scholarly journals Symmetry, nodal structure, and Bogoliubov Fermi surfaces for nonlocal pairing

2021 ◽  
Vol 104 (9) ◽  
Author(s):  
Carsten Timm ◽  
Ankita Bhattacharya
Keyword(s):  
Fermi Surfaces ◽  
Nodal Structure

scholarly journals Effective Hamiltonian for silicene under arbitrary strain from multi-orbital basis

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Zhuo Bin Siu ◽  
Mansoor B. A. Jalil
Keyword(s):  
Tight Binding ◽  
Spin Torque ◽  
Spin Accumulation ◽  
Effective Hamiltonian ◽  
Fermi Surfaces ◽  
Orbital Basis ◽  
Lattice Symmetry ◽  
Out Of Plane ◽  
Coupling Parameters ◽  
Spin Orbit Interactions

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.

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

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.

Nonlinear filter properties of the thick ascending limb

1997 ◽  
Vol 273 (4) ◽  
pp. F625-F634 ◽  
Author(s):  
H. E. Layton ◽  
E. Bruce Pitman ◽  
Leon C. Moore
Keyword(s):  
Steady State ◽  
Frequency Response ◽  
Transit Time ◽  
Concentration Profile ◽  
Tubuloglomerular Feedback ◽  
Thick Ascending Limb ◽  
Transport Parameters ◽  
Nodal Structure ◽  
Nacl Concentration ◽  
Fluid Transit Time

A mathematical model was used to investigate the filter properties of the thick ascending limb (TAL), that is, the response of TAL luminal NaCl concentration to oscillations in tubular fluid flow. For the special case of no transtubular NaCl backleak and for spatially homogeneous transport parameters, the model predicts that NaCl concentration in intratubular fluid at each location along the TAL depends only on the fluid transit time up the TAL to that location. This exact mathematical result has four important consequences: 1) when a sinusoidal component is added to steady-state TAL flow, the NaCl concentration at the macula densa (MD) undergoes oscillations that are bounded by a range interval envelope with magnitude that decreases as a function of oscillatory frequency; 2) the frequency response within the range envelope exhibits nodes at those frequencies where the oscillatory flow has a transit time to the MD that equals the steady-state fluid transit time (this nodal structure arises from the establishment of standing waves in luminal concentration, relative to the steady-state concentration profile, along the length of the TAL); 3) for any dynamically changing but positive TAL flow rate, the luminal TAL NaCl concentration profile along the TAL decreases monotonically as a function of TAL length; and 4) sinusoidal oscillations in TAL flow, except at nodal frequencies, result in nonsinusoidal oscillations in NaCl concentration at the MD. Numerical calculations that include NaCl backleak exhibit solutions with these same four properties. For parameters in the physiological range, the first few nodes in the frequency response curve are separated by antinodes of significant amplitude, and the nodes arise at frequencies well below the frequency of respiration in rat. Therefore, the nodal structure and nonsinusoidal oscillations should be detectable in experiments, and they may influence the dynamic behavior of the tubuloglomerular feedback system.

scholarly journals High-field de Haas–van Alphen studies of the Fermi surfaces ofLaMIn5(M=Co,Rh,Ir)

2009 ◽  
Vol 79 (3) ◽  
Author(s):  
Donavan Hall ◽  
Luis Balicas ◽  
Z. Fisk ◽  
R. G. Goodrich ◽  
U. Alver ◽  
...  
Keyword(s):  
High Field ◽  
Fermi Surfaces

scholarly journals Two-Dimensional Fermi Surfaces in LaRuPO and LaFePO versus Three-Dimensional Fermi Surfaces in LaFe2P2

2009 ◽  
Vol 78 (5) ◽  
pp. 053705 ◽  
Author(s):  
Hiroshi Muranaka ◽  
Yusuke Doi ◽  
Keisuke Katayama ◽  
Hitoshi Sugawara ◽  
Rikio Settai ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Two Dimensional ◽  
Fermi Surfaces

Effect of pressure on the Fermi surfaces of AuGa2, AuAl2, and AuIn2

1970 ◽  
Vol 8 (17) ◽  
pp. 1383-1385 ◽  
Author(s):  
J.E. Schirber ◽  
A.C. Switendick
Keyword(s):  
Fermi Surfaces ◽  
Effect Of Pressure
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