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Anomalous Klein tunneling in two-dimensional black phosphorus heterojunctions
Shu-Gang Chen1, Bin-Yuan Zhang1, Zi-Wei Yang1
1College of Sciences, Northeastern University, Shenyang 110819, China. gwj@mail.neu.edu.cn.
Physical Chemistry Chemical Physics : PCCP
|August 29, 2023
Summary
We studied quantum transport in few-layer black phosphorus (BP) heterojunctions. Anomalous Klein tunneling was observed, showing unique electron transmission behaviors dependent on band gaps and junction types.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Mechanics
Background:
- Few-layer black phosphorus (BP) exhibits unique electronic properties due to its tunable band gap.
- Heterojunctions are crucial for controlling quantum transport phenomena in two-dimensional materials.
Purpose of the Study:
- To investigate the role of band gap inversion in BP heterojunctions on quantum transport.
- To explore the mechanisms behind Klein tunneling and anomalous Klein tunneling in BP.
Main Methods:
- Numerical simulations of quantum transport through armchair and zigzag BP junctions.
- Analysis of electron tunneling probability and transmission spectra under varying band gap configurations.
Main Results:
- In armchair junctions, high transmission (T > 0.5) occurs near normal incidence, with anomalous Klein tunneling observed when band gaps differ.
- Zigzag junctions show transmission over a wider angular range, exhibiting perfect transmission or reflection based on band gap specifics.
- Anomalous Klein tunneling is largely independent of potential barrier dimensions.
Conclusions:
- Band gap engineering in BP heterojunctions offers novel control over quantum transport.
- These findings advance the understanding of Klein and anomalous Klein tunneling in 2D Dirac semimetals.
- Tunable band gap BP presents a promising platform for future electronic devices.
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