“On the fermi surfaces of random substitutional alloys”

AbstractA tight-binding (TB) Hamiltonian is derived for strained silicene from a multi-orbital basis. The derivation is based on the Slater–Koster coupling parameters between different orbitals across the silicene lattice and takes into account arbitrary distortion of the lattice under strain, as well as the first and second-order spin–orbit interactions (SOI). The breaking of the lattice symmetry reveals additional SOI terms which were previously neglected. As an exemplary application, we apply the linearized low-energy TB Hamiltonian to model the current-induced spin accumulation in strained silicene coupled to an in-plane magnetization. The interplay between symmetry-breaking and the additional SOI terms induces an out-of-plane spin accumulation. This spin accumulation remains unbalanced after summing over the Fermi surfaces of the occupied bands and the two valleys, and can thus be utilized for spin torque switching.

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Single branch of chiral Majorana modes from doubly degenerate Fermi surfaces

Physical Review Research ◽

10.1103/physrevresearch.2.042047 ◽

2020 ◽

Vol 2 (4) ◽

Author(s):

Wang Yang ◽

Chao Xu ◽

Congjun Wu

Keyword(s):

Fermi Surfaces ◽

Majorana Modes ◽

Single Branch

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Spin-texture-driven electrical transport in multi-Q antiferromagnets

Communications Physics ◽

10.1038/s42005-021-00558-8 ◽

2021 ◽

Vol 4 (1) ◽

Author(s):

Soonbeom Seo ◽

Satoru Hayami ◽

Ying Su ◽

Sean M. Thomas ◽

Filip Ronning ◽

...

Keyword(s):

Electrical Transport ◽

Kondo Lattice ◽

Magnetic Interactions ◽

Temperature Phase ◽

Fermi Surfaces ◽

Magnetic Texture ◽

Crystalline Anisotropy ◽

Field Temperature ◽

Kondo Lattice Model ◽

Spin Texture

AbstractUnusual magnetic textures can be stabilized in f-electron materials due to the interplay between competing magnetic interactions, complex Fermi surfaces, and crystalline anisotropy. Here we investigate CeAuSb2, an f-electron incommensurate antiferromagnet hosting both single-Q and double-Q spin textures as a function of magnetic fields (H) applied along the c axis. Experimentally, we map out the field-temperature phase diagram via electrical resistivity and thermal expansion measurements. Supported by calculations of a Kondo lattice model, we attribute the puzzling magnetoresistance enhancement in the double-Q phase to the localization of the electronic wave functions caused by the incommensurate magnetic texture.

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