Correlated plasmons in the topological insulator Bi2Se3 induced by long-range electron correlations

被引：0
作者：
Thomas J. Whitcher
Mathieu G. Silly
Ming Yang
Pranab Kumar Das
David Peyrot
Xiao Chi
Mahmoud Eddrief
Jisoo Moon
Seongshik Oh
Antonio H. Castro-Neto
Mark B. H. Breese
Andrew T. S. Wee
Fabien Silly
Andrivo Rusydi
机构：
[1] National University of Singapore,Department of Physics
[2] National University of Singapore,Singapore Synchrotron Light Source
[3] National University of Singapore,Centre for Advanced 2D Materials
[4] Synchrotron SOLEIL,Department of Physics & Astronomy, Rutgers
[5] L’orme des merisiers,NUSSNI
[6] Institute of Materials Research and Engineering,NanoCore
[7] A*STAR,undefined
[8] Université Paris-Saclay,undefined
[9] CEA,undefined
[10] CNRS,undefined
[11] SPEC,undefined
[12] TITANS,undefined
[13] Sorbonne Universites,undefined
[14] UPMC Univ. Paris 6,undefined
[15] CNRS,undefined
[16] Institut des NanoSciences de Paris,undefined
[17] The State University of New Jersey,undefined
[18] National University of Singapore,undefined
[19] NUS Graduate School for Integrative Sciences and Engineering,undefined
来源：
NPG Asia Materials | 2020年 / 12卷
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摘要：
Recently, electron correlation has been shown to play an important role in unconventional plasmon generation in highly correlated electron systems. Electrons in topological insulators, on the other hand, are massless and insensitive to nonmagnetic scattering due to their protection by time-reversal symmetry, which makes these materials appealing platforms for hosting exotic plasmonic excitations. Here, using a combination of angle-dependent spectroscopic ellipsometry and angle-resolved photoemission spectroscopy as a function of temperature supported by first-principles calculations, we reveal a new pair of correlated plasmonic excitations at 1.04 and 1.52 eV and a significant Fermi level shift of 0.12 eV accompanied by spectral weight transfer in the topological insulator bismuth selenide (Bi2Se3). Interestingly, such a spectral weight transfer over a broad energy range causes a drastic change in the charge carrier density whereby the contribution of charge carriers in the bulk starts to rival those in the surface states and Bi2Se3 becomes more uniformly conducting. Our results show the importance of electronic correlations in determining the electronic structure and appearance of correlated plasmons in topological insulators and their potential applications in plasmonics.
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