58 citations · 111 across the 10 of their papers we have counts for
10 papers
Relativistic and nonrelativistic spin splitting above and below the Fermi level in a -wave altermagnet
Nicholas Dale, Omar A. Ashour, Marc Vila +8
Nonrelativistic spin splitting (NRSS) challenges conventional wisdom about antiferromagnets by allowing spin-split electronic bands even in collinear orders with zero net magnetiza…
Pressure-Tunable Targets for Light Dark Matter Direct Detection: The Case of Solid Helium
Omar A. Ashour, Sinéad M. Griffin
We propose hydrostatic pressure -- a well-established tool for tuning properties of condensed matter -- as a novel route for optimizing targets for light dark matter direct detecti…
On the effects of strain, defects, and interactions on the topological properties of HfTe5
Na Hyun Jo, Omar A. Ashour, Zhixue Shu +7
Topological insulators are characterized by spin-momentum-locked massless surface states which are robust under various perturbations. Manipulating such surface states is a topic o…
Theoretical investigation of decoherence channels in athermal phonon sensors
Thomas F. Harrelson, Ibrahim Hajar, Omar A. Ashour +1
The creation and evolution of nonequilibrium phonons is central in applications ranging from cosmological particle searches to decoherence processes in qubits. However, the fundame…
NonlinearSchrodinger: Higher-Order Algorithms and Darboux Transformations for Nonlinear Schrödinger Equations
Omar A. Ashour
NonlinearSchrodinger.jl is a Julia package with a simple interface for studying solutions of nonlinear Schrödinger equations (NLSEs). In approximately ten lines of code, one can pe…
Higher-order Breathers as Quasi-rogue Waves on a Periodic Background
Omar A. Ashour, Siu A. Chin, Stanko N. Nikolić +1
We investigate higher-order breathers of the cubic nonlinear Schrödinger equation on an elliptic background. We find that, beyond first-order, any arbitrarily constructed breather…
Femtosecond laser induced structural dynamics and melting of Cu (111) single crystal. An ultrafast time-resolved x-ray diffraction study
Runze Li, Omar A. Ashour, Jie Chen +2
Femtosecond, 8.04 KeV x-ray pulses are used to probe the lattice dynamics of 150 nm Cu (111) single crystal on mica substrate irradiated with 400 nm, 100 fs laser pulses. For pump…
Peak-height formula for higher-order breathers of the nonlinear Schrödinger equation on non-uniform backgrounds
Siu A. Chin, Omar A. Ashour, Stanko N. Nikolić +1
Given any background (or seed) solution of the nonlinear Schrödinger equation, the Darboux transformation can be used to generate higher-order breathers with much greater peak inte…
Maximal intensity higher-order Akhmediev breathers of the nonlinear Schrodinger equation and their systematic generation
Siu A. Chin, Omar A. Ashour, Stanko N. Nikolic +1
It is well known that Akhmediev breathers of the nonlinear cubic Schrodinger equation can be superposed nonlinearly via the Darboux transformation to yield breathers of higher orde…
Anatomy of the Akhmediev breather: cascading instability, first formation time and Fermi-Pasta-Ulam recurrence
Siu A. Chin, Omar A. Ashour, Milivoj R. Belic
By invoking Bogoliubov's spectrum, we show that for the nonlinear Schrodinger equation, the modulation instability (MI) of its n = 1 Fourier mode on a finite background automatica…