Measurement of Intrinsic Dirac Fermion Cooling on the Surface of the Topological Insulator Bi2Se3 Using Time- Resolved and Angle-Resolved Photoemission
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Measurement of intrinsic dirac fermion cooling on the surface of the topological insulator Bi2Se3 using time-resolved and angle-resolved photoemission spectroscopy.
We perform time- and angle-resolved photoemission spectroscopy of a prototypical topological insulator (TI) Bi(2)Se(3) to study the ultrafast dynamics of surface and bulk electrons after photoexcitation. By analyzing the evolution of surface states and bulk band spectra, we obtain their electronic temperature and chemical potential relaxation dynamics separately. These dynamics reveal strong ph...
متن کاملAuxiliary Material for EPAPS: Measurement of intrinsic Dirac fermion cooling on the surface of a topological insulator Bi2Se3 using time- and angle-resolved photoemission spectroscopy
Two types of single crystal Bi2Se3 samples are prepared which allow us to span the surface doping range investigated in the main text. For the high doping level samples where ED = 0.28 eV below EF , stoichiometric mixture of Bi and Se are used. And for the low doping level samples where ED = 0.06 eV, the initial mixture of Bi:Se = 2:4.06 are used. ED in between these two levels are tuned throug...
متن کاملUltrafast optical excitation of a persistent surface-state population in the topological insulator Bi2Se3.
Using femtosecond time- and angle-resolved photoemission spectroscopy, we investigated the nonequilibrium dynamics of the topological insulator Bi2Se3. We studied p-type Bi2Se3, in which the metallic Dirac surface state and bulk conduction bands are unoccupied. Optical excitation leads to a metastable population at the bulk conduction band edge, which feeds a nonequilibrium population of the su...
متن کاملMassive Dirac fermion on the surface of a magnetically doped topological insulator.
In addition to a bulk energy gap, topological insulators accommodate a conducting, linearly dispersed Dirac surface state. This state is predicted to become massive if time reversal symmetry is broken, and to become insulating if the Fermi energy is positioned inside both the surface and bulk gaps. We introduced magnetic dopants into the three-dimensional topological insulator dibismuth trisele...
متن کاملHexagonally deformed Fermi surface of the 3D topological insulator Bi2Se3.
A hexagonal deformation of the Fermi surface of Bi2Se3 has been for the first time observed by angle-resolved photoemission spectroscopy. This is in contrast to the general belief that Bi2Se3 possesses an ideal Dirac cone. The hexagonal shape is found to disappear near the Dirac node, which would protect the surface state electrons from backscattering. It is also demonstrated that the Fermi ene...
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تاریخ انتشار 2012