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Michael Hell

Position:    Postdoctoral Researcher

E-mail:    michael.hell@ftf.lth.se
Phone:    +46 (0)46 222 3850
Cell phone:   
Room:    C368
Address:    Professorsgatan 1
22100 Lund
      Sweden

University:    Lund University / Copenhagen University (Niels Bohr Institute)
Division:    Solid State Physics
Research Area(s):    Quantum Physics
Nanoelectronics- & photonics
Interests:    Superconductor-Semiconductor Hybrid Structures

 
michael.hell

Teaching:

No teaching at the moment.

Research:

My work revolves around nanoelectronic devices. Due to their smallness such devices exhibit quantum-physical effects that can endow them with novel functionalities as compared to usual microelectronic devices. I am currently focussing on superconductor-semicondutor hybrid structures.

Supercondcting proximity effect in nanowires and 2DEGs: Superconductors are best known for their ability to carry a DC current without any resistance. In conventional metallic superconductors, this supercurrent is mediated by electrons pairing up to Cooper pairs. These Cooper pairs can leak also into another material in contact with the superconductor, which induces effectively superconductivity also in the nearby material. The superconducting proximity effect is a major experimental focus in nanowires and two-dimensional electron gases (2DEGs), partly with the aim to create Majorana fermions in these semiconducting materials (see below). My work focuses the theoretical modeling of these structures.

Majorana bound states: Majorana bound states are zero-energy modes that may appear, for example, at the ends of nanowires with proximity-induced superconductivity under special conditions. These states are robustly pinned to zero energy even in the presence of local perturbations and - related to this feature - they exhibit a nontrivial exchange statistics. Exchanging two Majoranas changes the wave function by a complex factor that is neither +1 (bosons) or -1 (fermions). Both the robustness and the nontrivial exchange statistics may be advantageous for realizing quantum computation. I am working on the design of experiments for testing these features including the readout of the Majorana states. This work is done in close collaboration with both theory and experimental groups at the Niels Bohr Insititute (Copenhagen University).

For more details about my research interests see also my brief CV.

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