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						<h1 itemprop="headline">Seminar - Sanjoy K. Mahatha</h1>
						
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							<p class="text--intro" itemprop="description">Title: Absence of Dirac cones in monolayer silicene and multilayer Si films on Ag(111)</p>
						
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														Wednesday 18  May 2016,
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														&nbsp;at 11:00 -  12:30
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<h4><strong>Talk by Sanjoy&nbsp;K. Mahatha</strong></h4>
<p><em>Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche, I-34149 Trieste, Italy</em>
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<p><strong>Titel:</strong> Absence of Dirac cones in monolayer silicene and multilayer Si films on Ag(111)
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<p><strong>Abstract: </strong>Honeycomb structured (4×4) monolayer silicene and (?3×?3)R30° multilayer silicon on Ag(111) have attracted a lot of interest with photoemission studies indicating the presence of ?-band Dirac cones near the Fermi level.<sup>1,2</sup> In this talk, I will show instead that the ?-symmetry states of monolayer silicene lose their local character and the Dirac cones fade out. An interface state of free-electron-like Ag origin accounts for the spectral features that were attributed to silicene ?-bands.<sup>3,4</sup> For multilayer silicon, the bands previously attributed to ?* state with Dirac fermion character are found to derive from the well-known Ag- (?3×?3)R30°-Si(111) structure, and from a Si modified Ag(111) interface states.<sup>5</sup>&nbsp; 
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<p><sup>1</sup> P. Vogt <em>et al</em>., Phys. Rev. Lett. <strong>108</strong>, 155501 (2012).
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<p><sup>2 </sup>P. De Padova <em>et al</em>., Appl. Phys. Lett. <strong>102</strong>, 163106 (2013), J. Phys.: Condens. Matter <strong>25</strong> 382202 (2013).
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<p><sup>3</sup> D. Tsoutsou <em>et al</em>., Appl. Phys. Lett. <strong>103</strong>, 231604 (2013).
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<p><sup>4</sup> S. K. Mahatha <em>et al</em>., Phys. Rev. B <strong>89</strong>, 201416(R) (2014). 
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<p><sup>5</sup> S. K. Mahatha <em>et al</em>., Phys. Rev. B <strong>92</strong>, 245127 (2015).</p>
								
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