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Band Dispersion and Career Mobility 
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#1
Jun2914, 01:40 AM

P: 2

how the dispersion relation(i.e. Ek relation) affects carrier mobility in metals or semimetals?



#2
Jun2914, 09:46 AM

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PF Gold
P: 29,243

For example, the electron mobility can be written, in the simplest form, as [tex]\mu = e\tau/m^*[/tex] where μ is the mobility, τ is the scattering time, e is the charge, and m* is the effective mass. Now, look up the relationship between the effective mass and the band dispersion, and you have your answer. Zz. 


#3
Jul114, 08:56 PM

P: 2

what if the charge carriers are massless as in case of graphene which is a single atom thick sheet?



#4
Jul214, 02:35 AM

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P: 3,633

Band Dispersion and Career Mobility
The book by Ashcroft and Mermin discusses all this in detail. 


#5
Sep1714, 04:56 AM

P: 35

I can derive the [itex]m^*[/itex] from band structure data ( through curvefitting and then take a derivative with respect to kpoint),but I know little information for the scattering time ;how to estimate [itex]\tau[/itex] for the systems (for example, BN sheet,or phosphorus) ? There is also another formula ,i.e., [tex]\upsilon_{d}=μE[/tex] it seems not cowork with those data using first princple softwares. 


#6
Sep1714, 11:40 AM

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