Volume 106, Number 3, May 2014
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||13 May 2014|
Internal chiral spin structure of topological-insulator/metal superlattices
1 College of Science, Nanjing University of Science and Technology - Nanjing 210094, China
2 Department of Physics, University of Illinois at Urbana-Champaign - 1110 West Green Street, Urbana, IL 61801-3080, USA
3 Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign 104 South Goodwin Avenue, Urbana, IL 61801-2902, USA
4 Synchrotron Radiation Center, University of Wisconsin-Madison - 3731 Schneider Drive, Stoughton, WI 53589-3097, USA
Received: 30 October 2013
Accepted: 21 April 2014
The electronic structure of a superlattice, made of a topological insulator (Bi2Se3) and a normal metal (Ca/Sr alloy), has been studied by first-principle calculations. Even though spatial inversion and time-reversal symmetries require all electronic states in the system be spin degenerate spin separation in real space is permitted. The system forms a nontrivial three-dimensional spin structure by self-organization into a dense periodic stack of spin-carrying electron sheets of alternating chirality imbedded in the subsurface regions of the topological insulator layers. This highly anisotropic spin configuration makes the system a promising candidate for field-effect spin transducers and transistors.
PACS: 74.78.Fk – Multilayers, superlattices, heterostructures / 73.20.-r – Electron states at surfaces and interfaces / 71.70.Ej – Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect
© EPLA, 2014
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