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Universal scheme to generate metal-insulator transition in disordered systems
Ai-Min Guo1, Shi-Jie Xiong, X C Xie
1Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China.
We found a way to create a metal-insulator transition in random binary layer (RBL) systems. Tuning parameters can lead to metallic behavior by creating a band of extended states, regardless of disorder strength.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Disordered Systems
Background:
- The random binary layer (RBL) model involves layers with two types randomly assigned along one direction.
- Understanding metal-insulator transitions is crucial for designing novel electronic materials.
Purpose of the Study:
- To propose and investigate a scheme for inducing a metal-insulator transition in RBL systems.
- To explore the conditions and mechanisms governing this transition.
Main Methods:
- Utilized a tight-binding Hamiltonian to model the system.
- Employed the transfer-matrix method for calculating localization length.
- Conducted both analytical and numerical analyses.
Main Results:
- Identified conditions for the emergence of extended states in quasi-one-dimensional RBLs.
- Demonstrated that tuning model parameters can lead to metallic behavior.
- Discovered that extended states are independent of diagonal and off-diagonal disorder.
Conclusions:
- A metal-insulator transition can be achieved in RBLs by creating an ordered subband.
- The findings are generalizable to higher-dimensional disordered systems.
- Potential experimental realization in Bose-Einstein condensates.
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