Article
Chemistry, Multidisciplinary
Thi Thuy Nhung Nguyen, Niels de Vries, Hrag Karakachian, Markus Gruschwitz, Johannes Aprojanz, Alexei A. Zakharov, Craig Polley, Thiagarajan Balasubramanian, Ulrich Starke, Cornelis F. J. Flipse, Christoph Tegenkamp
Summary: Protected and spin-polarized transport channels are identified in epitaxially grown zigzag graphene nanoribbons (zz-GNRs), despite weak spin-orbit interaction. The structure exhibits a surface state on the SiC(0001) substrate merging into the lower edge. Spectroscopic details are described using a tight binding model with a Haldane term and strain effects, revealing a breaking of time-reversal symmetry without external magnetic fields. Ballistic transport indicates a conductivity of G = e(2)/h.
Editorial Material
Multidisciplinary Sciences
Aran Garcia-Lekue, Daniel Sanchez-Portal
Summary: The inclusion of nitrogen atoms stabilizes the zigzag edges of carbon-based nanoribbons, enabling them to be decoupled from a substrate and providing a probe for their unconventional magnetism.
Article
Chemistry, Multidisciplinary
Amogh Kinikar, Xiushang Xu, Marco Di Giovannantonio, Oliver Groening, Kristjan Eimre, Carlo A. Pignedoli, Klaus Muellen, Akimitsu Narita, Pascal Ruffieux, Roman Fasel
Summary: In this study, a new design motif is introduced to synthesize edge-extended zigzag graphene nanoribbons (ZGNRs). Using scanning probe techniques and density functional theory, the chemical structure and electronic characteristics of a 3-zigzag-row ZGNR instance are confirmed. This approach expands the range of possible ZGNRs, contributing to further understanding of structure-dependent electronic properties in GNRs.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Xiushang Xu, Kewei Sun, Atsushi Ishikawa, Akimitsu Narita, Shigeki Kawai
Summary: Graphene nanoribbons and nanographenes synthesized on surfaces have great potential for studying magnetism in nano-spintronics. In this study, unprecedented 7-armchair GNRs with p-extended structures were synthesized and shown to exhibit Kondo resonances even on bare Au(111). The unique nonplanar termini formed by rearrangement reactions reduce the interaction with the Au(111) surface, allowing for spin localization and control of magnetism on metal substrates.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Physics, Condensed Matter
Xiao-Dong Tan, Le Zhang
Summary: This study investigates quantum teleportation between narrow armchair graphene nanoribbons (GNRs) with zigzag ends, and discusses in detail the influences of Coulomb repulsion, temperature, and ribbon length on the output state and teleportation fidelity. Furthermore, a scheme for implementing single-qubit and two-qubit gates in graphene nanoribbons is proposed.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2022)
Article
Multidisciplinary Sciences
Raymond E. Blackwell, Fangzhou Zhao, Erin Brooks, Junmian Zhu, Ilya Piskun, Shenkai Wang, Aidan Delgado, Yea-Lee Lee, Steven G. Louie, Felix R. Fischer
Summary: Spin-ordered electronic states in hydrogen-terminated zigzag nanographene lead to magnetic quantum phenomena, sparking interest in carbon-based spintronics. Zigzag graphene nanoribbons have intrinsic electronic edge states that are ferromagnetically ordered along the edges and antiferromagnetically coupled across its width. By introducing substitutional N-atom dopants along the edges of a ZGNR, the spin-polarized edge states can be stabilized and electronically decoupled, revealing a giant spin splitting and confirming the emergence of magnetic order in ZGNRs.
Article
Chemistry, Physical
Prashant P. Shinde, Jia Liu, Thomas Dienel, Oliver Groening, Tim Dumslaff, Markus Muhlinghaus, Akimitsu Narita, Klaus Muellen, Carlo A. Pignedoli, Roman Fasel, Pascal Ruffieux, Daniele Passerone
Summary: A new bottom-up synthesis strategy enables the fabrication of graphene nanoribbons with well-defined width and non-trivial edge structures from specific molecular precursors. The modified nanoribbons exhibit unique electronic properties compared to pristine ones, with a finite band gap and absence of localized edge states. Experimental and theoretical investigations show noticeable localization of electronic states at the modified edges, providing insight into enhancing features for potential applications in nanoelectronics and spintronics.
Article
Materials Science, Multidisciplinary
Cheng Ma, Xiang Gao, Rong Ye, Zhihong Deng, Lei Li, Zao Yi, Jie Li, Guorui Zhou, Zigang Zhou
Summary: Based on the Green-function method and Landauer-Buttiker formalism, this study investigates the spin-dependent electron transport properties of zigzag graphene nanoribbons (ZGNRs) with triangular nanoconstrictions in the presence of ferromagnetic strips and spatial modulation of Rashba spin-orbit coupling (RSOC). The controllability of spin-flip and spin-conserved conductance peaks is demonstrated by adjusting RSOC strength and exchange magnetic field. The local density of states (LDOS) distribution around triangular nanoconstrictions is predicted. The spin filtering effect of ZGNRs with triangular and rectangular nanoconstrictions is compared.
DIAMOND AND RELATED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Xu Wang, Ji Ma, Wenhao Zheng, Silvio Osella, Nicolas Arisnabarreta, Jorn Droste, Gianluca Serra, Oleksandr Ivasenko, Andrea Lucotti, David Beljonne, Mischa Bonn, Xiangyang Liu, Michael Ryan Hansen, Matteo Tommasini, Steven De Feyter, Junzhi Liu, Hai Wang, Xinliang Feng
Summary: The study introduces a novel structure of graphene nanoribbon that can transition between semiconductor and near-metallic properties by adjusting the length of zigzag segments and distance between cove units. A unique member of this GNR family, 6-CZGNR-(2,1), was successfully synthesized through a specific method, exhibiting promising potential in nanoelectronics with a record narrow optical bandgap and high carrier mobility.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Editorial Material
Nanoscience & Nanotechnology
Sheng-Yi Xie, Xian-Bin Li
Summary: The study found a novel method to produce metallic GNRs by inserting a symmetric superlattice into other semiconductive GNRs, broadening their applications in nanoelectronics and fundamental science.
NANO-MICRO LETTERS
(2021)
Article
Physics, Multidisciplinary
Sofia Sanz, Nick Papior, Geza Giedke, Daniel Sanchez-Portal, Mads Brandbyge, Thomas Frederiksen
Summary: This study investigated structures composed of narrow zigzag graphene nanoribbons (GNRs) and found that the beam-splitting effect can survive under Coulomb repulsion and a spin-dependent scattering potential can emerge. The researchers also discovered that this is a general feature with edge-polarized nanoribbons, and near-perfect polarization can be achieved by joining several junctions in series.
PHYSICAL REVIEW LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Fereshte Ildarabadi, Rouhollah Farghadan
Summary: Researchers found that applying nonuniform strain in zigzag graphene nanoribbons can generate spin-thermoelectric effects, leading to a tunable spin-dependent band gap, pure spin current, and a giant spin Seebeck coefficient. This provides a practical pathway for improved design in spin-thermoelectric applications through strain engineering.
Article
Materials Science, Multidisciplinary
Heather M. Hill, Ching-Chen Yeh, Swapnil M. Mhatre, Ngoc Thanh Mai Tran, Hanbyul Jin, Adam J. Biacchi, Chi-Te Liang, Angela R. Hight Walker, Albert F. Rigosi
Summary: We successfully prepared both armchair (AC) and zigzag (ZZ) epitaxial graphene nanoribbons (GNRs) on 4H-SiC using a polymer-assisted sublimation growth method. In this study, we mitigated the risk of GNR deformation along sidewalls by utilizing the physical phenomenon of terrace step formation. Electrical measurements confirmed the expected behaviors of the GNRs, and optical analysis revealed subtle differences among the different GNR species tested.
Article
Physics, Multidisciplinary
Surender Pratap, Sandeep Kumar, Ravi Pratap Singh
Summary: This study investigates the Fano factor and shot noise in the confined region of zigzag graphene nanoribbon (ZGNR). The results show that the Fano factor is approximately 1, indicating the minimum conductivity. The conductivity plot exhibits symmetrical plateaus with respect to Fermi energy. The presence of edge states is confirmed by a peak observed at zero Fermi energy in the local density of states. The study also examines the transmission properties of ZGNR in the confined region, showing potential for pnp type transistors.
FRONTIERS IN PHYSICS
(2022)
Article
Chemistry, Physical
Xiao Chang, Li Huang, Yixuan Gao, Yubin Fu, Ji Ma, Huan Yang, Junzhi Liu, Xiaoshuai Fu, Xiao Lin, Xinliang Feng, Shixuan Du, Hong-Jun Gao
Summary: Successful synthesis of ZGNR with a width of eight carbon zigzag lines and NBN motifs decorated along the edges has been reported. Chemical-bond-resolved nc-AFM imaging confirms the zigzag-terminated edges and the presence of NBN dopants. Intercalation of a silicon layer reveals the electronic states distributed along the zigzag edges. This work enriches the ZGNR family with a new dopant and larger width, providing more candidates for future carbon-based nanoelectronic and spintronic applications.
