218 citations · 2.3k across the 38 of their papers we have counts for
35 papers · 1 filter
Giant Spin Transport Anisotropy in Magnetic Topological Insulators
Marc Vila, Aron W. Cummings, Stephan Roche
We report on exceptionally long spin transport and giant spin lifetime anisotropy in the gapped surface states of three-dimensional (3D) magnetic topological insulators (MTIs). We…
Resilient Intraparticle Entanglement and its Manifestation in Spin Dynamics of Disordered Dirac Materials
Jorge Martinez Romeral, Aron W. Cummings, Stephan Roche
Topological quantum matter exhibits novel transport phenomena driven by entanglement between internal degrees of freedom, as for instance generated by spin-orbit coupling effects.…
Tailoring giant quantum transport anisotropy in disordered nanoporous graphenes
Isaac Alcón, Aron Cummings, Stephan Roche
During the last 15 years bottom-up on-surface synthesis has been demonstrated as an efficient way to synthesize carbon nanostructures with atomic precision, opening the door to unp…
All-carbon approach to inducing electrical and optical anisotropy in graphene
Aleandro Antidormi, Aron W. Cummings
Owing to its array of unique properties, graphene is a promising material for a wide variety of applications. Being two-dimensional, the properties of graphene are also easily tune…
Optimizing the photothermoelectric effect in graphene
Aleandro Antidormi, Aron W. Cummings
Among its many uses, graphene shows significant promise for optical and optoelectronic applications. In particular, devices based on the photothermoelectric effect (PTE) in graphen…
Graphene on two-dimensional hexagonal BN, AlN, and GaN: Electronic, spin-orbit, and spin relaxation properties
Klaus Zollner, Aron W. Cummings, Stephan Roche +1
We investigate the electronic structure of graphene on a series of 2D hexagonal nitride insulators hXN, X = B, Al, and Ga, with DFT calculations. A symmetry-based model Hamiltonian…
Observation of giant and tuneable thermal diffusivity of Dirac fluid at room temperature
Alexander Block, Alessandro Principi, Niels C. H. Hesp +8
Conducting materials typically exhibit either diffusive or ballistic charge transport. However, when electron-electron interactions dominate, a hydrodynamic regime with viscous cha…
Nonlocal Spin Dynamics in the Crossover from Diffusive to Ballistic Transport
Marc Vila, Jose H. Garcia, Aron W. Cummings +4
Improved fabrication techniques have enabled the possibility of ballistic transport and unprecedented spin manipulation in ultraclean graphene devices. Spin transport in graphene i…
Magnetic proximity in a van der Waals heterostructure of magnetic insulator and graphene
Bogdan Karpiak, Aron W. Cummings, Klaus Zollner +8
Engineering two-dimensional material heterostructures by combining the best of different materials in one ultimate unit can offer a plethora of opportunities in condensed matter ph…
Universal spin diffusion length in polycrystalline graphene
Aron W. Cummings, Simon M. -M. Dubois, Jean-Christophe Charlier +1
Graphene grown by chemical vapor deposition (CVD) is the most promising material for industrial-scale applications based on graphene monolayers. It also holds promise for spintroni…
Probing magnetism via spin dynamics in graphene/2D-ferromagnet heterostructures
Aron W. Cummings
The recent discovery of two-dimensional magnetic insulators has generated a great deal of excitement over their potential for nanoscale manipulation of spin or magnetism. One intri…
Linear Scaling Quantum Transport Methodologies
Zheyong Fan, Jose Hugo Garcia, Aron W. Cummings +5
In recent years, predictive computational modeling has become a cornerstone for the study of fundamental electronic, optical, and thermal properties in complex forms of condensed m…
Spin Proximity Effects in Graphene/Topological Insulator Heterostructures
Kenan Song, David Soriano, Aron W. Cummings +3
Enhancing the spin-orbit interaction in graphene, via proximity effects with topological insulators, could create a novel 2D system that combines nontrivial spin textures with high…
Electrical and thermal transport in coplanar polycrystalline graphene-hBN heterostructures
J. E. Barrios Vargas, B. Mortazavi, A. W. Cummings +5
We present a theoretical study of electronic and thermal transport in polycrystalline heterostructures combining graphene (G) and hexagonal boron nitride (hBN) grains of varying si…
Spin transport in graphene/transition metal dichalcogenide heterostructures
Jose H. Garcia, Marc Vila, Aron W. Cummings +1
Since its discovery, graphene has been a promising material for spintronics: its low spin-orbit coupling, negligible hyperfine interaction, and high electron mobility are obvious a…
One-dimensional ferromagnetic edge contacts to two-dimensional graphene/h-BN heterostructures
Bogdan Karpiak, André Dankert, Aron W. Cummings +3
We report the fabrication of one-dimensional (1D) ferromagnetic edge contacts to two-dimensional (2D) graphene/h-BN heterostructures. While aiming to study spin injection/detection…
Grain boundary-induced variability of charge transport in hydrogenated polycrystalline graphene
Jose E. Barrios Vargas, Jesper T. Falkenberg, David Soriano +3
Chemical functionalization has proven to be a promising means of tailoring the unique properties of graphene. For example, hydrogenation can yield a variety of interesting effects,…
Large spin relaxation anisotropy and valley-Zeeman spin-orbit coupling in WSe2/Gr/hBN heterostructures
Simon Zihlmann, Aron W. Cummings, Jose H. Garcia +5
Large spin-orbital proximity effects have been predicted in graphene interfaced with a transition metal dichalcogenide layer. Whereas clear evidence for an enhanced spin-orbit coup…
Spin Hall effect and Weak Antilocalization in Graphene/Transition Metal Dichalcogenide Heterostructures
Jose H. Garcia, Aron W. Cummings, Stephan Roche
We report on a theoretical study of the spin Hall Effect (SHE) and weak antilocal-ization (WAL) in graphene/transition metal dichalcogenide (TMDC) heterostructures, computed throug…
Giant Spin Lifetime Anisotropy in Graphene Induced by Proximity Effects
Aron W. Cummings, Jose H. García, Jaroslav Fabian +1
We report on fundamental aspects of spin dynamics in graphene interfaced with transition metal dichalcogenides (TMDCs). By using realistic models derived from first principles we c…
Localized electronic states at grain boundaries on the surface of graphene and graphite
Adina Luican-Mayer, Jose E. Barrios-Vargas, Jesper Toft Falkenberg +8
Recent advances in large-scale synthesis of graphene and other 2D materials have underscored the importance of local defects such as dislocations and grain boundaries (GBs), and es…
Effects of Dephasing on Spin Lifetime in Ballistic Spin-Orbit Materials
Aron W. Cummings, S. Roche
We theoretically investigate spin dynamics in spin-orbit-coupled materials. In the ballistic limit, the spin lifetime is dictated by dephasing that arises from energy broadening pl…
Spin Dynamics and Relaxation in Graphene Dictated by Electron-hole Puddles
Dinh Van Tuan, Frank Ortmann, Aron W. Cummings +2
The understanding of spin dynamics and relaxation mechanisms in clean graphene and the upper time and length scales on which spin devices can operate are prerequisites to realizing…
Near-field photocurrent nanoscopy on bare and encapsulated graphene
Achim Woessner, Pablo Alonso-González, Mark B. Lundeberg +14
Opto-electronic devices utilizing graphene have already demonstrated unique capabilities, which are much more difficult to realize with conventional technologies. However, the requ…