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
Chemistry, Multidisciplinary
Jingwei Jiang, Steven G. Louie
Summary: This study applies topological classification theory using chiral symmetry to graphene nanoribbons, introducing a new Z classification method called chiral phase index. The approach is applicable to GNRs with arbitrary terminations and any quasi one-dimensional chiral structures, resolving an experimental puzzle and deriving a simple analytic formula for the CPI of armchair GNRs. Furthermore, a novel GNR with periodic localized moments and strong spin-spin exchange coupling is designed based on the CPI, enabling access to electron spin behavior.
Article
Chemistry, Physical
Ziqi Han, Hua Hao, Xiaohong Zheng, Zhi Zeng
Summary: In this study, the spin-dependent transport properties of zigzag graphene nanoribbons (ZGNR) with asymmetric edge hydrogenation and different magnetic configurations were investigated using the non-equilibrium Green's function method combined with density functional calculations. The results showed that changing the magnetic configurations of the electrodes from parallel to antiparallel resulted in substantial changes in the currents in the tunnel junction, leading to a high conductance state and a low conductance state with a tunnel magnetoresistance (TMR) ratio larger than 1 x 10(5)%. Furthermore, an ideal bipolar spin filtering effect was observed in the parallel magnetic configurations, allowing for flexible switching of the spin polarity of current by reversing the bias direction. These findings indicate that asymmetric edge hydrogenation provides an important approach for constructing multi-functional spintronic devices with ZGNRs.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Multidisciplinary Sciences
Jie Yang, Jun Luo, Changjiang Yi, Youguo Shi, Yi Zhou, Guo-qing Zheng
Summary: K2Cr3As3 is a new type of spin-triplet superconductor with unique magnetic properties and superconducting behavior, making it a promising platform for the study of topological superconductivity and potential technological applications.
Article
Multidisciplinary Sciences
Song Jiang, Tomas Neuman, Alex Boeglin, Fabrice Scheurer, Guillaume Schull
Summary: In this study, the intrinsic optoelectronic properties of graphene nanoribbons (GNRs) were explored using a scanning tunneling microscope-based method. By transferring the GNRs onto a partially insulating surface, luminescence quenching effects were prevented and localized dark excitons associated with the topological end states of the GNRs were observed.
Article
Chemistry, Multidisciplinary
Rajeev K. Dubey, Mauro Marongiu, Shuai Fu, Guanzhao Wen, Mischa Bonn, Hai I. Wang, Manuel Melle-Franco, Aurelio Mateo-Alonso
Summary: This study presents an accelerated iterative approach for the synthesis of length-controlled, ultralong, atomically precise graphene nanoribbons (GNRs). The method allows for the exploration of the effects of GNR length on their properties, and enables the purification and characterization of these GNRs.
Article
Physics, Multidisciplinary
Jonathan B. Curtis, Nicholas R. Poniatowski, Yonglong Xie, Amir Yacoby, Eugene Demler, Prineha Narang
Summary: A recent experiment demonstrated that proximity-induced Ising spin-orbit coupling can enhance spin-triplet superconductivity in Bernal bilayer graphene. However, the fluctuations of the spin orientation of the triplet order parameter in graphene suppress the superconducting transition to nearly zero temperature due to its perfect spin rotation symmetry. Both Ising spin-orbit coupling and an in-plane magnetic field can eliminate these fluctuations, significantly increasing the transition temperature, as supported by our analysis and consistent with the experiment. Our model also suggests the existence of a phase with quasilong-range ordered spin-singlet charge 4e superconductivity at low anisotropy and magnetic field, while the triplet 2e superconducting order only exhibits short-ranged correlations. Relevant experimental signatures are discussed.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Multidisciplinary
Ran He, Dan Wang, Nannan Luo, Jiang Zeng, Ke-Qiu Chen, Li-Ming Tang
Summary: In this study, nonrelativistic spin-momentum coupling is predicted in two-dimensional materials. Twist operations in antiferromagnetic bilayers can induce spin splitting comparable to spin-orbit coupling, and generate a transverse spin current with a high charge-spin conversion ratio. These findings demonstrate the potential for achieving electrically controlled magnetism in materials without spin-orbit coupling.
PHYSICAL REVIEW LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Fei Xue, Paul M. Haney
Summary: The key mechanism considered in this study is the staggered dampinglike spin-orbit torque in antiferromagnets, particularly illustrated through examining the van der Waals antiferromagnetic bilayer CrI3. The deterministic electrical switching of the Neel vector is shown to result from the staggered dampinglike spin-orbit torque on the magnetic sublattices.
Article
Chemistry, Multidisciplinary
Kewei Sun, Orlando J. Silveira, Shohei Saito, Keisuke Sagisaka, Shigehiro Yamaguchi, Adam S. Foster, Shigeki Kawai
Summary: The design of magnetic topological states due to spin polarization in an extended pi carbon system has great potential in spintronics application. This study investigates the real-space observation and manipulation of spin polarization in a heteroatom substituted system by using low-temperature scanning tunneling microscopy/spectroscopy and density functional theory calculations. The results show that a clear Kondo resonance peak appeared at a boron site embedded at the center of an armchair-type graphene nanoribbon (GNR) on a AuSiX/Au(111) surface, and this magnetic state can be relayed along the longitudinal axis of the GNR by sequential removal of Si atoms.
Article
Chemistry, Multidisciplinary
Ryan D. McCurdy, Aidan Delgado, Jingwei Jiang, Junmian Zhu, Ethan Chi Ho Wen, Raymond E. Blackwell, Gregory C. Veber, Shenkai Wang, Steven G. Louie, Felix R. Fischer
Summary: Metallic graphenenanoribbons (GNRs) are essential for low-dimensional functional materials technology as 1D interconnects for electronic and quantum information transport. However, the design and assembly of metallic GNRs have been hindered by the structural constraints in on-surface bottom-up synthesis and limited control over the orientation and sequence of asymmetric monomer building blocks during polymerization. In this study, we report the successful synthesis of GNRs with robust metallic states by embedding a symmetric zero-mode superlattice along the backbone.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Review
Chemistry, Multidisciplinary
Wenhui Niu, Ji Ma, Xinliang Feng
Summary: This article presents the current research status of graphene nanoribbons (GNRs), with a focus on the bottom-up synthesis, characterization, and optoelectronic properties of cove or fjord-edged cGNRs. It also discusses the challenges and prospects in the design and synthesis of cGNRs, aiming to stimulate further development through interdisciplinary collaborations.
ACCOUNTS OF CHEMICAL RESEARCH
(2022)
Article
Nanoscience & Nanotechnology
Talieh S. Ghiasi, Alexey A. Kaverzin, Avalon H. Dismukes, Dennis K. de Wal, Xavier Roy, Bart J. van Wees
Summary: The coupling of bilayer graphene with the 2D interlayer antiferromagnetic CrSBr enables the active generation of spin currents in graphene, benefiting ultracompact spintronic devices. The strong spin-charge coupling in graphene and the high sensitivity of spin transport to the adjacent antiferromagnet's magnetization allow for the read-out of a single magnetic sublattice.
NATURE NANOTECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Wenhao Huang, Oliver Braun, David I. Indolese, Gabriela Borin Barin, Guido Gandus, Michael Stiefel, Antonis Olziersky, Klaus Mu''llen, Mathieu Luisier, Daniele Passerone, Pascal Ruffieux, Christian Scho''nenberger, Kenji Watanabe, Takashi Taniguchi, Roman Fasel, Jian Zhang, Michel Calame, Mickael L. Perrin
Summary: Bottom-up-synthesized graphene nanoribbons (GNRs) are a type of designer quantum materials with superior properties and have potential applications in various fields. However, making electrical contact with GNRs is still a major challenge due to their small size.
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
Filippo Morini, Noboru Watanabe, Masataka Kojima, Michael Simon Deleuze, Masahiko Takahashi
JOURNAL OF CHEMICAL PHYSICS
(2015)
Article
Chemistry, Physical
Filippo Morini, Michael S. Deleuze, Noboru Watanabe, Masahiko Takahashi
JOURNAL OF CHEMICAL PHYSICS
(2015)
Article
Biochemistry & Molecular Biology
Abolfazl Shiroudi, Michael S. Deleuze
JOURNAL OF MOLECULAR MODELING
(2015)
Article
Chemistry, Physical
A. Shiroudi, M. S. Deleuze, S. Canneaux
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2015)
Article
Chemistry, Physical
Abolfazl Shiroudi, Michael S. Deleuze
COMPUTATIONAL AND THEORETICAL CHEMISTRY
(2015)
Article
Optics
M. Farasat, S. H. R. Shojaei, F. Morini, M. M. Golzan, M. S. Deleuze
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS
(2016)
Article
Chemistry, Physical
Abolfazl Shiroudi, Michael S. Deleuze
PROGRESS IN REACTION KINETICS AND MECHANISM
(2016)
Article
Chemistry, Multidisciplinary
Ehsan Zahedi, Majid Mozaffari, Farzaneh Shahsavar, Abolfazl Shiroudi, Michael S. Deleuze
RESEARCH ON CHEMICAL INTERMEDIATES
(2017)
Article
Chemistry, Physical
S. H. Reza Shojaei, Filippo Morini, Michael S. Deleuze
Article
Chemistry, Physical
Abolfazl Shiroudi, Michael S. Deleuze
JOURNAL OF PHYSICAL CHEMISTRY A
(2014)
Article
Chemistry, Physical
Abolfazl Shiroudi, Michael S. Deleuze, Sebastien Canneaux
JOURNAL OF PHYSICAL CHEMISTRY A
(2014)
Article
Optics
F. Morini, S. H. Reza Shojaei, M. S. Deleuze
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS
(2014)
Article
Instruments & Instrumentation
T. Andre, F. Morini, M. Karamitros, R. Delorme, C. Le Loirec, L. Campos, C. Champion, J. -E. Groetz, M. Fromm, M. -C. Bordage, Y. Perrot, Ph Barberet, M. A. Bernal, J. M. C. Brown, M. S. Deleuze, Z. Francis, V. Ivanchenko, B. Mascialino, C. Zacharatou, M. Bardies, S. Incerti
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS
(2014)
Proceedings Paper
Engineering, Electrical & Electronic
F. Morini, M. S. Deleuze, N. Watanabe, M. Takahashi
XXIX INTERNATIONAL CONFERENCE ON PHOTONIC, ELECTRONIC, AND ATOMIC COLLISIONS (ICPEAC2015), PTS 1-12
(2015)
Correction
Chemistry, Physical
S. H. Reza Shojaei, Filippo Morini, Michael S. Deleuze