Skip to Content.
Sympa Menu

fizinfo - [Fizinfo] Niccolo Traverso Ziani eloadasa a BME-n

fizinfo AT lists.kfki.hu

Subject: ELFT HÍRADÓ

List archive

[Fizinfo] Niccolo Traverso Ziani eloadasa a BME-n


Chronological Thread 
  • From: Edina Szirmai <eszirmai AT phy.bme.hu>
  • To: Fizinfo AT lists.kfki.hu
  • Subject: [Fizinfo] Niccolo Traverso Ziani eloadasa a BME-n
  • Date: Thu, 8 Oct 2015 20:15:47 +0200
  • Authentication-results: smtp0.kfki.hu (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com

MEGHÍVÓ

az BME-MTA "Egzotikus Kvantum Fázisok"
kutatócsoport következő szemináriumára:


Niccolo Traverso Ziani
(University of Würzburg, Germany)

Wigner oscillations and fractional Wigner oscillations
in Luttinger liquids

Kivonat:
In finite electronic systems, when electron­electron interactions dominate
over kinetic energy, electrons tend to form regular lattices, called Wigner
molecules. While the study of the Wigner molecule in three and two spatial
dimensions is most often carried out numerically, in one dimension the
Luttinger liquid theory allows for analytical results. In one dimension,
when interaction strength is increased from the noninteracting regime, a
crossover between finite size Friedel oscillations (with wavevector 2k_F)
and Wigner oscillations (with wavevector 4k_F) is found in the average
density [1]. Moreover, in a range of intermediate interactions, increasing
temperature favours Wigner oscillations over Friedel ones [2]. Importantly,
for strong interactions, the Wigner molecule becomes an almost classical
state and any dependence on the spin degree of freedom is lost. This
behaviour is antithetical to the concept of spin­momentum locking
characterizing the helical edges of two­dimensional topological insulators
(helical Luttinger liquids) [3]. The compromise between strong interactions
and spin­momentum locking leads, in helical systems, to a Wigner
oscillation of fermions with fractional charge e/2 [4]. This fractional
oscillation is also characterized by strongly anisotropic spin spin
correlations.

[1] I. Safi and H. J. Shulz, Phys. Rev. B 59, 3040 (1999).
[2] N. Traverso Ziani, F. Cavaliere, and M. Sassetti, New J. Phys. 15,
063002 (2013).
[3] C. Wu, B. ,A. Bernevig, and S.­C. Zhang, Phys. Rev. Lett. 96, 105401
(2006).
[4] N. Traverso Ziani, F. Crépin, and B. Trauzettel, arXiv:1504.07143
(2015).


Az előadás helye: BME F III. épület, mfsz, szemináriumi szoba.
Ideje: 2015. október 12. hétfő, 14:15.


Minden érdeklődőt szeretettel várunk!

Szirmai Edina



--
Edina Szirmai
Department of Theoretical Physics,
Budapest University of Technology and Economics
Budafoki ut 8.
Budapest, Hungary
Tel:(+36-1) 463-4107
Fax:(+36-1) 463-3567
www.phy.bme.hu/~eszirmai


  • [Fizinfo] Niccolo Traverso Ziani eloadasa a BME-n, Edina Szirmai, 10/08/2015

Archive powered by MHonArc 2.6.19+.

Top of Page