Visit: www.graphenecenter.org

Antonio H. Castro Neto

Centre for Advanced 2D materials and Graphene Research Centre

Department of PhysicsDept. of Electrical and Computer Engineering

Dept. of Materials Science Engineering

National University of Singapore

Universidade Presbiteriana Mackenzie (UPM) - NUS

January 20th, 2012

MackGraphe - Centre for Graphene and Advanced Nano-Materials

UPM is investing ~ US$ 20 million. FAPESP is investing US$ 5 million via the SPEC program.

Two-dimensional crystals

K.S. Novoselov, D. Jiang, T. Booth, V.V. Khotkevich, S. V. Morozov, & A.K. Geim. Two Dimensional Atomic Crystals. PNAS 102, 10451-10453 (2005).

Not 2DEG: non-trivial orbital properties. Transparent: non-trivial optical properties. Soft: non-trivial structural properties. Strain: tailoring of electronic properties. Chemical functionalization: tailoring

chemical, structural and electronic properties.

Manganites

In 2D: Doping = Field Effect

Non-trivial orbital properties

In 2D: Coulomb interactions are long range

Linjun Li, Eoin C.T. O'Farrell, K. P. Loh, B. Oezyilmaz, A.H. Castro Neto

Controlling Many-Body States by Electric Field Effect in 2D Materials:

the case of TiSe2

Physical Interpretation

Cooper Pairing

McMillan, W. L. Phys. Rev. B 12, 1197-1199 (1975)

The CDW discommensurations drive local pairing:

Pair density wave

P4

Phosphorene

Pressure5 GPa 10 GPa

Orthorhombic Rhombohedral Simple Cubic

8

Black Phosphorus: phosphorene Phys. Rev. Lett. 112, 176801

50 µm

Electric field effect in few-layer black phosphorus Steven P. Koenig, Rostislav A. Doganov, Henrick Schmidt, A. H. Castro Neto, Barbaros Oezilmaz

Appl. Phys. Lett. 104, 103106 (2014)

~10 nm

It rusts !

µ=600 cm2/Vs

Phys. Rev. Lett. 114, 046801 (2015)

Phys. Rev. B 91, 085407 (2015)

A New Route to Graphene Processing by Selective Laser AblationS. Dhar, A. Roy Barman1, G.X. Ni, X. Wang, X. F. Xu, Y. Zheng, S. Tripathy, Ariando, A. Rusydi1, K. P. Loh, M. Rubhausen, A. H. Castro Neto, B. Oezyilmaz and T. Venkatesan, AIP Advances 1, 022109 (2011).

Colossal nonlinear optical response of PhosphoreneM. J. L. F. Rodrigues, Christiano J. S. de Matos, Hsin-Yu Wu, Ho Yi Wei, A. Carvalho, F.Hipolito, A. H. Castro Neto & J. Viana-Gomes

100 fs duration laser pulses at a 1560 nm wavelength (80MHz repetition rate)

Supported by FAPESP and NRF

Artificial 3D Heterostructures

Graphene

WS2

Graphane

Fluorographene

MoS2

Boron Nitride

Courtesy: K. Novoselov

Paving the way. Example 1: electronics

Paving the way. Example 2: photovoltaics

Published in Science

BN

Graphene

WS2

Graphene

Au

Conclusions

A new 2D material science and technology is emerging from the “graphene experience”. New 2D materials, such as TMDCs and phosphorene, have properties which are rather different the ones found in 3D materials. Artificial 3D heterostructures of 2D materials provide new opportunities which still remain unexplored. Computational science will play an important role in this exploration. Terra plana (2D) is a fertile terrain of open fields for growth and exploration !

Thank you !