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pro vyhledávání: '"Cullen, James A."'
The orbital Hall effect (OHE) typically is evaluated using an intuitive approach based on semiclassical considerations. Here we provide a full quantum mechanical evaluation of the orbital current, including all matrix elements of the position operato
Externí odkaz:
http://arxiv.org/abs/2408.05294
The spin-Hall effect underpins some of the most active topics in modern physics, including spin torques and the inverse spin-Hall effect, yet it lacks a proper theoretical description. This makes it difficult to differentiate the SHE from other mecha
Externí odkaz:
http://arxiv.org/abs/2405.04581
Autor:
Cullen, James H., Culcer, Dimitrie
Publikováno v:
Physical Review B, 2024, 108, 245418
The substantial amount of recent research into spin torques has been accompanied by a revival of interest in the spin-Hall effect. This effect contributes to the spin torque in many materials, including topological insulator/ferromagnet devices, Weyl
Externí odkaz:
http://arxiv.org/abs/2309.05723
Publikováno v:
J. Phys.: Condens. Matter 36 315004 (2024)
Topological insulator (TI) surface states exert strong spin-orbit torques. When the magnetization is in the plane its interaction with the TI conduction electrons is non-trivial, and is influenced by extrinsic spin-orbit scattering. This is expected
Externí odkaz:
http://arxiv.org/abs/2306.12557
Publikováno v:
Phys. Rev. B 108, 195434 (2023)
Spin currents are key to spin torque devices, but determining the proper spin current is non-trivial. Here we derive a general quantum-mechanical formula for the intrinsic proper spin current showing that it is topological and can be finite in the ga
Externí odkaz:
http://arxiv.org/abs/2305.14108
Publikováno v:
Nanoscale, 2023,15, 8437-8446
Spin torques at topological insulator (TI)/ferromagnet interfaces have received considerable attention in recent years with a view towards achieving full electrical manipulation of magnetic degrees of freedom. The most important question in this fiel
Externí odkaz:
http://arxiv.org/abs/2206.09939
Autor:
Cullen, James H., Bhalla, Pankaj, Marcellina, Elizabeth, Hamilton, Alexander R., Culcer, Dimitrie
Publikováno v:
Phys. Rev. Lett. 126, 256601 (2021)
The ordinary Hall effect is driven by the Lorentz force, while its anomalous counterpart occurs in ferromagnets. Here we show that the Berry curvature monopole of non-magnetic 2D spin-3/2 holes leads to a novel Hall effect linear in an applied in-pla
Externí odkaz:
http://arxiv.org/abs/2011.09481
Autor:
Wang, Zhanning, Marcellina, Elizabeth, Hamilton, A. R., Cullen, James H., Rogge, Sven, Salfi, Joe, Culcer, Dimitrie
Publikováno v:
npj Quantum Information volume 7, Article number: 54 (2021)
Strong spin-orbit interactions make hole quantum dots central to the quest for electrical spin qubit manipulation enabling fast, low-power, scalable quantum computation. Yet it is important to establish to what extent spin-orbit coupling exposes qubi
Externí odkaz:
http://arxiv.org/abs/1911.11143
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Autor:
Bergstrom Jr., Richard, Wuttig, Manfred, Cullen, James, Zavalij, Peter, Briber, Robert, Dennis, Cindi, Garlea, V. Ovidiu, Laver, Mark
Publikováno v:
Phys. Rev. Lett. 111, 017203 (2013)
The structure and properties of the ferromagnet Tb_{1-x}Dy_xFe_2 (Terfenol-D) are explored through the morphotropic phase boundary (MPB) separating ferroic phases of differing symmetry. Our synchrotron data support a first order structural transition
Externí odkaz:
http://arxiv.org/abs/1311.1037