RECORD
Tunable polarization in beam-splitter based on 2D topological insulators
Mesoscale and Nanoscale Physics · Submitted 27 Oct 2013
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim We show that for some parameters of the Fermi energy, the beam splitter device built on 2D TIs can achieve higher in-plane spin polarization than one built on materials described by the Rashba model itself.
The compiled record
The paper's own sentences, arranged. Each label is drawn from a closed vocabulary; the number beside it is the probability the classifier gave that label. Numbers in the tables are the authors', checked by code. No sentence in this record was written by a model.
Open the compiled record
The abstract, sentence by sentence
The typical bulk model describing 2D topological insulators (TI) consists of two types of spin-orbit terms, the so-called Dirac term which induces out-of plane spin polarization and the Rashba term which induces in-plane spin polarization. We show that for some parameters of the Fermi energy, the beam splitter device built on 2D TIs can achieve higher in-plane spin polarization than one built on materials described by the Rashba model itself. Further, due to high tunability of the electron density and the asymmetry of the quantum well, spin polarization in different directions can be obtained. While in the normal (topologically trivial) regime the in-plane spin polarization would dominate, in the inverted regime the out-of-plane polarization is more significant not only in the band gap but also for small Fermi energies above the gap. Further, we suggest a double beam splitter scheme, to measure in-plane spin current all electrically. Although we consider here as an example HgTe/CdTe quantum wells, this scheme could be also promising for InAs/GaSb QWs where the in- and out-of-plane polarization could be achieved in a single device.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | The typical bulk model describing 2D topological insulators (TI) consists of two types of spin-orbit terms, the so-called Dirac term which induces out-of plane spin polarization and the Rashba term which induces in-plane spin polarization. | background 1.00 | 0.05 | 0.03 | asserted 1.00 |
| s1 | We show that for some parameters of the Fermi energy, the beam splitter device built on 2D TIs can achieve higher in-plane spin polarization than one built on materials described by the Rashba model itself. | result 0.98 | 0.93 | 0.59 | asserted 0.93 |
| s2 | Further, due to high tunability of the electron density and the asymmetry of the quantum well, spin polarization in different directions can be obtained. | result 0.90 | 0.64 | 0.11 | asserted 0.90 |
| s3 | While in the normal (topologically trivial) regime the in-plane spin polarization would dominate, in the inverted regime the out-of-plane polarization is more significant not only in the band gap but also for small Fermi energies above the gap. | result 0.97 | 0.73 | 0.17 | asserted 1.00 |
| s4 | Further, we suggest a double beam splitter scheme, to measure in-plane spin current all electrically. | future work 0.53 | 0.41 | 0.10 | hedged possibility 0.98 |
| s5 | Although we consider here as an example HgTe/CdTe quantum wells, this scheme could be also promising for InAs/GaSb QWs where the in- and out-of-plane polarization could be achieved in a single device. | future work 0.84 | 0.19 | 0.06 | hedged possibility 1.00 |
What was examined, and what was not
- arXiv listing abstract v2
- full text
- figures and tables
- references and citing sentences
- relations to other papers
- P abstract
- S sections
- T body sentences
- C citations
- R cross-paper relations
The paper
Original abstract
The typical bulk model describing 2D topological insulators (TI) consists of two types of spin-orbit terms, the so-called Dirac term which induces out-of plane spin polarization and the Rashba term which induces in-plane spin polarization. We show that for some parameters of the Fermi energy, the beam splitter device built on 2D TIs can achieve higher in-plane spin polarization than one built on materials described by the Rashba model itself. Further, due to high tunability of the electron density and the asymmetry of the quantum well, spin polarization in different directions can be obtained. While in the normal (topologically trivial) regime the in-plane spin polarization would dominate, in the inverted regime the out-of-plane polarization is more significant not only in the band gap but also for small Fermi energies above the gap. Further, we suggest a double beam splitter scheme, to measure in-plane spin current all electrically. Although we consider here as an example HgTe/CdTe quantum wells, this scheme could be also promising for InAs/GaSb QWs where the in- and out-of-plane polarization could be achieved in a single device.
Human review
How the literature uses it
What this paper does with the arXiv papers it cites
What it cites
Uses data or values from 1 paper
-
We take the parameters $A = 0.365 eV nm$, $B = -0.50 eV nm^2$, $D = -0.50 eV nm^2$ and $M = 24 meV$, corresponding to a realistic experimental situation [ref] with $d = 5nm$, in the trivial insulating regime.
One-dimensional weak antilocalization and band Berry phases in HgTe wires · Model and Characterization of Polarization · 0.93
Discussion
Know something about this paper? Leave a comment, or highlight any passage above to comment on it.