quantum pumping processes are accompanied by considerable quantum noise. We investigated the pumped shot noise (PSN) properties in adiabatically modulated graphene-based double-bar…
Development in the Scattering Matrix Theory: From Spin-Orbit-Coupling Affected Shot Noise to Quantum Pumping
Rui Zhu
The review chapter starts by a pedagogical introduction to the general concept of the scattering theory: from the fundamental wave-function picture to the second-quantization langu…