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Observations of plasmarons in a two-dimensional system: Tunneling measurements using time-domain capacitance spectroscopy

O. E. Dial, R. C. Ashoori, L. N. Pfeiffer, and K. W. West
Phys. Rev. B 85, 081306(R) – Published 28 February 2012


Calculations of the single-particle density of states (SPDOS) of electron liquids have long predicted that there exist two distinct charged excitations: the usual quasiparticle consisting of an electron or hole, and a plasmaron consisting of a hole resonantly bound to real plasmons in the Fermi sea. Using tunneling spectroscopy to measure the SPDOS of a 2D electronic system, we demonstrate the detection of a plasmaron in a 2D system in which electrons have mass. With the application of a magnetic field we discover unpredicted magnetoplasmarons which resemble Landau levels with a negative index.

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  • Received 25 January 2012


©2012 American Physical Society

Authors & Affiliations

O. E. Dial1,*, R. C. Ashoori1,†, L. N. Pfeiffer2, and K. W. West2

  • 1Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
  • 2Princeton University, Princeton, New Jersey 08544, USA

  • *dial@alum.mit.edu
  • ashoori@mit.edu

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Vol. 85, Iss. 8 — 15 February 2012

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