Graphene is a single layer of carbon atoms arranged in a honeycomb structure. We create single- and few-layer graphene and employ optical spectroscopic techniques to explore their properties.
Optical properties of single-layer graphene
Measurement of the optical conductivity of graphene
K. F. Mak, M. Y. Sfeir, Y. Wu, C. H. Lui, J. A. Misewich, and T. F. Heinz, Phys. Rev. Lett. 101, 196405 (2008).
Optical spectroscopy of graphene: From the far infrared to the ultraviolet
K. F. Mak, L. Ju, F. Wang, and T. F. Heinz, Solid State Commun. 152, 1341-1349 (2012).
Observation of intra- and inter-band transitions in the optical response of graphene
L. M. Malard, K. F. Mak, A. H. Castro Neto, N. M. R. Peres, and T. F. Heinz, New J. Phys. 15, 015009 (2013).
X. Gan, R. J. Shiue, Y. Gao, K. F. Mak, X. Yao, L. Li, A. Szep, D. Walker Jr., J. Hone, T. F. Heinz, and D. Englund, Nano Lett. 13, 691-696 (2013).
Strong enhancement of light-matter interaction in graphene coupled to a photonic crystal nanocavity
X. Gan, K. F. Mak, Y. Gao, Y. You, F. Hatami, J. Hone, T. F. Heinz, and D. Englund, Nano Lett. 12, 5626-5631 (2012).
Many-body effects in graphene
Tuning many-body interactions in graphene: The effects of doping on excitons and carrier lifetimes
K. F. Mak, F. Jornada, K. He, N. Petrone, J. Hone, J. Shan, S. G. Louie, and T. F. Heinz, Phys. Rev. Lett. 112, 207401 (2014).
K. F. Mak, J. Shan, and T. F. Heinz, Phys. Rev. Lett. 106, 046401 (2011).
Band gap tuning
Observation of an electric-field-induced band gap in bilayer graphene by infrared spectroscopy
K. F. Mak, C. H. Lui, J. Shan, and T. F. Heinz, Phys. Rev. Lett. 102, 256405 (2009).
Observation of an electrically tunable band gap in trilayer graphene
C. H. Lui, Z. Li, K. F. Mak, E. Cappelluti, and T. F. Heinz, Nature Phys. 7, 944-947 (2011).
Few-layer graphene: electronic and vibrational properties
K. F. Mak, J. Shan, and T. F. Heinz, Phys. Rev. Lett. 104, 176404 (2010).
The evolution of electronic structure in few-layer graphene revealed by optical spectroscopy
K. F. Mak, M. Y. Sfeir, J. A. Misewich, and T. F. Heinz, Proc. Nat. Acad. Sci. 107, 14999 – 15004 (2010).
Real-time observation of interlayer vibrations in bilayer and few-layer graphene
D. Boschetto, L. Malard, C. H. Lui, K. F. Mak, Z. Li, H. Yan, and T. F. Heinz, Nano Lett. 13, 4620-4623 (2013).
Structurally dependent Fano resonances in the infrared spectra of phonons in few-layer graphene
Z. Li, C.H. Lui, E. Cappelluti, L. Benfatto, K. F. Mak, G. L. Carr, J. Shan, and T. F. Heinz, Phys. Rev. Lett. 108, 156801 (2012).
Non-equilibrium properties of graphene
Measurement of the thermal conductance of the graphene/SiO2 interface
K. F. Mak, C. H. Lui, and T. F. Heinz, Appl. Phys. Lett. 97, 221904 (2010).
Ultrafast photoluminescence from graphene
C. H. Lui, K. F. Mak, J. Shan, and T. F. Heinz, Phys. Rev. Lett. 105, 127404 (2010).
Electron and optical phonon temperatures in electrically biased graphene
S. Berciaud, M. Y. Han, K. F. Mak, L. E. Brus, P. Kim, and T. F. Heinz, Phys. Rev. Lett. 104, 227401 (2010),
H. Yan, D. Song, K. F. Mak, I. Chatzakis, J. Maultzsch, and T. F. Heinz, Phys. Rev. B 80, 121403(R) (2009).