OxTalks is Changing
OxTalks will soon move to the new Halo platform and will become 'Oxford Events.' There will be a need for an OxTalks freeze. This was previously planned for Friday 14th November – a new date will be shared as soon as it is available (full details will be available on the Staff Gateway).
In the meantime, the OxTalks site will remain active and events will continue to be published.
If staff have any questions about the Oxford Events launch, please contact halo@digital.ox.ac.uk
Tuning the Electronic Phases of Graphene Nanoribbons
Graphene nanoribbons (GNRs) are a fascinating class of quasi-one-dimensional semiconductors consisting of nanometer-wide strips of hexagonally bonded carbon atoms [1]. Recent progress in fabrication techniques have enabled the realization of atomically precise GNRs with diverse edge geometries, widths, and complex nanoarchitectures [2]. In this talk, I will present graphene nanoribbons as a promising platform for controlling and manipulating unconventional electronic phases, drawing from both ab initio and model Hamiltonian calculations. First, I will explore the emergence of topological phases in armchair-edged nanoribbons induced by lattice deformations [3]. Second, I will demonstrate the formation of half-semimetallic phases in zigzag-edged nanoribbons upon incorporation into a lateral heterostructure [4, 5]. Third, I will discuss the development of ultra-flat bands and π-electron magnetism in chevron-edged graphene nanoribbons under an external electric field [6]. These findings may open new possibilities for engineering quantum phases in one-dimensional crystals, with potential applications in spintronics and related device concepts.
[1] O. V. Yazyev, Account of Chemical Research 46, 2319 (2013).
[2] A. Narita, K. Müllen, Advanced Materials 32, 2001893 (2020).
[3] N. V. Tepliakov, J, Lischner, E. Kaxiras, A. A. Mostofi, M. Pizzochero, Physical Review Letters 130, 026401 (2023).
[4] N. V. Tepliakov, R. Ma, J. Lischner, E. Kaxiras, A. A. Mostofi, M. Pizzochero, Nano Letters 23, 6698 (2024).
[5] M. Pizzochero, N. V. Tepliakov, J. Lischner, A. A. Mostofi, E. Kaxiras, Nano Letters 24, 6521 (2024).
[6] R. Ma, N. V. Tepliakov, A. A. Mostofi, M. Pizzochero, in preparation
Date:
12 November 2024, 14:00
Venue:
Hume-Rothery Building, Parks Road, Oxford OX1 3PH & https://ox.cloud.panopto.eu/Panopto/Pages/Viewer.aspx?id=cc1170b2-c2bf-402e-8259-b2210085ce95
Speaker:
Michele Pizzochero (Harvard University)
Organising department:
Department of Materials
Organiser:
Joseph Prentice (University of Oxford)
Organiser contact email address:
joseph.prentice@materials.ox.ac.uk
Part of:
Oxford Advanced Materials Network (OxAMN)
Booking required?:
Not required
Audience:
Members of the University only
Editor:
Samantha Pearce
