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Fakultät Physik
Instrumentation

System for near ambient pressure x-ray photoelectron spectroscopy (NAP-XPS)

The system (provided by Specs GmbH) is equipped with a PHOIBOS 150 analyzer, a monochromatized small spot x-ray source and flood gun. In addition, standard tools for sample preparation and characterization are available.

NAP-XPS © Valentin Mischke ​/​ TU Dortmund
System for near ambient pressure x-ray photoelectron spectroscopy.

 Using XPS in combination with angle-resolved photoemission spectroscopy (ARPES) and first-principles calculations, we uncovered a universal mechanism that governs how charge doping modifies the electronic structure of two-dimensional antiferromagnets. XPS revealed a d-shell-selective doping mechanism: while electronically stable compounds such as MnPS₃ remain largely unaffected, materials with less stable d-shell configurations—most prominently CoPS₃—undergo a profound electronic reorganization, including a transition from semiconductor to metal. These results establish d-shell engineering as a powerful design principle for tailoring the electronic and magnetic properties of van der Waals quantum materials for future spintronic and quantum technologies. 

Reference:
 J. E. Nitschke et al., Electronic Structure Reorganization in MPS₃ via d-Shell-Selective Alkali Metal Doping, Advanced Science (2026).