Role of Symmetry in the Transport Properties of Graphene Nanoribbons under Bias

Li, Zuanyi; Qian, Haiyun; Wu, Jian; Gu, Bing-Lin; Duan, Wenhui

doi:10.1103/physrevlett.100.206802

Cited by 436 publications

(260 citation statements)

References 37 publications

Supporting

Mentioning

244

Contrasting

Unclassified

Order By: Relevance

“…Fig. 1(c) without the SOC, 28 whose main feature is similar to that of free-standing zigzag graphene ribbons 29 . The edge states appear warped with about 0.2-eV dispersion.…”

Section: Resultsmentioning

confidence: 60%

Topological insulators in transition-metal intercalated graphene: The role ofdelectrons in significantly increasing the spin-orbit gap

Tang

Chen

et al. 2013

Phys. Rev. B

Self Cite

View full text Add to dashboard Cite

We study the effect of transition metal intercalation of graphene on the formation of twodimensional topological insulator with experimentally measurable edge states. Our first-principles calculations reveal that the spin-orbit coupling (SOC) gap in Re-intercalated graphene on SiC(0001) substrate can be as large as 100 meV. This value is five orders of magnitude larger than that of pristine graphene. Similar effect should also exist in Mn-or Tc-intercalated graphene. A tight-binding model Hamiltonian analysis establishes the role of orbital coupling between graphene p states and transition metal d states on the formation of the SOC gap. Remarkably, the gap can be larger than atomic SOC, as is the case for Mn. This finding opens the possibility of designing topological insulators comprised of only relatively light elements. Our study also reveals that the presence of the substrate should induce a splitting between the K and K' valleys with the potential to integrate spintronics with valleytronics.

show abstract

“…Fig. 1(c) without the SOC, 28 whose main feature is similar to that of free-standing zigzag graphene ribbons 29 . The edge states appear warped with about 0.2-eV dispersion.…”

Section: Resultsmentioning

confidence: 60%

Topological insulators in transition-metal intercalated graphene: The role ofdelectrons in significantly increasing the spin-orbit gap

Tang

Chen

et al. 2013

Phys. Rev. B

Self Cite

View full text Add to dashboard Cite

show abstract

“…However, the results may be different with respect to the transport properties. It has been found that zigzag graphene nanoribbons have different transport behaviors under bias voltages, depending on the symmetry of the nanoribbons 7,40 . We wonder whether the ZαGNRs would possess similarly symmetry-dependent transport properties as the zigzag graphene nanoribbons do.…”

Section: Resultsmentioning

confidence: 99%

“…In particular, zigzag graphene nanoribbon (ZGNR) has attracted research interest as a hopeful candidate material for spintronics devices, owing to its magnetic zigzag edges 5,6 and unique transport properties 7,8 . So far, a number of theoretical schemes have been proposed in this direction.…”

Section: Introductionmentioning

confidence: 99%

Symmetry-dependent transport properties and bipolar spin filtering in zigzagα-graphyne nanoribbons

Chang

Tan

et al. 2012

Phys. Rev. B

View full text Add to dashboard Cite

First-principles calculations are performed to investigate the transport properties of zigzag α-graphyne nanoribbons (ZαGNRs). It is found that asymmetric ZαGNRs behave as conductors with linear current-voltage relationship, whereas symmetric ZαGNRs have very small currents under finite bias voltages, similar to those of zigzag graphene nanoribbons. The symmetry-dependent transport properties arise from different coupling rules between the π and π * subbands around the Fermi level, which are dependent on the wavefunction symmetry of the two subbands. Based on the coupling rules, we further demonstrate the bipolar spin-filtering effect in the symmetric ZαGNRs. It is shown that nearly 100% spin-polarized current can be produced and modulated by the direction of bias voltage and/or magnetization configuration of the electrodes. Moreover, the magnetoresistance effect with the order larger than 500,000% is also predicted. Our calculations suggest ZαGNRs as one of promising candidate materials for novel spintronics.

show abstract

“…6 Since the magnetic edge states are spatially localized at the edges, they can be utilized as separate spin channels for spin-polarized quantum transport. [7][8][9][10][11][12] Furthermore, such spin channels can be switched on and off by tuning the magnetic moments of the ZGNR through external gates, which is proposed in several theoretical works. [13][14][15][16] So far, most theoretical investigations have been on freestanding ZGNRs.…”

Section: Introductionmentioning

confidence: 99%

Tuning the magnetic moments in zigzag graphene nanoribbons: Effects of metal substrates

2012

View full text Add to dashboard Cite

Role of Symmetry in the Transport Properties of Graphene Nanoribbons under Bias

Cited by 436 publications

References 37 publications

Topological insulators in transition-metal intercalated graphene: The role ofdelectrons in significantly increasing the spin-orbit gap

Topological insulators in transition-metal intercalated graphene: The role ofdelectrons in significantly increasing the spin-orbit gap

Symmetry-dependent transport properties and bipolar spin filtering in zigzagα-graphyne nanoribbons

Tuning the magnetic moments in zigzag graphene nanoribbons: Effects of metal substrates

Contact Info

Product

Resources

About