Recent Highlights

Momentum-space signatures of Berry flux monopoles in the Weyl semimetal TaAs


Since the early days of Dirac flux quantization, magnetic monopoles have been sought after as a potential corollary of quantized electric charge. As opposed to magnetic monopoles embedded into the theory of electromagnetism, Weyl semimetals (WSM) exhibit Berry flux monopoles in reciprocal parameter space. As a function of crystal momentum, such monopoles locate at the crossing point of spin-polarized bands forming the Weyl cone. Here, [...]

Nature Communications 12, 3650 (2021)

Related Publications

Physical Review Letters 119, 106401 (2017)

Physical Review Letters 122, 116402 (2019)

Physical Review Letters 124, 176401 (2020)

Physical Review Letters 129, 246404 (2022)

Physical Review B 108, L121107 (2023)

Prediction and Observation of an Antiferromagnetic Topological Insulator


Magnetic topological insulators are narrow-gap semiconductor materials that combine non-trivial band topology and magnetic order. Unlike their nonmagnetic counterparts, magnetic topological insulators may have some of the surfaces gapped, which enables a number of exotic phenomena that have potential applications in spintronics, such as the quantum anomalous Hall effect and chiral Majorana fermions. So far, [...]

Nature 576, 416-422 (2019)

Related Publications

Physical Review B 100, 121104(R) (2019)

Physical Review X 9, 041065 (2019)

Journal of Applied Physics 128, 135303 (2020)

Physical Review Letters 126, 176403 (2021)

Physical Review Research 5, L022019 (2023)

Ultrafast orbital tomography of a pentacene film using time-resolved momentum microscopy at a FEL


Time-resolved momentum microscopy provides insight into the ultrafast interplay between structural and electronic dynamics. Here we extend orbital tomography into the time domain in combination with time-resolved momentum microscopy at a free-electron laser (FEL) to follow transient photoelectron momentum maps of excited states of a bilayer pentacene film on Ag(110). We use optical pump and FEL probe pulses by keeping FEL source [...]

Nature Communications 13, 2741 (2022)

Related Publications

Physical Review Letters 116, 147601 (2016)

Physical Review Letters 117, 183001 (2016)

Physical Review B 98, 195412 (2018)

The European Physical Journal B 92, 80 (2019)

Physical Review B 101, 165421 (2020)