F
Freddie Withers
Researcher at University of Exeter
Publications - 76
Citations - 8444
Freddie Withers is an academic researcher from University of Exeter. The author has contributed to research in topics: Graphene & Exciton. The author has an hindex of 35, co-authored 72 publications receiving 6834 citations. Previous affiliations of Freddie Withers include University of Manchester.
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Journal ArticleDOI
Light-emitting diodes by band-structure engineering in van der Waals heterostructures
Freddie Withers,O. Del Pozo-Zamudio,Artem Mishchenko,A. P. Rooney,Ali Gholinia,Kenji Watanabe,T. Taniguchi,Sarah J. Haigh,Andre K. Geim,Alexander I. Tartakovskii,Kostya S. Novoselov +10 more
TL;DR: In this paper, the authors describe light-emitting diodes (LEDs) made by stacking metallic graphene, insulating hexagonal boron nitride and various semiconducting monolayers into complex but carefully designed sequences.
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Detecting topological currents in graphene superlattices
Roman V. Gorbachev,Justin C. W. Song,Justin C. W. Song,Geliang Yu,Andrey V. Kretinin,Freddie Withers,Yang Cao,Artem Mishchenko,Irina V. Grigorieva,Konstantin S. Novoselov,Leonid Levitov,Andre K. Geim +11 more
TL;DR: In this article, a nonlocal voltage at zero magnetic field in a narrow energy range near Dirac points at distances as large as several micrometers away from the nominal current path was observed, indicating large valley-Hall angles.
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Electronic Properties of Graphene Encapsulated with Different Two-Dimensional Atomic Crystals
Andrey V. Kretinin,Yang Cao,J. S. Tu,Geliang Yu,Rashid Jalil,Kostya S. Novoselov,Sarah J. Haigh,Ali Gholinia,Artem Mishchenko,M. Lozada,Thanasis Georgiou,Colin R. Woods,Freddie Withers,Peter Blake,Goki Eda,A. Wirsig,C. Hucho,Kenji Watanabe,T. Taniguchi,Andre K. Geim,Roman V. Gorbachev +20 more
TL;DR: This work reports on the search for alternative substrates for making quality graphene heterostructures using atomically flat crystals and attributes the difference mainly to self-cleansing that takes place at interfaces between graphene, hBN, and transition metal dichalcogenides.
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Twist-controlled resonant tunnelling in graphene/boron nitride/graphene heterostructures
Artem Mishchenko,J. S. Tu,Y. Cao,Roman V. Gorbachev,John Wallbank,Mark Greenaway,V. E. Morozov,Sergey V. Morozov,Mengjian Zhu,Swee Liang Wong,Freddie Withers,Colin R. Woods,Y-J Kim,Kenji Watanabe,T. Taniguchi,E. E. Vdovin,Oleg Makarovsky,T. M. Fromhold,Vladimir I. Fal'ko,Andre K. Geim,Laurence Eaves,Konstantin S. Novoselov +21 more
TL;DR: It is demonstrated how careful alignment of the crystallographic orientation of two graphene electrodes separated by a layer of hexagonal boron nitride in a transistor device can achieve resonant tunnelling with conservation of electron energy, momentum and, potentially, chirality.
Journal ArticleDOI
Exciton-polaritons in van der Waals heterostructures embedded in tunable microcavities.
S. Dufferwiel,S. Schwarz,Freddie Withers,Aa A. P. Trichet,Feng Li,M. Sich,O. Del Pozo-Zamudio,C. Clark,Anton Nalitov,Anton Nalitov,Dmitry Solnyshkov,Guillaume Malpuech,K. S. Novoselov,Jm M. Smith,M. S. Skolnick,Dn N. Krizhanovskii,Ai I. Tartakovskii +16 more
TL;DR: The results pave the way for room-temperature polaritonic devices based on multiple-quantum-well van der Waals heterostructures, where polariton condensation and electrical polariton injection through the incorporation of graphene contacts may be realized.