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Updated: Feb 12, 2026
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Radiosynthesis of 1-2-[18F]Fluoroethyl-L-Tryptophan using a One-pot, Two-step Protocol
Published on: September 21, 2021
1/2(e^{2}/h) Conductance Plateau without 1D Chiral Majorana Fermions
1Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
A 1/2(e²/h) conductance plateau in superconductor-integer quantum Hall films may not indicate chiral Majorana fermions. This plateau can arise from the electrical contact itself, not necessarily exotic particles.
Area of Science:
- Condensed Matter Physics
- Quantum Hall Effect
- Superconductivity
Background:
- A 1/2(e²/h) conductance plateau in superconductor-integer quantum Hall (IQH) heterostructures has been experimentally observed.
- This plateau was previously interpreted as evidence for 1D chiral Majorana fermions at the interface.
Purpose of the Study:
- To investigate an alternative mechanism for the observed 1/2(e²/h) conductance plateau.
- To determine if the plateau is a unique signature of chiral Majorana fermions or a more general phenomenon.
Main Methods:
- Theoretical analysis of the electrical contact between an IQH film and a superconducting (SC) film.
- Investigation of the conductance properties under specific temperature and voltage conditions (kBT≪eV).
Main Results:
- The 1/2(e²/h) conductance plateau is a general feature of good electrical contacts between IQH and SC films.
- The presence of this plateau cannot definitively distinguish between the existence or nonexistence of 1D chiral Majorana fermions.
- Contact conductance exhibits a non-Ohmic V² dependence in the low-temperature, high-bias limit for gapped systems.
Conclusions:
- The 1/2(e²/h) conductance plateau is not exclusive evidence for chiral Majorana fermions.
- The electrical contact properties play a crucial role in the observed phenomena.
- Further research is needed to disentangle the contributions of contact physics and exotic quasiparticles.
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