ELFT HÍRADÓ

[Zarand Gergely <gzarand AT gmail.com>]

Szia János, 
biztos, hogy ezt akartad kiküldeni? 
Üdv: Gergő 

> On 2020. Sep 23., at 13:56, Janos Asboth <asboth AT phy.bme.hu> wrote:
> 
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> Meghívó
> 
> BME Elméleti Fizika Szeminárium,
> 
> szeptember 18. péntek 10h15,
> online a Microsoft Teamsben, 
> Join Microsoft Teams Meeting
> 
> Dóra Balázs (BME TTK, Elméleti Fizika Tanszék):
> 
> Nuclear magnetic relaxation in Weyl semimetals
> 
> We investigate how the hyperfine coupling influences the NMR spin 
> relaxation time, T1, in Weyl semimetals. Since the density of states in 
> Weyl semimetals varies with the square of the energy around the Weyl point, 
> a naive power counting predicts that the nuclear spin relaxation rate 1/T1 
> would depend on the temperature (T) and the chemical pontential (mu) as 
> 1/T1  ∼ T max(T, mu)^4. We carefully investigate the hyperfine interaction 
> between nuclear spins and Weyl fermions, and find that while its spin part 
> behaves conventionally, its orbital part diverges unusually with the 
> inverse of energy around the Weyl point. Consequently, in contrast with the 
> naive estimate, we find 1/T1 ∼ T max(T, mu)^2 ln(max(T,mu)/ω0), where ω0 is 
> the nuclear Larmor frequency. This allows us to identify an effective 
> hyperfine coupling constant, which is tunable by gating or doping. We also 
> analyze the recent experimental data on the nuclear spin-lattice relaxation 
> rate of the Weyl semimetal TaP. We argue that its non-monotonic temperature 
> dependence is explained by the temperature dependent chemical potential of 
> Weyl fermions.
> 
> Minden érdeklődőt szeretettel várunk.
> 
> Asbóth János
> szemináriumi koordinátor
> 
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