The exciton, a bound state of an electron and a hole, is a fundamental quasiparticle induced
by coherent light–matter interactions in semiconductors. When the electrons and holes are …

Topological insulators (TIs) host robust edge or surface states protected by time-reversal
symmetry (TRS), which makes them prime candidates for applications in spintronic devices …

We present a theoretical analysis showing that layered topological insulators, for example,
Bi 2 Se 3 are optically hyperbolic materials in the range of terahertz (THz) frequencies. As …

In three-dimensional (3D) topological materials, tuning of the bulk chemical potential is of
crucial importance for observing their topological properties; for example, Weyl semimetals …

We show that in manganese-doped topological insulator bismuth telluride layers, Mn atoms
are incorporated predominantly as interstitials in the van der Waals gaps between the …

We demonstrate that the terahertz/infrared radiation induced photogalvanic effect, which is
sensitive to the surface symmetry and scattering details, can be applied to study the high …

Asymmetric Fano resonance arises from quantum interference between discrete and
continuum states. The characteristic asymmetry has attracted strong interests in …

We have investigated the optical properties of thin films of topological insulators Bi 2 Te 3, Bi
2 Se 3, and their alloys Bi 2 (Te 1− x Se x) 3 on BaF 2 substrates by a combination of …

In two-dimensional topological insulators, such as inverted HgTe/CdTe quantum wells,
helical quantum spin Hall (QSH) states persist even at finite magnetic fields below a critical …

We report nanoscale-resolved optical investigations on the local material properties of
Sb2Te3 hexagonal platelets grown by solvothermal synthesis. Using mid-infrared near-field …