Инд. авторы:	Sumida K., Kakoki M., Reimann J., Nurmamat M., Goto S., Takeda Y., Saitoh Y., Kokh K.A., Tereshchenko O.E., Güdde J., Höfer U., Kimura A.
Заглавие:	Magnetic-impurity-induced modifications to ultrafast carrier dynamics in the ferromagnetic topological insulators sb 2− x v x te 3
Библ. ссылка:	Sumida K., Kakoki M., Reimann J., Nurmamat M., Goto S., Takeda Y., Saitoh Y., Kokh K.A., Tereshchenko O.E., Güdde J., Höfer U., Kimura A. Magnetic-impurity-induced modifications to ultrafast carrier dynamics in the ferromagnetic topological insulators sb 2− x v x te 3 // New Journal of Physics. - 2019. - Vol.21. - Iss. 9. - Art.093006. - ISSN 1367-2630.
Внешние системы:	DOI: 10.1088/1367-2630/ab3ac6; РИНЦ: 42933660;
Реферат:	eng: Quantum anomalous Hall effect(QAHE)is a key phenomenon for low power-consumption deviceapplications owing to its dissipationless spin-polarized and quantized current in the absence of anexternal magneticfield. However, the recorded working temperature of the QAHE is still very low.Here we systematically investigate the magnetic dopants induced modifications from the view pointsof magnetic, structural and electronic properties and the ultrafast carrier dynamics in a series ofV-doped Sb2Te3samples of composition Sb2−xVxTe3withx=0, 0.015 and 0.03. Element specificx-ray magnetic circular dichroism signifies that the ferromagnetism of V-doped Sb2Te3is governed bythep–dhybridization between the host carrier and the magnetic dopant. Time- and angle-resolvedphotoemission spectroscopy excited with mid-infrared pulses has revealed that the V impurityinduced states underlying the topological surface state(TSS)add scattering channels that significantlyshorten the duration of transient surface electrons down to the 100 fs scale. This is in a sharp contrastto the prolonged duration reported for pristine samples though the TSS is located inside the bulkenergy gap of the host in either magnetic or non-magnetic cases. It implies the presence of a mobilitygap in the bulk energy gap region of the host material that would work toward the robust QAHE. Ourfindings shed light on the material design for low-energy-consuming device applications.
Ключевые слова:	scanningtunneling microscopy/spectroscopy; x-ray magnetic circular dichroism; time- and angle-resolved photoemission spectroscopy; topological insulator;
Издано:	2019
Физ. характеристика:	093006
Цитирование:	1. Fu L, Kane C L, Mele E J. 2007. Phys. Rev. Lett. 98106803. 2. Hasan M Z, Kane C L. 2010. Rev. Mod. Phys. 823045. 3. Qi X L, Zhang S C. 2011. Rev. Mod. Phys. 831057. 4. Roth A, Brüne C, Buhmann H, Molenkamp L W, Maciejko J, Qi X-L, Zhang S-C. 2009. Science. 325294. 5. Reimann J. et al. 2018. Nature. 562396. 6. Liu Q, Liu C-X, Xu C, Qi X-L, Zhang S-C. 2009. Phys. Rev. Lett. 102156603. 7. Abanin D A, Pesin D A. 2011. Phys. Rev. Lett. 106136802. 8. Henk J, Flieger M, Maznichenko I V, Mertig I, Ernst A, Eremeev S V, Chulkov E V. 2012. Phys. Rev. Lett. 109076801. 9. Rosenberg G, Franz M. 2012. Phys. Rev. B. 85195119. 10. Efimkin D K, Galitski V. 2014. Phys. Rev. B. 89115431. 11. Dyck J S, Drasar C, Lost'ak P, Uher C. 2005. Phys. Rev. B. 71115214. 12. Zhou Z, Chien Y-J, Uher C. 2006. Phys. Rev. B. 74224418. 13. Hor Y S. et al. 2010. Phys. Rev. B. 81195203. 14. Haazen P P J, Laloe J-B, Nummy T J, Swagten H J M, Jarillo-Herrero P, Heiman D, Moodera J S. 2012. Appl. Phys. Lett. 100082404. 15. Li H. et al. 2012. Appl. Phys. Lett. 101072406. 16. Chang C-Z. et al. 2013. Science. 340167. 17. Chang C-Z. et al. 2015. Nat. Mater. 14473. 18. Kong D. et al. 2011. Nat. Nanotechnol. 6705. 19. Zhang J. et al. 2011. Nat. Commun. 2574. 20. Niu C, Dai Y, Zhu Y, Ma Y, Yu L, Han S, Huang B. 2012. Sci. Rep. 2976. 21. Mogi M, Yoshimi R, Tsukazaki A, Yasuda K, Kozuka Y, Takahashi K S, Kawasaki M, Tokura Y. 2015. Appl. Phys. Lett. 107182401. 22. Ou Y. et al. 2018. Adv. Mater. 301703062. 23. Vergniory M G. et al. 2014. Phys. Rev. B. 89165202. 24. Lee I. et al. 2015. Proc. Natl Acad. Sci. 1121316. 25. Li M, Chang C-Z, Wu L, Tao J, Zhao W, Chan M H W, Moodera J S, Li J, Zhu Y. 2015. Phys. Rev. Lett. 114146802. 26. Ye M. et al. 2015. Nat. Commun. 68913. 27. Sessi P. et al. 2016. Nat. Commun. 712027. 28. Wang W, Chang C-Z, Moodera J S, Wu W. 2016. npj Quantum Mater. 116023. 29. Peixoto T R F. et al. 2016. Phys. Rev. B. 94195140. 30. Duffy L B, Figueroa A I, Gladczuk L, Steinke N-J, Kummer K, van der Laan G, Hesjedal T. 2017. Phys. Rev. B. 95224422. 31. Zhu J-J, Yao D-X, Zhang S-C, Chang K. 2011. Phys. Rev. Lett. 106097201. 32. Dyck J S, Hajek P, Lost'ak P, Uher C. 2002. Phys. Rev. B. 65115212. 33. Zhu J-J, Yao D-X, Zhang S-C, Chang K. 2011. Phys. Rev. Lett. 106097201 34. Kim J, Jhi S-H, MacDonald A H, Wu R. 2017. Phys. Rev. B. 96140410(R). 35. Duffy L B, Figueroa A I, van der Laan G, Hesjedal T. 2017. Phys. Rev. Mater. 1064409. 36. Islam M F. et al. 2018. Phys. Rev. B. 97155429. 37. Wang W, Ou Y, Liu C, Wang Y, He K, Xue Q-K, Wu W. 2018. Nat. Phys. 14791. 38. Zhang W, West D, Lee S H, Qiu Y, Chang C-Z, Moodera J S, Hor Y S, Zhang S, Wu S. 2018. Phys. Rev. B.98115165. 39. Biswas R R, Balatsky A V. 2010. Phys. Rev. B. 81233405. 40. Black-Schaffer A M, Balatsky A V. 2012. Phys. Rev. B. 85121103(R). 41. Black-Schaffer A M, Balatsky A V. 2012. Phys. Rev. B. 86115433. 42. Kokh K A, Makarenko S V, Golyashov V A, Shegai O A, Tereshchenko O E. 2014. Cryst Eng Comm. 16581. 43. Saitoh Y. et al. 2012. J. Synchrotron Radiat. 19388. 44. Kuroda K, Reimann J, Güdde J, Höfer U. 2016. Phys. Rev. Lett. 116076801. 45. Van der Laan G, Thole B T. 1991. Phys. Rev. B. 4313401. 46. Nurmamat M. et al. 2018. Phys. Rev. B. 97115303. 47. Sobota J A, Yang S, Analytis J G, Chen Y L, Fisher I R, Kirchmann P S, Shen Z-X. 2012. Phys. Rev. Lett. 108117403. 48. Reimann J, Güdde J, Kuroda K, Chulkov E V, Höfer U. 2014. Phys. Rev. B. 90081106(R). 49. Zhu S. et al. 2015. Sci. Rep. 513213. 50. Sanchez-Barriga J, Golias E, Varykhalov A, Braun J, Yashina L V, Schumann R, Minar J, Ebert H, Kornilov O, Rader O. 2016. Phys. Rev. B. 93155426. 51. Sumida K. et al. 2017. Sci. Rep. 714080. 52. Niesner D, Otto S, Fauster T, Chulkov E V, Eremeev S V, Tereshchenko O E, Kokh K A. 2014. J. Electron. Spectrosc. Relat. Phenom. 195258. 53. Höfer U, Shumay I L, Reuß C, Thomann U, Wallauer W, Fauster T. 1997. Science. 2771480. 54. Fauster T, Weinelt M, Höfer U. 2007. Prog. Surf. Sci. 82224.