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[Fizinfo] Okvátovity Zoltán előadása a BME-n


Chronological Thread 
  • From: Andras Palyi <andraspalyi AT caesar.elte.hu>
  • To: FIZINFO AT lists.kfki.hu
  • Subject: [Fizinfo] Okvátovity Zoltán előadása a BME-n
  • Date: Fri, 2 Dec 2016 09:22:18 +0100

A BME-MTA Egzotikus Kvantumfázisok csoport következő szemináriuma:

Okvátovity Zoltán (BME)
Anomalous hyperfine coupling and nuclear magnetic relaxation in Weyl
semimetals

2016. december 6., kedd, 14:15
BME Elméleti Fizika Tanszék szemináriumi szobája (F épület, 3. lépcsőház,
magasföldszint)

Kivonat:
“The electron-nuclear hyperfine interaction shows up in a variety of
phenomena including e.g. NMR studies of correlated states and spin
decoherence effects in quantum dots. Here we focus on the hyperfine coupling
and 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 a 1/(T1*T) ~ E^4 scaling with E
the maximum of temperature (T) and chemical potential. By carefully
investigating the hyperfine interaction between nuclear spins and Weyl
fermions, we find that while its spin part behaves conventionally, its
orbital part diverges unusually with the inverse of energy around the Weyl
point. Consequently, the nuclear spin relaxation rate scales in a graphene
like manner as 1/(T1*T) ~ E^2 ln(E/ω0) with ω0 the nuclear Larmor frequency.
This allows us to identify an effective hyperfine coupling constant, which is
tunable by gating or doping, which is relevant for decoherence effect in
spintronics devices and double quantum dots where hyperfine coupling is the
dominant source of spin-blockade lifting.”

Minden érdeklődőt szeretettel várunk.

A szemináriumsorozat programja:
http://exotic.phy.bme.hu/seminars.html

Üdvözlettel,
Pályi András



  • [Fizinfo] Okvátovity Zoltán előadása a BME-n, Andras Palyi, 12/02/2016

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