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Switchable Weyl nodes in topological Kagome ferromagnet Fe3Sn2
M. Yao, H. Lee, N. Xu +7
The control of topological quantum materials is the prerequisite for novel devices exploiting these materials. Here we propose that the room temperature ferromagnet Fe3Sn2, whose f…
Evidence of Coulomb interaction induced Lifshitz transition and robust hybrid Weyl semimetal in Td MoTe2
N. Xu, Z. W. Wang, A. Magrez +13
Using soft x-ray angle-resolved photoemission spectroscopy we probed the bulk electronic structure of Td MoTe2. We found that on-site Coulomb interaction leads to a Lifshitz transi…
Spin- and angle-resolved photoemission on the topological Kondo Insulator candidate: SmB6
N. Xu, H. Ding, M. Shi
Topological Kondo insulators are a new class of topological insulators in which metallic surface states protected by topological invariants reside in the bulk band gap at low tempe…
NaFeCuAs: A pnictide insulating phase induced by on-site Coulomb interaction
C. E. Matt, N. Xu, B. Q. Lv +13
In the studies of iron-pnictides, a key question is whether their bad-metal state from which the superconductivity emerges lies in close proximity with a magnetically ordered insul…
Tuning the metal-insulator transition in NdNiO3 heterostructures via Fermi surface instability and spin-fluctuations
R. S. Dhaka, Tanmoy Das, N. C. Plumb +11
We employed {\it in-situ} pulsed laser deposition (PLD) and angle-resolved photoemission spectroscopy (ARPES) to investigate the mechanism of the metal-insulator transition (MIT) i…
Exotic Kondo crossover in a wide temperature region in the topological Kondo insulator SmB6 revealed by high-resolution ARPES
N. Xu, C. E. Matt, E. Pomjakushina +12
Temperature dependence of the electronic structure of SmB6 is studied by high-resolution ARPES down to 1 K. We demonstrate that there is no essential difference for the dispersions…
Dynamical correlations and screened exchange on the experimental bench: spectral properties of the cobalt pnictide BaCo2As2
Ambroise van Roekeghem, Thomas Ayral, Jan M. Tomczak +7
Understanding the Fermi surface and low-energy excitations of iron or cobalt pnictides is crucial for assessing electronic instabilities such as magnetic or superconducting states.…
Direct observation of the spin texture in strongly correlated SmB6 as evidence of the topological Kondo insulator
N. Xu, P. K. Biswas, J. H. Dil +18
The concept of a topological Kondo insulator (TKI) has been brought forward as a new class of topological insulators in which non-trivial surface states reside in the bulk Kondo ba…
Surface vs bulk electronic structures of a moderately correlated topological insulator YbB6 revealed by ARPES
N. Xu, C. E. Matt, E. Pomjakushina +14
Systematic angle-resolved photoemission spectroscopy (ARPES) experiments have been carried out to investigate the bulk and (100) surface electronic structures of a topological mixe…
Surface and Bulk Electronic Structure of the Strongly Correlated System SmB and Implications for a Topological Kondo Insulator
N. Xu, X. Shi, P. K. Biswas +13
Recent theoretical calculations and experimental results suggest that the strongly correlated material SmB may be a realization of a topological Kondo insulator. We have perf…