On the electronic and spin-valley coupling of vanadium doped MoSSemonolayers.

Monolayers of MoSwith tunable bandgap and valley positions are highly demanding for their applications in opto-spintronics. Herein, selenium (Se) and vanadium (V) co-doped MoSmonolayers (vanadium doped MoSSe(V-MoSSe)) are developed and showed their variations in the electronic and optical properties with dopant content. Vanadium gets substitutionally (in place of Mo) doped within the MoSlattice while selenium doped in place of sulfur, as shown by a detailed microstructure and spectroscopy analyses.

A low noise cryogen-free scanning tunneling microscope-superconducting magnet system with vacuum sample transfer.

Imaging atomically resolved surfaces and performing spectroscopy of exotic surfaces at cryogenic temperature in the presence of the magnetic field is an engineering challenge. Additionally, performing these measurements in an all-cryogen-free environment compounds the above complexity due to the associated vibration and acoustic noise generated by the running of cryogenic cold heads. We here report successful integration of a cryogen-free scanning tunneling microscope (STM) with a cryogen-free superconducting vector-magnet, connected to an ultra-high vacuum cluster assembly for in situ sample transfer.