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Observation of Collective Excitations of the Dilute 2D Electron System

Abstract:

We report inelastic light scattering measurements of dispersive spin and charge density excitations in dilute 2D electron systems reaching densities less than 10^{10} cm^{-2}. In the quantum Hall state at nu=2, roton critical points in the spin inter--Landau level mode show a pronounced softening as r_s is increased. Instead of a soft mode instability predicted by Hartree--Fock calculations for r_s ~ 3.3, we find evidence of multiple rotons in the dispersion of the softening spin excitations....

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Publisher copy:
10.1103/PhysRevLett.82.2163

Authors


Eriksson, MA More by this author
Pinczuk, A More by this author
Dennis, BS More by this author
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Institution:
University of Oxford
Department:
Oxford, MPLS, Physics, Theoretical Physics
Pfeiffer, LN More by this author
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Publication date:
1998-10-23
DOI:
URN:
uuid:2e8aeb65-1d11-4282-8854-601d7db4be15
Source identifiers:
500263
Local pid:
pubs:500263
Keywords:

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