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Remote Mesoscopic Signatures of Induced Magnetic Texture in Graphene
N Arabchigavkani1, R Somphonsane2, H Ramamoorthy3
1Department of Physics, University at Buffalo, the State University of New York, Buffalo, New York 14260, USA.
Physical Review Letters
|March 12, 2021
Summary
Giant conductance fluctuations in graphene reveal a breakdown of universality in mesoscopic physics. Remote phenomena can overwhelm local effects in phase-coherent conductors, challenging established theories.
Area of Science:
- Condensed matter physics
- Mesoscopic physics
- Quantum transport
Background:
- Mesoscopic conductance fluctuations are typically universal, independent of specific system details in phase-coherent conductors.
- Universality in mesoscopic physics assumes local phenomena dominate transport characteristics.
Purpose of the Study:
- To investigate the breakdown of universality in mesoscopic conductance fluctuations.
- To explore the influence of remote phenomena on transport in graphene.
Main Methods:
- Experiments conducted in a graphene-based interaction-detection geometry.
- Artificial magnetic texture induced in graphene using a micromagnet.
- Conduction probed at a distance from the induced magnetic texture.
Main Results:
- Observed giant conductance fluctuations with amplitudes significantly exceeding the universal limit (e^2/h).
- Demonstrated a pronounced breakdown of universality in mesoscopic transport.
- Showcased the significant influence of remote factors on conductance.
Conclusions:
- Local considerations can be overwhelmed by remote signatures in phase-coherent conductors.
- The interplay of local and remote phenomena leads to a violation of mesoscopic universality.
- Findings challenge fundamental tenets of mesoscopic physics.
