Topological Pumping of Spin-Polarized Currents through Helical Edge States Due to Dynamically Generated Mass Gap

2013 ◽  
Vol 82 (2) ◽  
pp. 024708 ◽  
Author(s):  
Kiminori Hattori
Keyword(s):  
Edge States ◽  
Mass Gap ◽  
Spin Polarized

Non-Dirac Chern insulators with large band gaps and spin-polarized edge states

Nanoscale ◽  
2018 ◽  
Vol 10 (18) ◽  
pp. 8569-8577 ◽  
Author(s):  
Y. Xue ◽  
J. Y. Zhang ◽  
B. Zhao ◽  
X. Y. Wei ◽  
Z. Q. Yang
Keyword(s):  
Band Gap ◽  
Band Gaps ◽  
Edge States ◽  
Half Metallic ◽  
Spin Polarized ◽  
Chern Insulators

A non-Dirac Chern insulator with a large band gap (244 meV) and half-metallic edge states was realized in a PbC/MnSe heterostructure.

scholarly journals Quantum parity Hall effect in Bernal-stacked trilayer graphene

2019 ◽  
Vol 116 (21) ◽  
pp. 10286-10290 ◽  
Author(s):  
Petr Stepanov ◽  
Yafis Barlas ◽  
Shi Che ◽  
Kevin Myhro ◽  
Greyson Voigt ◽  
...  
Keyword(s):  
Hall Effect ◽  
Quantum Hall Effect ◽  
Quantum Hall ◽  
Exchange Interactions ◽  
Mirror Reflection ◽  
Edge States ◽  
State Variables ◽  
Coulomb Interactions ◽  
Spin Polarized ◽  
Trilayer Graphene

The quantum Hall effect has recently been generalized from transport of conserved charges to include transport of other approximately conserved-state variables, including spin and valley, via spin- or valley-polarized boundary states with different chiralities. Here, we report a class of quantum Hall effect in Bernal- or ABA-stacked trilayer graphene (TLG), the quantum parity Hall (QPH) effect, in which boundary channels are distinguished by even or odd parity under the system’s mirror reflection symmetry. At the charge neutrality point, the longitudinal conductance σxx is first quantized to 4e2/h at a small perpendicular magnetic field B⊥, establishing the presence of four edge channels. As B⊥ increases, σxx first decreases to 2e2/h, indicating spin-polarized counterpropagating edge states, and then, to approximately zero. These behaviors arise from level crossings between even- and odd-parity bulk Landau levels driven by exchange interactions with the underlying Fermi sea, which favor an ordinary insulator ground state in the strong B⊥ limit and a spin-polarized state at intermediate fields. The transitions between spin-polarized and -unpolarized states can be tuned by varying Zeeman energy. Our findings demonstrate a topological phase that is protected by a gate-controllable symmetry and sensitive to Coulomb interactions.

scholarly journals Selective Equilibration of Spin-Polarized Quantum Hall Edge States in Graphene

2014 ◽  
Vol 112 (19) ◽  
Author(s):  
F. Amet ◽  
J. R. Williams ◽  
K. Watanabe ◽  
T. Taniguchi ◽  
D. Goldhaber-Gordon
Keyword(s):  
Quantum Hall ◽  
Edge States ◽  
Spin Polarized

Spin-polarized edge states of quantum Hall systems on silicon basis

2006 ◽  
Vol 83 (4-9) ◽  
pp. 1753-1756 ◽  
Author(s):  
Carsten Kentsch ◽  
Wolfgang Henschel ◽  
David Wharam ◽  
Dieter P. Kern
Keyword(s):  
Quantum Hall ◽  
Edge States ◽  
Quantum Hall Systems ◽  
Spin Polarized

TUNNELING BETWEEN SPIN POLARIZED EDGE STATES STUDIED AT HIGH MAGNETIC FIELDS

2005 ◽  
Author(s):  
G. SUKHODUB ◽  
F. HOHLS ◽  
R. J. HAUG ◽  
D. K. MAUDE ◽  
D. REUTER ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
High Magnetic Fields ◽  
Edge States ◽  
Spin Polarized

The spin-polarized edge states of blue phosphorene nanoribbons induced by electric field and electron doping

2020 ◽  
Vol 33 (10) ◽  
pp. 105302
Author(s):  
Shidong Zhang ◽  
Yun Li ◽  
Yun-Peng Wang ◽  
Jialin Li ◽  
Mingjun Li ◽  
...  
Keyword(s):  
Electric Field ◽  
Edge States ◽  
Electron Doping ◽  
Spin Polarized ◽  
Blue Phosphorene

scholarly journals Boundary effects in bosonic and fermionic field theories

2015 ◽  
Vol 12 (06) ◽  
pp. 1560004 ◽  
Author(s):  
M. Asorey ◽  
D. García-Alvarez ◽  
J. M. Muñoz-Castañeda
Keyword(s):  
Boundary Conditions ◽  
Fundamental Principle ◽  
Field Theories ◽  
Quantum Field Theories ◽  
Quantum Field ◽  
Edge States ◽  
Fermionic Field ◽  
Mass Gap ◽  
Physical Boundary ◽  
General Perspective

The dynamics of quantum field theories on bounded domains requires the introduction of boundary conditions on the quantum fields. We address the problem from a very general perspective by using charge conservation as a fundamental principle for scalar and fermionic quantum field theories. Unitarity arises as a consequence of the choice of charge preserving boundary conditions. This provides a powerful framework for the analysis of global geometrical and topological properties of the space of physical boundary conditions. Boundary conditions which allow the existence of edge states can only arise in theories with a mass gap which is also a physical requirement for topological insulators.

Controllable Tuning of the Spin-Dependent Transport in the Graphene Sheet

2014 ◽  
Vol 668-669 ◽  
pp. 8-11
Author(s):  
Chun Mei Liu ◽  
Zhuan Li ◽  
Jun Ling Wang ◽  
Li Li Zhao ◽  
Yang Wang
Keyword(s):  
Density Functional Theory ◽  
Graphene Sheet ◽  
Density Functional ◽  
Edge States ◽  
Functional Theory ◽  
Spin Dependent Transport ◽  
The Density Functional Theory ◽  
Spin Polarized ◽  
Dependent Transport ◽  
Non Equilibrium Green’S Function

Based on the non-equilibrium Green’s function in combination with the density-functional theory, The spin-dependent transport in the short graphene nanoribbon (graphene sheet) asymmetrically coupled to the electrodes of Au chains is investigated. It is found that a fully spin-polarized current (close to 100%) can be produced at the output port. The physics underlying attributes to the spatially separated edge states of the sheet caused by asymmetric contacts. Especially, the current's spin polarized direction can be tuned simply by changing the contact locations of the electrodes to the graphene sheet.

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