Local density of states (LDOS) is

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SUMMARY

Local Density of States (LDOS) refers to the density of electronic states at a specific location in space, providing localized information that differs from the Projected Density of States (PDOS), which encompasses all possible states. LDOS is crucial in scanning tunneling microscopy (STM), where it influences current flow based on the position of measurement. A smaller isolevel results in denser LDOS because it captures more localized states, enhancing the resolution of electronic properties. For a comprehensive understanding, refer to "Quantum Transport" by Datta (2005).

PREREQUISITES
  • Understanding of quantum mechanics principles
  • Familiarity with electronic properties of materials
  • Knowledge of scanning tunneling microscopy (STM) techniques
  • Basic concepts of density of states in solid-state physics
NEXT STEPS
  • Study the differences between Local Density of States (LDOS) and Projected Density of States (PDOS)
  • Explore the principles of scanning tunneling microscopy (STM) and its applications
  • Read "Quantum Transport" by Datta (2005) for in-depth theoretical insights
  • Investigate the effects of isolevel adjustments on LDOS measurements
USEFUL FOR

Researchers in condensed matter physics, materials scientists, and anyone involved in the study of electronic properties at the atomic level will benefit from this discussion.

saray1360
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Hi,

I would like to know what local density of states (LDOS) is and what differences it has with projected density of states?

Also, when we choose a smaller isolevel we have a denser local densities of states, why?

Regrds,
 
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What is PDOS? Projected density of states? This is the first time I am hearing about it.

LDOS is simply the density of states at a given location in space. Normally Density of Space calculations include all possible states, and LDOS gives local information.

All those STM images of surfaces showing almost individual atoms are based on that. STM measures LDOS - so you get different current flow depending on your position.

For a better description see:

Datta, 2005, Quantum Transport
 

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