2017
DOI: 10.1021/acsphotonics.7b00492
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Probing the Topological Surface State in Bi2Se3Thin Films Using Temperature-Dependent Terahertz Spectroscopy

Abstract: Strong spin-momentum coupling in topological insulators give rise to topological surface states, protected against disorder scattering by time reversal symmetry. The study of these exotic quantum states not only provides an opportunity to explore fundamental phenomenon in condensed matter physics such as the spin hall effect, but also lays the foundation for applications in quantum computing to spintronics. Conventional electrical measurements suffer from substantial bulk interference, making it difficult to c… Show more

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Cited by 30 publications
(29 citation statements)
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“…An undoped 20-nm-thick Sb 2 Te 3 sample was also measured which showed WAL [see Figure S3.2(a) of the Supplementary Information]. The WAL phenomenon demonstrates both the Dirac nature of the surface state carriers as well as the strong spin−orbit interaction in pristine TI materials 27 . On doping the Sb 2 Te 3 film with Cr, the WAL response disappears and instead, an increase in the resistance at low fields corresponding to the MR effect is observed [Figure S3.2(b) of the Supplementary Information].…”
Section: Resultsmentioning
confidence: 99%
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“…An undoped 20-nm-thick Sb 2 Te 3 sample was also measured which showed WAL [see Figure S3.2(a) of the Supplementary Information]. The WAL phenomenon demonstrates both the Dirac nature of the surface state carriers as well as the strong spin−orbit interaction in pristine TI materials 27 . On doping the Sb 2 Te 3 film with Cr, the WAL response disappears and instead, an increase in the resistance at low fields corresponding to the MR effect is observed [Figure S3.2(b) of the Supplementary Information].…”
Section: Resultsmentioning
confidence: 99%
“…The carrier damping rate in TIs (typically~10 −13 s −1 ) lies in the THz frequency range (0.1–2.2 THz), making broadband THz spectroscopy a particularly sensitive probe of TI carrier dynamics. Moreover, the energies typical of collective quasiparticles such as optical phonons, have a fingerprint across the energetic range of the THz radiation (0.4–4 meV) making it a powerful technique to study TIs 27 . The time-resolved THz transmission through all Cr x Sb 2−x Te 3 thin films was measured at 4 K as shown in Fig.…”
Section: Resultsmentioning
confidence: 99%
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“…Thus, it is essential to explore the nonequilibrium properties of TIs under light excitation, such as phonon, carrier, as well as spin dynamics of both the SS and the bulk. The relaxation mechanism of photoexcited hot carriers has been intensively studied by various methods, including the optical pump optical probe (OPOP) [12][13][14][15][16][17][18][19] , optical pump terahertz probe (OPTP) [20][21][22][23] , time-resolved angle-resolved photoemission spectroscopy (Tr-ARPES) [24][25][26][27][28] , Raman spectroscopy [29,30] , second harmonic generation (SHG) [31][32][33] , as well as the time-resolved Kerr rotation (TRKR) [31,34] .…”
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confidence: 99%