-
Article
Open AccessElectronic inhomogeneity and phase fluctuation in one-unit-cell FeSe films
One-unit-cell FeSe films on SrTiO3 substrates are of great interest owing to significantly enlarged pairing gaps characterized by two coherence peaks at ±10 meV and ±20 meV. In-situ transport measurement is desir...
-
Article
Ambi-chiral anomalous Hall effect in magnetically doped topological insulators
The chirality associated with broken time-reversal symmetry in magnetically doped topological insulators has important implications for the quantum transport phenomena. Here we report anomalous Hall effect stu...
-
Article
Evidence of anisotropic Majorana bound states in 2M-WS2
Searching for Majorana bound states has become an important topic because of its potential applications in topological quantum computing. 2M-phase WS2, a newly synthesized superconductor, not only presents the hi...
-
Article
Magnetic quantum phase transition in Cr-doped Bi2(SexTe1−x)3 driven by the Stark effect
The electric field generated by a gate electrode is exploited to trigger a reversible ferromagnetic–paramagnetic phase transition in a magnetic topological insulator close to a quantum critical point.
-
Article
Open AccessOrigin of charge transfer and enhanced electron–phonon coupling in single unit-cell FeSe films on SrTiO3
Interface charge transfer and electron–phonon coupling have been suggested to play a crucial role in the recently discovered high-temperature superconductivity of single unit-cell FeSe films on SrTiO3. However, t...
-
Article
Open AccessEnhanced electron dephasing in three-dimensional topological insulators
Study of the dephasing in electronic systems is not only important for probing the nature of their ground states, but also crucial to harnessing the quantum coherence for information processing. In contrast to...
-
Article
Topological edge states in a high-temperature superconductor FeSe/SrTiO3(001) film
Superconducting and topological states are two most intriguing quantum phenomena in solid materials. The entanglement of these two states, the topological superconducting state, will give rise to even more exo...
-
Article
Nanoscale superconductivity of γ-Ga islands grown by molecular beam epitaxy
We report on the preparation and superconductivity of metastable γ-Ga islands on Si (111) substrate. The Ga grows in a typical Volmer-Weber mode at a low temperature of 110 K, resulting in formation of Ga nano...
-
Chapter
Synthesis, Structure, and Phase Diagram: Film and STM
Since the discovery of superconductivity of F-doped LaFeAsO in 2008 [1],iron-based superconductors (iron pnictides and iron chalcogides) have become one of the hottest topics in condensed matter physics, which...
-
Article
Dichotomy of the electronic structure and superconductivity between single-layer and double-layer FeSe/SrTiO3 films
The latest discovery of possible high-temperature superconductivity in the single-layer FeSe film grown on a SrTiO3 substrate has generated much attention. Initial work found that, while the single-layer FeSe/SrT...
-
Article
Electrically tuned magnetic order and magnetoresistance in a topological insulator
The interplay between topological protection and broken time reversal symmetry in topological insulators may lead to highly unconventional magnetoresistance behaviour that can find unique applications in magne...
-
Article
Open AccessHigh temperature superconducting FeSe films on SrTiO3 substrates
Interface enhanced superconductivity at two dimensional limit has become one of most intriguing research directions in condensed matter physics. Here, we report the superconducting properties of ultra-thin FeS...
-
Article
Open AccessCrossover between Weak Antilocalization and Weak Localization of Bulk States in Ultrathin Bi2Se3 Films
We report transport studies on the 5 nm thick Bi2Se3 topological insulator films which are grown via molecular beam epitaxy technique. The angle-resolved photoemission spectroscopy data show that the Fermi level ...
-
Article
Open AccessQuantum and Classical Magnetoresistance in Ambipolar Topological Insulator Transistors with Gate-tunable Bulk and Surface Conduction
Weak antilocalization (WAL) and linear magnetoresistance (LMR) are two most commonly observed magnetoresistance (MR) phenomena in topological insulators (TIs) and often attributed to the Dirac topological surf...
-
Article
Open AccessDemonstration of surface transport in a hybrid Bi2Se3/Bi2Te3 heterostructure
In spite of much work on topological insulators (TIs), systematic experiments for TI/TI heterostructures remain absent. We grow a high quality heterostructure containing single quintuple layer (QL) of Bi2Se3 on 1...
-
Article
Fully gapped topological surface states in Bi2Se3 films induced by a d-wave high-temperature superconductor
By growing a topological insulator on top of a high-temperature superconducting substrate it is possible to induce superconductivity in the surface states of the topological insulator. Moreover, the pairing sy...
-
Article
Phase diagram and electronic indication of high-temperature superconductivity at 65 K in single-layer FeSe films
The unconventional superconductivity associated with iron pnictide materials has been the subject of intense interest. Using an annealing procedure to control the charge-carrier concentration, the behaviour of...
-
Article
Anomalous anisotropic magnetoresistance in topological insulator films
Topological insulators are insulating in the bulk but possess spin-momentum locked metallic surface states protected by time-reversal symmetry. The existence of these surface states has been confirmed by angle...
-
Article
Electronic origin of high-temperature superconductivity in single-layer FeSe superconductor
The recent discovery of high-temperature superconductivity in iron-based compounds has attracted much attention. How to further increase the superconducting transition temperature (Tc) and how to understand the s...
-
Article
Phase separation and magnetic order in K-doped iron selenide superconductor
The discovery that potassium-doped iron selenide undergoes phase separation into a defect-free superconducting phase and an iron-vacancy-ordered insulating phase resolves many questions about the unusual behav...
