Observation of gapped quasiparticles in
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Y. Xia; D. Qian; D. Hsieh; L. Wray; L. Viciu; R.J. Cava; M.Z. Hasan
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Article
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2008
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Elsevier Science
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English
โ 251 KB
Using high-resolution photoemission spectroscopy (ARPES), we present a systematic study of the insulating cobaltates. A singleparticle gap opening suggests that due to the material's unique topology an anisotropic particle-hole instability is present. Unlike conventional density waves, charge stripe