Details

Autor(en) / Beteiligte

• NAIR, R. R
• BLAKE, P
• GRIGORENKO, A. N
• NOVOSELOV, K. S
• BOOTH, T
• STAUBER, T
• PERES, N. M. R
• GEIM, A. K

Titel

Fine Structure Constant Defines Visual Transparency of Graphene

Ist Teil von

• Science (American Association for the Advancement of Science), 2008-06, Vol.320 (5881), p.1308-1308

Ort / Verlag

Washington, DC: American Association for the Advancement of Science

Erscheinungsjahr

2008

Quelle

Science Online_科学在线

Beschreibungen/Notizen

• There are few phenomena in condensed matter physics that are defined only by the fundamental constants and do not depend on material parameters. Examples are the resistivity quantum, h/e2 (h is Planck's constant and e the electron charge), that appears in a variety of transport experiments and the magnetic flux quantum, h/e, playing an important role in the physics of superconductivity. By and large, sophisticated facilities and special measurement conditions are required to observe any of these phenomena. We show that the opacity of suspended graphene is defined solely by the fine structure constant, a = e2/hc feminine 1/137 (where c is the speed of light), the parameter that describes coupling between light and relativistic electrons and that is traditionally associated with quantum electrodynamics rather than materials science. Despite being only one atom thick, graphene is found to absorb a significant (pa = 2.3%) fraction of incident white light, a consequence of graphene's unique electronic structure.