scholarly journals Spin-transfer torque and electric current in helical edge states in quantum spin Hall devices

2014 ◽  
Vol 90 (20) ◽  
Author(s):  
Qinglei Meng ◽  
Smitha Vishveshwara ◽  
Taylor L. Hughes
Keyword(s):  
Electric Current ◽  
Quantum Spin ◽  
Spin Transfer Torque ◽  
Spin Transfer ◽  
Edge States ◽  
Quantum Spin Hall

scholarly journals Testing topological protection of edge states in hexagonal quantum spin Hall candidate materials

2018 ◽  
Vol 98 (16) ◽  
Author(s):  
Fernando Dominguez ◽  
Benedikt Scharf ◽  
Gang Li ◽  
Jörg Schäfer ◽  
Ralph Claessen ◽  
...  
Keyword(s):  
Quantum Spin ◽  
Edge States ◽  
Quantum Spin Hall

Spin-Wave Dynamics in Antiferromagnets under Electric Current

2021 ◽  
Vol 1 ◽  
Keyword(s):  
Electric Current ◽  
Spin Wave ◽  
Doppler Effect ◽  
Spin Waves ◽  
Microscopic Analysis ◽  
Spin Transfer Torque ◽  
Spin Transfer ◽  
Wave Dynamics

Electric current causes a Doppler effect in spin waves in ferromagnets through a spin-transfer torque. We report that antiferromagnets allow two such spin-transfer torques and present a microscopic analysis that interpolates ferro- and antiferromagnetic transport regimes.

scholarly journals Finite Size Effects on Helical Edge States in a Quantum Spin-Hall System

2008 ◽  
Vol 101 (24) ◽  
Author(s):  
Bin Zhou ◽  
Hai-Zhou Lu ◽  
Rui-Lin Chu ◽  
Shun-Qing Shen ◽  
Qian Niu
Keyword(s):  
Size Effects ◽  
Finite Size ◽  
Quantum Spin ◽  
Edge States ◽  
Finite Size Effects ◽  
Quantum Spin Hall

scholarly journals Nonlinear Ballistic Response of Quantum Spin Hall Edge States

2021 ◽  
Vol 127 (20) ◽  
Author(s):  
Pankaj Bhalla ◽  
Ming-Xun Deng ◽  
Rui-Qiang Wang ◽  
Lan Wang ◽  
Dimitrie Culcer
Keyword(s):  
Quantum Spin ◽  
Edge States ◽  
Quantum Spin Hall

scholarly journals Optimal Thermoelectricity with Quantum Spin Hall Edge States

2019 ◽  
Vol 123 (18) ◽  
Author(s):  
Daniel Gresta ◽  
Mariano Real ◽  
Liliana Arrachea
Keyword(s):  
Quantum Spin ◽  
Edge States ◽  
Quantum Spin Hall

scholarly journals Designing photonic topological insulators with quantum-spin-Hall edge states using topology optimization

Nanophotonics ◽  
2019 ◽  
Vol 8 (8) ◽  
pp. 1363-1369 ◽  
Author(s):  
Rasmus E. Christiansen ◽  
Fengwen Wang ◽  
Ole Sigmund ◽  
Søren Stobbe
Keyword(s):  
Topology Optimization ◽  
Band Gap ◽  
Design Problem ◽  
Topological Insulators ◽  
Quantum Spin ◽  
Edge States ◽  
Unit Cells ◽  
Improved Performance ◽  
Inverse Design Problem ◽  
Quantum Spin Hall

AbstractDesigning photonic topological insulators (PTIs) is highly non-trivial because it requires inversion of band symmetries around the band gap, which was so far done using intuition combined with meticulous trial and error. Here we take a completely different approach: we consider the design of PTIs as an inverse design problem and use topology optimization to maximize the transmission through an edge mode past a sharp bend. Two design domains composed of two different but initially identical C6ν-symmetric unit cells define the geometrical design problem. Remarkably, the optimization results in a PTI reminiscent of the shrink-and-grow approach to quantum-spin-Hall PTIs but with notable differences in the crystal structure as well as qualitatively different band structures and with significantly improved performance as gauged by the band-gap sizes, which are at least 50% larger than in previous designs. Furthermore, we find a directional β-factor exceeding 99% and very low losses for sharp bends. Our approach allows the introduction of fabrication limitations by design and opens an avenue towards designing PTIs with hitherto-unexplored symmetry constraints.

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