Tunable Infrared Phonon Anomalies in Trilayer Graphene

Chun Hung Lui (呂振鴻), Emmanuele Cappelluti, Zhiqiang Li, and Tony F. Heinz
Phys. Rev. Lett. 110, 185504 – Published 1 May 2013
PDFHTMLExport Citation


Trilayer graphene in both ABA (Bernal) and ABC (rhombohedral) stacking sequences is shown to exhibit intense infrared absorption from in-plane optical phonons. The phonon feature, lying at 1580cm1, changes strongly with electrostatic gating. For ABC-stacked graphene trilayers, we observed a large enhancement in phonon absorption amplitude, as well as softening of the phonon mode, as the Fermi level is tuned away from charge neutrality. A similar, but substantially weaker, effect is seen in samples with the more common ABA stacking order. The strong infrared response of the optical phonons and the pronounced variation with electrostatic gating and stacking order reflect the interactions of the phonons and electronic excitations in the two systems. The key experimental findings can be reproduced within a simplified charged-phonon model that considers the influence of charging through Pauli blocking of the electronic transitions.

  • Received 21 January 2013


© 2013 American Physical Society

Authors & Affiliations

Chun Hung Lui (呂振鴻)1, Emmanuele Cappelluti2,3, Zhiqiang Li1, and Tony F. Heinz1

  • 1Departments of Physics and Electrical Engineering, Columbia University, 538 West 120th Street, New York, New York 10027, USA
  • 2Istituto dei Sistemi Complessi (ISC), CNR, U.O.S. Sapienza, v. dei Taurini 19, 00185 Rome, Italy
  • 3Instituto de Ciencia de Materiales de Madrid (ICMM), CSIC, Cantoblanco, 28049 Madrid, Spain

Article Text (Subscription Required)

Click to Expand

Supplemental Material (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand

Vol. 110, Iss. 18 — 3 May 2013

Reuse & Permissions
Access Options

Article Available via CHORUS

Download Accepted Manuscript
Heating up of Superconductors
January 27, 2017

This collection marks the 30th anniversary of the discovery of high-temperature superconductors. The papers selected highlight some of the advances that have been made to date, both in understanding why these compounds behave in the way they do, and in utilizing them in applications. The papers included in the collection have been made free to read.

Authorization Required




Sign up to receive regular email alerts from Physical Review Letters

Log In



Article Lookup

Paste a citation or DOI

Enter a citation