Spin texture of topological crystalline insulator surface states in Pb1-xSnxSe 

Piotr Dziawa 1Bastian M. Wojek 3Ryszard Buczko 1Shiva Safaei 1B. J. Kowalski 1Magnus H. Berntsen 3Thiagarajan Balasubramanian 2Mats Leandersson 2Andrzej Szczerbakow 1Perla Kacman 1Tomasz Story 1Oscar Tjernberg 3

1. Polish Academy of Sciences, Institute of Physics, al. Lotników 32/46, Warszawa 02-668, Poland
2. Lund University, MAX-lab, Lund SE-221 00, Sweden
3. Royal Institute of Technology (KTH), Brinellvagen 23, 2tr., Stockholm SE10044, Sweden


In recent years theoretical predictions [1-3] as well as experimental confirmations bring on new class of materials called topological insulators (TI). These materials are characterized by inverted electronic bands with an odd number of Dirac cones of metallic surface states with specific spin texture. Both spin-orbit coupling and time reversal symmetry protect spins against local non-magnetic perturbations and guarantee preservation of spin features of surface states. Lately the novel class – topological crystalline insulators (TCI) – was anticipated theoretically [4-5]. The exploration of TCIs has been directed onto SnTe, lead salts and related alloys from IV-VI group of narrow gap semiconductors, which was shortly confirmed experimentally [6-8]. Differently to TIs, in these materials the crucial role plays crystalline mirror symmetry originating from the rock-salt crystal structure.

In contrast to SnTe the ternary compounds provide the ability to manipulate both spin-orbit interaction and band gap. The increasing tin content in Pb1-xSnxSe and Pb1-xSnxTe leads to closing the bulk band gap at some specific composition xc. For higher values of x the band structure undergoes inversion, band gap opens and distinct Dirac-like surface states appear [6]. The same effect can be achieved by changing the temperature, i.e. high temperatures correspond to topologically trivial state while at low temperatures TCI state with inverted bands is established [6].

To check spin phenomena in Pb1-xSnxSe we used angle-resolved as well as spin-resolved photoelectron spectroscopy at the MAX III synchrotron at MAX-lab, Lund University (Sweden). We studied (001) surface of n-type monocrystalline Pb0.73Sn0.27Se grown by self-selected vapour method. From the evolution of the band gap the temperature of transition into closed gap state for this crystal composition was estimated to be approximately 250 K. The formation of metallic surface states revealed by the birth of Dirac-cones was clearly observed at low temperatures TCI state. The spin polarization was investigated in both trivial (at T=300 K) and TCI (at T=80 K) states at 2D Brillouin zone in vicinity of X (the projection of the L(111) points in the bulk crystal onto the (001) surface). The experimental results revealed that both trivial and TCI states posses spin polarization with the chiral spin textures. These findings are consistent with our using tight-binding calculations for high-symmetry directions of (001) surface Brillouin zone.


[1] C.L. Kane and E.J. Mele, Phys. Rev. Lett. 95 (2005) 146802.

[2] L. Fu and C.L. Kane, Phys. Rev. B 76 (2007) 045302.

[3] M. Hasan and C.L. Kane, Rev. Mod. Phys. 82 (2010) 3045.

[4] L. Fu, Phys. Rev. Lett. 106 (2011) 106802.

[5] T.H. Hsieh et al., Nature Communications 3 (2012) 982.

[6] P. Dziawa et al., Nat. Mater. 11 (2012) 1023.

[7] S.-Y. Xu et al., Nat. Commun. 3 (2012) 1192.

[8] Y. Tanaka et al., Nat. Phys. 8 (2012) 800.

Legal notice
  • Legal notice:

    Copyright (c) Pielaszek Research, all rights reserved.
    The above materials, including auxiliary resources, are subject to Publisher's copyright and the Author(s) intellectual rights. Without limiting Author(s) rights under respective Copyright Transfer Agreement, no part of the above documents may be reproduced without the express written permission of Pielaszek Research, the Publisher. Express permission from the Author(s) is required to use the above materials for academic purposes, such as lectures or scientific presentations.
    In every case, proper references including Author(s) name(s) and URL of this webpage: http://science24.com/paper/29841 must be provided.


Related papers
  1. X-ray diffraction studies of (Pb,Cd)Te solid solution – possible new material for thermoelectric applications
  2. The influence of growth atmosphere on the self-selection of the grains during ZnO crystal growth
  3. Structure-Dependent Ferromagnetism in Mn-Doped III-V Nanowires
  4. Magnetic anisotropy in ferromagnetic (Ge,Mn)Te epitaxial layers with varying Mn content
  5. Structural, morphological and optical properties of ZnAl2O4 nanoparticles co-doped with Er3+and Yb3+ prepared by combustion aerosol synthesis.
  6. Low-temperature expansion of metastable Pb1-xCdxTe solid solution
  7. X-ray photoemission from CdTe/PbTe/CdTe nanostructure in normal and grazing-incidence modes
  8. Ferromagnetic transition induced by re-crystallization of amorphous (Ge,Mn)Te layers
  9. Pressure dependence of lattice parameter of Gadolinium Gallium Garnet crystals
  10. ZnO thin films for organic/inorganic heterojunctions
  11. Mn 3d electrons in the valence band of Mn/Ge0.9Mn0.1Te- a resonant photoemission study
  12. Wide band-gap II-VI semiconductors for optoelectronic applications
  13. Influence of high temperature annealing on the local atomic structure around Mn atoms and magnetic properties of (Ga,Mn)As layers
  14. Effect of annealing on electrical properties of low temperature ZnO films
  15. Ferromagnetism in ZnO:Mn thin films deposited by PEMOCVD
  16. Ferromagnetic (Eu,Gd)Te/PbTe semiconductor heterostructures
  17. Magnetization study of interlayer exchange in semiconductor EuS-PbS ferromagnetic wedge multilayers
  18. Structural and optical characterization of epitaxial layers of CdTe/PbTe grown on BaF2 (111) substrates
  19. Growth and characterization of thin films of ZnO by Atomic Layer Epitaxy
  20. Differential Reflectivity and Photoemission study of ZnTe and CdTe(110) surface

Presentation: Poster at 17th International Conference on Crystal Growth and Epitaxy - ICCGE-17, Topical Session 2, by Piotr Dziawa
See On-line Journal of 17th International Conference on Crystal Growth and Epitaxy - ICCGE-17

Submitted: 2013-04-19 15:32
Revised:   2013-04-19 15:38
Web science24.com
© 1998-2021 pielaszek research, all rights reserved Powered by the Conference Engine