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Title: Symmetry rules shaping spin-orbital textures in surface states

Authors:
; ; ; ; ; ; ; ;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1372533
Grant/Contract Number:
AC02-05CH11231
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 95; Journal Issue: 24; Related Information: CHORUS Timestamp: 2017-06-30 22:09:55; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English

Citation Formats

Gotlieb, Kenneth, Li, Zhenglu, Lin, Chiu-Yun, Jozwiak, Chris, Ryoo, Ji Hoon, Park, Cheol-Hwan, Hussain, Zahid, Louie, Steven G., and Lanzara, Alessandra. Symmetry rules shaping spin-orbital textures in surface states. United States: N. p., 2017. Web. doi:10.1103/PhysRevB.95.245142.
Gotlieb, Kenneth, Li, Zhenglu, Lin, Chiu-Yun, Jozwiak, Chris, Ryoo, Ji Hoon, Park, Cheol-Hwan, Hussain, Zahid, Louie, Steven G., & Lanzara, Alessandra. Symmetry rules shaping spin-orbital textures in surface states. United States. doi:10.1103/PhysRevB.95.245142.
Gotlieb, Kenneth, Li, Zhenglu, Lin, Chiu-Yun, Jozwiak, Chris, Ryoo, Ji Hoon, Park, Cheol-Hwan, Hussain, Zahid, Louie, Steven G., and Lanzara, Alessandra. Fri . "Symmetry rules shaping spin-orbital textures in surface states". United States. doi:10.1103/PhysRevB.95.245142.
@article{osti_1372533,
title = {Symmetry rules shaping spin-orbital textures in surface states},
author = {Gotlieb, Kenneth and Li, Zhenglu and Lin, Chiu-Yun and Jozwiak, Chris and Ryoo, Ji Hoon and Park, Cheol-Hwan and Hussain, Zahid and Louie, Steven G. and Lanzara, Alessandra},
abstractNote = {},
doi = {10.1103/PhysRevB.95.245142},
journal = {Physical Review B},
number = 24,
volume = 95,
place = {United States},
year = {Fri Jun 30 00:00:00 EDT 2017},
month = {Fri Jun 30 00:00:00 EDT 2017}
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on June 30, 2018
Publisher's Accepted Manuscript

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  • We study periodic crystalline spin textures in spinor condensates with dipolar interactions via a systematic symmetry analysis of the low-energy effective theory. By considering symmetry operations which combine real- and spin-space operations, we classify symmetry groups consistent with nontrivial experimental and theoretical constraints. Minimizing the energy within each symmetry class allows us to explore possible ground states.
  • Topological magnetic states, such as chiral skyrmions, are of great scientific interest and show huge potential for novel spintronics applications, provided their topological charges can be fully controlled. So far skyrmionic textures have been observed in noncentrosymmetric crystalline materials with low symmetry and at low temperatures. We propose theoretically and demonstrate experimentally the design of spin textures with topological charge densities that can be tailored at ambient temperatures. Tuning the interlayer coupling in vertically stacked nanopatterned magnetic heterostructures, such as a model system of a Co/Pd multilayer coupled to Permalloy, the in-plane non-collinear spin texture of one layer can bemore » imprinted into the out-of-plane magnetised material. We observe distinct spin textures, e.g. vortices, magnetic swirls with tunable opening angle, donut states and skyrmion core configurations. We show that applying a small magnetic field, a reliable switching between topologically distinct textures can be achieved at remanence« less
  • This paper deals with the construction of baryon wave functions in the even-wave harmonic-oscillator (h.o.) model described in a previous paper. This model gives rise to an apparent doubling of (70, 1/sup -/) states and a further splitting of 70 states with higher angular momenta. The split states up to L = 2 are constructed in terms of a new set of variables (x/sub i/, y/sub i/, lambda) which are found to be particularly convenient for the description of the orbital symmetries of the 70 states. Evaluation of the orbital matrix elements based on these wave functions leads to amore » set of orbital selection rules forbidding transitions between the upper (u) and lower (l) states of (70, 1/sup -/) and similar selection rules for higher states. For the description of the physical processes in this model, the nucleon octet is assumed to be an ideally mixed state of (56, 0/sup +/) and the newly available (70, 0/sup +/) ground state which has no ready counterpart in the full-wave h.o. model. Such a mixed nucleon octet is shown to reconcile at once the G/sub A//G/sub V/ ratio as well as the ..delta.. ..-->.. N..pi.. width with the NN..pi.. coupling constant.« less
  • Nematicity, defined as broken rotational symmetry, has recently been observed in competing phases proximate to the superconducting phase in the cuprate high temperature superconductors. Similarly, the new iron-based high temperature superconductors exhibit a tetragonal to orthorhombic structural transition (i.e. a broken C{sub 4} symmetry) that either precedes or is coincident with a collinear spin density wave (SDW) transition in undoped parent compounds, and superconductivity arises when both transitions are suppressed via doping. Evidence for strong in-plane anisotropy in the SDW state in this family of compounds has been reported by neutron scattering, scanning tunneling microscopy, and transport measurements. Here wemore » present an angle resolved photoemission spectroscopy study of detwinned single crystals of a representative family of electron-doped iron-arsenide superconductors, Ba(Fe{sub 1-x}Co{sub x}){sub 2}As{sub 2} in the underdoped region. The crystals were detwinned via application of in-plane uniaxial stress, enabling measurements of single domain electronic structure in the orthorhombic state. At low temperatures, our results clearly demonstrate an in-plane electronic anisotropy characterized by a large energy splitting of two orthogonal bands with dominant d{sub xz} and d{sub yz} character, which is consistent with anisotropy observed by other probes. For compositions x > 0, for which the structural transition (T{sub S}) precedes the magnetic transition (T{sub SDW}), an anisotropic splitting is observed to develop above T{sub SDW}, indicating that it is specifically associated with T{sub S}. For unstressed crystals, the band splitting is observed close to T{sub S}, whereas for stressed crystals the splitting is observed to considerably higher temperatures, revealing the presence of a surprisingly large in-plane nematic susceptibility in the electronic structure.« less