Light-Tunable Surface State and Hybridization Gap in Magnetic Topological Insulator MnBi8Te13.

  title={Light-Tunable Surface State and Hybridization Gap in Magnetic Topological Insulator MnBi8Te13.},
  author={Haoyuan Zhong and Changhua Bao and Huan Wang and Jiaheng Li and Zichen Yin and Yong Xu and Wenhui Duan and Tianlong Xia and Shuyun Zhou},
  journal={Nano letters},
MnBi8Te13 is an intrinsic ferromagnetic (FM) topological insulator with different complex surface terminations. Resolving the electronic structures of different termination surfaces and manipulation of the electronic state are important. Here, by using micrometer spot time- and angle-resolved photoemission spectroscopy (μ-TrARPES), we resolve the electronic structures and reveal the ultrafast dynamics upon photoexcitation. Photoinduced filling of the surface state hybridization gap is observed… 

Figures from this paper

Van der Waals Engineering of Ultrafast Carrier Dynamics in Magnetic Heterostructures.

Heterostructures composed of the intrinsic magnetic topological insulator MnBi2Te4 and its nonmagnetic counterpart Bi2Te3 host distinct surface electronic band structures depending on the stacking

Ultrasensitive Anisotropic Room-Temperature Terahertz Photodetector Based on an Intrinsic Magnetic Topological Insulator MnBi2Te4.

Terahertz photodetectors based on emergent intrinsic magnetic topological insulators promise excellent performance in terms of highly sensitive, anisotropic and room-temperature ability benefiting

Momentum-inversion symmetry breaking on the Fermi surface of magnetic topological insulators

Magnetic topological insulators (MnBi 2 Te 4 )(Bi 2 Te 3 ) n were anticipated to exhibit magnetic energy gaps while recent spectroscopic studies did not observe them. Thus, magnetism on the surface

Systemic consequences of disorder in magnetically self-organized topological MnBi2Te4/(Bi2Te3) n superlattices

MnBi2Te4/(Bi2Te3) n materials system has recently generated strong interest as a natural platform for the realization of the quantum anomalous Hall (QAH) state. The system is magnetically much better

Exchange bias and interface-related effects in two-dimensional van der Waals magnetic heterostructures: Open questions and perspectives

High-resolution time- and angle-resolved photoemission studies on quantum materials

Upon femtosecond laser excitation in quantum materials, it is possible to study the many-body interactions through the non-equilibrium processes, realize ultrafast electronic phase transitions, and

Single crystal growth of topological semimetals and magnetic topological materials

Topological materials have attracted much attention due to their novel physical properties. These materials can not only serve as a platform for studying the fundamental physics, but also demonstrate

Ultrafast time- and angle-resolved photoemission spectroscopy with widely tunable probe photon energy of 5.3-7.0 eV for investigating dynamics of three-dimensional materials.

Time- and angle-resolved photoemission spectroscopy (TrARPES) is a powerful technique for capturing the ultrafast dynamics of charge carriers and revealing photo-induced phase transitions in quantum

A sample-position-autocorrection system with precision better than 1 µm in angle-resolved photoemission experiments.

We present the development of a high-precision sample-position-autocorrection system for photoemission experiments. A binocular vision method based on image pattern matching calculations was realized



Robust gapless surface state and Rashba-splitting bands upon surface deposition of magnetic Cr on Bi2Se3.

It is shown that surface deposition of Cr atoms on Bi2Se3 does not lead to gap opening of the surface state at the Dirac point, indicating the absence of long-range out-of-plane ferromagnetism down to the measurement temperature of 15 K.

Hybridization-induced gapped and gapless states on the surface of magnetic topological insulators

The layered MnBi2nTe3n+1 family represents the first intrinsic antiferromagnetic topological insulator (AFM TI, protected by a combination symmetry ) ever discovered, providing an ideal platform to

Ultrafast optical excitation of a persistent surface-state population in the topological insulator Bi2Se3.

Using femtosecond time- and angle-resolved photoemission spectroscopy, the nonequilibrium dynamics of the topological insulator Bi2Se3 is investigated, finding an unusually long-lived population of a metallic Dirac surface state with spin texture that may present a channel in which to drive transient spin-polarized currents.

Universal gapless Dirac cone and tunable topological states in (MnBi2Te4)m(Bi2Te3)n heterostructures

The newly discovered magnetic topological insulators (MnBi2Te4)(m)(Bi2Te3)(n) are predicted to be a versatile platform for exploring novel topological states. Here, we report angle-resolved

Manipulating long-lived topological surface photovoltage in bulk-insulating topological insulators Bi2Se3 and Bi2Te3

The appearance of topologically protected spin-momentum locked surface states in topological insulators gives rise to robust room temperature spin currents making them ideal candidates for the

Distinct Topological Surface States on the Two Terminations of MnBi4Te7

The recent discovered intrinsic magnetic topological insulator MnBi2Te4 have been met with unusual success in hosting emergent phenomena such as the quantum anomalous Hall effect and the axion

Exchange bias and quantum anomalous Hall effect in the MnBi2Te4/CrI3 heterostructure.

The MnBi2Te4/CrI3 heterostructure provides a promising platform to realize the electrically tunable zero-field QAH effect by stabilizing surface magnetism, and the high-Chern number QAH state can be achieved by controlling external electric gates.

Trigger of the ubiquitous surface band bending in 3D topological insulators

The main scientific activity in the field of topological insulators (TIs) consists of determining their electronic structure by means of magneto-transport and electron spectroscopy with a view to

Coexistence of Surface Ferromagnetism and a Gapless Topological State in MnBi_{2}Te_{4}.

Using static and time resolved angle-resolved photoemission spectroscopy (ARPES), a significant ARPES intensity change is found together with a gap opening on a Rashba-like conduction band, indicating that the surface magnetism on cleaved MnBi_{2}Te_{4} is the same as its bulk state.