Publications (29)
Competing spin transfer and dissipation at Co/Cu(001) interfaces on femtosecond timescales
J. Chen, U. Bovensiepen, A. Eschenlohr +5
By combining interface-sensitive non-linear magneto-optical experiments with femtosecond time resolution and ab-initio time-dependent density functional theory, we show that optica…
Element specificity of transient extreme ultra-violet magnetic dichroism
J. K. Dewhurst, F. Willems, P. Elliott +6
In this work we combine theory and experiment to study transient magnetic circular dichroism (tr-MCD) in the extreme ultraviolet spectral range (XUV) in bulk Co and CoPt. We use th…
Ab-initio study of ultrafast spin dynamics in Gdx(FeCo){1-x} alloys
J. K. Dewhurst, Sam Shallcross, I. E. Radu +3
Using an ultrashort laser pulse we explore {\it ab-initio} the spin dynamics of Gd(FeCo) at femtosecond time scales. Optical excitations are found to drive charge from…
Search for associations containing young stars (SACY) VIII. An updated census of spectroscopic binary systems showing hints of non-universal multiplicity among these associations
S. Zúñiga-Fernández, A. Bayo, P. Elliott +10
We seek to update the spectroscopy binary fraction of the SACY (Search for Associations Containing Young stars) sample taking in consideration all possible biases in our identifica…
Laser induced ultrafast demagnetization: an \emph{ab-initio} perspective
K. Krieger, J. K. Dewhurst, P. Elliott +2
Time-dependent density functional theory is implemented in an all electron solid-state code for the case of fully non-collinear spins. We use this to study laser induced demagnetiz…
Absence of Dynamical Steps in the Exact Correlation Potential in Linear Response
K. Luo, P. Elliott, N. T. Maitra
Recent work showed that the exact exchange-correlation potential of time-dependent density functional theory generically displays dynamical step structures. These have a spatially…
Transient spin injection efficiencies at ferromagnet/metal interfaces
P. Elliott, A. Eschenlohr, J. Chen +4
Spin injection across interfaces driven by ultrashort optical pulses on femtosecond timescales constitutes a new way to design spintronics applications. Targeted utilization of thi…
Making a case for femto- phono- magnetism with FePt
S. Sharma, S. Shallcross, P. Elliott +1
In the field of femtomagnetism magnetic matter is controlled by ultrafast laser pulses; here we show that coupling phonon excitations of the nuclei to spin and charge leads to femt…
Herschel-PACS observations of discs in the Eta Chamaeleontis association
P. Riviere-Marichalar, P. Elliott, I. Rebollido +6
Protoplanetary discs are the birthplace for planets. Studying protoplanetary discs is the key to constraining theories of planet formation. By observing dust and gas in association…
Ultrafast demagnetization in bulk vs thin films: an ab-initio study
K. Krieger, P. Elliott, T. Müller +4
We report on {\it ab-initio} simulations of the quantum dynamics of electronic charge and spin when subjected to intense laser pulses. By performing separate calculations for a Ni…
Probing the energy conversion pathways between light, carriers and lattice in real time with attosecond core-level spectroscopy
T. P. H. Sidiropoulos, N. Di Palo, D. E. Rivas +16
Detection of the energy conversion pathways, between photons, charge carriers, and the lattice is of fundamental importance to understand fundamental physics and to advance materia…
Ab-intio study of ultrafast charge dynamics in graphene
Q. Z. Li, P. Elliott, J. K. Dewhurst +2
Monolayer graphene provides an ideal material to explore one of the fundamental light-field driven interference effects: Landau-Zener-Stückelberg interference. However, direct obs…
Search for associations containing young stars (SACY). V. Is multiplicity universal? Tight multiple systems
P. Elliott, A. Bayo, C. H. F. Melo +3
Context: Dynamically undisrupted, young populations of stars are crucial to study the role of multiplicity in relation to star formation. Loose nearby associations provide us with…
On the age of the magnetically active WW Psa and TX Psa members of the beta Pictoris association
S. Messina, R. Santallo, T. G. Tan +6
There are a variety of different techniques available to estimate the ages of pre-main-sequence stars. Components of physical pairs, thanks to their strict coevality and the mass d…
Control of magnons via ultrafast magnetization modulation
N. Singh, P. Elliott, J. K. Dewhurst +1
We demonstrate optical control of magnons using femtosecond laser pulses by performing ab-initio real-time time-dependent density functional theory (TDDFT) simulations. We predict…
Ultrafast Local Magnetization and Demagnetization in Heusler Alloys
P. Elliott, T. Müller, J. K. Dewhurst +2
With the goal of pushing Spintronic devices towards faster and faster timescales, we demonstrate, using ab-intio time-dependent density functional theory simulations of bulk Heusle…
The Giant Spin Hall Effect at Optical Frequencies
P. Elliott, S. Shallcross, Sangeeta Sharma
We generalize the spin Hall angle to laser pulses of finite frequencies in the linear response regime and predict a giant optical spin Hall effect. Namely, for certain transition m…
Demonstration of Optimal Control of Laser Induced Spin-Orbit Mediated Ultrafast Demagnetization
P. Elliott, K. Krieger, J. K. Dewhurst +2
Laser induced ultrafast demagnetization is the process whereby the magnetic moment of a ferromagnetic material is seen to drop significantly on a timescale of s of femtosec…
Search for associations containing young stars (SACY) VII. New stellar and substellar candidate members in the young associations
P. Elliott, A. Bayo, C. H. F. Melo +5
The young associations offer us one of the best opportunities to study the properties of young stellar and substellar objects and to directly image planets thanks to their proximit…
Role of Spin Flips versus Spin Transport in Non Thermal Electrons Excited by Ultrashort Optical Pulses in Transition Metals
V. Shokeen, M. Sanchez Piaia, J. -Y. Bigot +5
A joint theoretical and experimental investigation is performed to understand the underlying physics of laser-induced demagnetization in Ni and Co films. Experimentally dynamics of…
Search for associations containing young stars (SACY). VI. Is multiplicity universal? Stellar multiplicity in the range 3-1000 au from adaptive-optics observations
P. Elliott, N. Huelamo, H. Bouy +7
Context. Young loose nearby associations are unique samples of close (<150 pc), young (approx 5-100 Myr) pre-main sequence (PMS) stars. A significant number of members of these ass…
Valley control by linearly polarized laser pulses
S. Sharma, P. Elliott, S. Shallcross
Underpinning the field of "valleytronics" is the coupling of the helicity of circularly polarized light to the valley degree of freedom, and this remains the only known lightform t…
The crucial role of higher-order multiplicity in wide binary formation: A case study using the -Pictoris moving group
P. Elliott, A. Bayo
The "in-situ" formation of very wide binaries is hard to explain as their physical separations are beyond the typical size of a collapsing cloud core (5000-10,000 au). Her…
Numerical analysis of XMCD sum rules at the -edge: when do they fail?
S. Shallcross, J. K. Dewhurst, P. Elliott +3
In the highly non-equilibrium conditions of laser induced spin dynamics magnetic moments can only be obtained from the spectral information, most commonly from the spectroscopy of…
Electronic origin of x-ray absorption peak shifts
S. Shallcross, C. v. Korff Schmising, P. Elliott +3
Encoded in the transient x-ray absorption (XAS) and magnetic circular (MCD) response functions resides a wealth of information of the microscopic processes of ultrafast demagnetisa…
A deep staring campaign in the Sigma Orionis cluster. Variability in substellar members
P. Elliott, A. Scholz, R. Jayawardhana +2
Deep optical imaging is used to study time-domain properties of young brown dwarfs in sigma Orionis over typical rotational time-scales and to search for new substellar and planeta…
The generalized gradient approximation kernel in time-dependent density functional theory
N. Singh, P. Elliott, T. Nautiyal +2
A complete understanding of a material requires both knowledge of the excited states as well as of the ground state. In particular, the low energy excitations are of utmost importa…
Ultrafast optical control over spin and momentum in solids
Q. Z. Li, S. Shallcross, J. K. Dewhurst +2
The coupling of laser light to matter can exert sub-cycle coherent control over material properties, with optically induced currents and magnetism shown to be controllable on ultra…
Where does the spin angular momentum go in laser induced demagnetisation?
J. K. Dewhurst, S. Shallcross, P. Elliott +3
The dynamics of ultrafast demagnetisation in 3 magnets is complicated by the presence of both spin and orbital angular momentum, with the microscopic mechanism…