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Two-photon absorption in gapped bilayer graphene with a tunable chemical potential
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA.
2016 (English)In: Journal of Physics: Condensed Matter, ISSN 0953-8984, E-ISSN 1361-648X, Vol. 28, no 36, 365001Article in journal (Refereed) Published
Abstract [en]

Despite the now vast body of two-dimensional materials under study, bilayer graphene remains unique in two ways: it hosts a simultaneously tunable band gap and electron density; and stems from simple fabrication methods. These two advantages underscore why bilayer graphene is critical as a material for optoelectronic applications. In the work that follows, we calculate the one-and two-photon absorption coefficients for degenerate interband absorption in a graphene bilayer hosting an asymmetry gap and adjustable chemical potential-all at finite temperature. Our analysis is comprehensive, characterizing one-and two-photon absorptive behavior over wide ranges of photon energy, gap, chemical potential, and thermal broadening. The two-photon absorption coefficient for bilayer graphene displays a rich structure as a function of photon energy and band gap due to the existence of multiple absorption pathways and the nontrivial dispersion of the low energy bands. This systematic work will prove integral to the design of bilayer-graphene-based nonlinear optical devices.

Place, publisher, year, edition, pages
Institute of Physics Publishing (IOPP), 2016. Vol. 28, no 36, 365001
Keyword [en]
graphene, optoelectronics, two photon absorption, gating, bilayer graphene
National Category
Physical Sciences
URN: urn:nbn:se:kth:diva-191738DOI: 10.1088/0953-8984/28/36/365001ISI: 000380754400009PubMedID: 27392275ScopusID: 2-s2.0-84979632808OAI: diva2:957494
EU, European Research Council, DM-321031

QC 20160902

Available from: 2016-09-02 Created: 2016-09-02 Last updated: 2016-09-02Bibliographically approved

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Abergel, David S.
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