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Related Experiment Video

Updated: Feb 5, 2026

Determining Membrane Protein Topology Using Fluorescence Protease Protection FPP

Determining Membrane Protein Topology Using Fluorescence Protease Protection FPP

Published on: April 20, 2015

Symmetry-Protected Topological Metals.

Xuzhe Ying¹, Alex Kamenev^1,2

¹School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA.

Physical Review Letters

|September 8, 2018

Summary

This summary is machine-generated.

Topological quantum phase transitions can occur between gapless metallic states, not just gapped ones. These transitions feature a distinct jump in transport properties, protected by underlying symmetries.

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Area of Science:

Condensed matter physics
Quantum materials
Topological phases

Background:

Topological quantum phase transitions (TQPTs) are typically studied in systems with gapped electronic spectra.
Understanding TQPTs in gapless systems is crucial for exploring novel quantum phenomena.

Purpose of the Study:

To demonstrate that TQPTs can exist between two gapless metallic states.
To characterize the nature of these transitions and their protective mechanisms.

Main Methods:

Theoretical modeling of a 2D p+ip superconductor with applied supercurrent.
Analysis of transport coefficients and symmetry protection.

Main Results:

TQPTs are shown to occur between gapless metallic states with extended Fermi surfaces.
A discontinuous, non-quantized jump in an off-diagonal transport coefficient characterizes the transition.
Particle-hole symmetry protects the sharpness of the transition.

Conclusions:

The concept of TQPTs extends beyond gapped systems to include gapless metallic states.
Symmetry protection is key to the sharpness of these transitions.
The findings offer new avenues for exploring topological phenomena in condensed matter systems.