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26 April 2024 |
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Mesoscopic electron focusing in topological insulators | | P. Sessi
; P. Rüßmann
; T. Bathon
; A. Barla
; K.A. Kokh
; O.E. Tereshchenko
; K. Fauth
; S.K. Mahatha
; M.A. Valbuena
; S. Godey
; A. Mugarza
; P. Gargiani
; M. Valvidares
; N.H. Long
; C. Carbone
; P. Mavropoulos
; S. Blügel
; M. Bode
; | | Date: |
11 Feb 2016 | | Abstract: | The particle wave duality sets a fundamental correspondence between optics
and quantum mechanics. Within this framework, the propagation of quasiparticles
can give rise to superposition phenomena which, like for electromagnetic waves,
can be described by the Huygens principle. However, the utilization of this
principle by means of propagation and manipulation of quantum information is
limited by the required coherence in time and space. Here we show that in
topological insulators, which in their pristine form are characterized by
opposite propagation directions for the two quasiparticles spin channels,
mesoscopic focusing of coherent charge density oscillations can be obtained at
large nested segments of constant energy contours by magnetic surface doping.
Our findings provide evidence of strongly anisotropic Dirac fermion-mediated
interactions. Even more remarkably, the validity of our findings goes beyond
topological insulators but applies for systems with spin orbit lifted
degeneracy in general. It demonstrates how spin information can be transmitted
over long distances, allowing the design of experiments and devices based on
coherent quantum effects in this fascinating class of materials. | | Source: | arXiv, 1602.3902 | | Services: | Forum | Review | PDF | Favorites | |
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