Soft Spin Wave Near nu=1: Evidence for a Magnetic Instability in Skyrmion Systems

Details Soft Spin Wave Near nu=1: Evidence for a Magnetic Instability in Skyrmion Systems Soft Spin Wave Near nu=1: Evidence for a Magnetic Instability in Skyrmion Systems

2007-09-04

arxiv.org/abs/0709.0541v2

Phys. Rev. Lett. 100, 086806 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures, to appear in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.100.086806

The ground state of the two dimensional electron gas near $\nu$=1 is investigated by inelastic light scattering measurements carried down to very low temperatures. Away from $\nu$=1, the ferromagnetic spin wave collapses and a new low-energy spin wave emerges below the Zeeman gap. The emergent spin wave shows soft behavior as its energy increases with temperature and reaches the Zeeman energy for temperatures above 2 K. The observed softening indicates an instability of the two dimensional electron gas towards a magnetic order that breaks spin rotational symmetry. We discuss our findings in light of the possible existence of a Skyrme crystal.

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