First direct observation of Spin-textures in Topological Insulators : Spin-resolved ARPES as a probe of topological quantum spin Hall effect and Berry's phase - Condensed Matter > Mesoscale and Nanoscale PhysicsReportar como inadecuado




First direct observation of Spin-textures in Topological Insulators : Spin-resolved ARPES as a probe of topological quantum spin Hall effect and Berry's phase - Condensed Matter > Mesoscale and Nanoscale Physics - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

Abstract: A topologically ordered material is characterized by a rare quantumorganization of electrons that evades the conventional spontaneously brokensymmetry based classification of condensed matter. Exotic spin transportphenomena such as the dissipationless quantum spin Hall effect have beenspeculated to originate from a novel topological order whose identificationrequires a spin sensitive measurement, which does not exist to this date in anysystem neither in HgCdTe quantum wells nor in the topological insulatorBiSb. Using Mott polarimetry, we probe the spin degrees of freedom of thesequantum spin Hall states and demonstrate that topological quantum numbers areuniquely determined from spin texture imaging measurements. Applying thismethod to the Bi{1-x}Sb{x} series, we identify the origin of its novel orderand unusual chiral properties. These results taken together constitute thefirst observation of surface electrons collectively carrying a geometricalquantum Berry-s phase and definite chirality mirror Chern number, n M =-1,which are the key electronic properties for realizing topological computingbits with intrinsic spin Hall-like topological phenomena. Our spin-resolvedresults not only provides the first clear proof of a topological insulatingstate in nature but also demonstrate the utility of spin-resolved ARPEStechnique in measuring the quantum spin Hall phases of matter.



Autor: D. Hsieh, Y. Xia, L. Wray, D. Qian, A. Pal, J. H. Dil, F. Meier, J. Osterwalder, G. Bihlmayer, C. L. Kane, Y. S. Hor, R. J. Cava,

Fuente: https://arxiv.org/



DESCARGAR PDF




Documentos relacionados