Zobrazeno 1 - 10
of 2 765
pro vyhledávání: '"Nattermann, T."'
Autor:
Borisenko, I. V., Divinskiy, B., Demidov, V. E., Li, G., Nattermann, T., Pokrovsky, V. L., Demokritov, S. O.
Publikováno v:
Nature Commun. 11, 1691 (2020)
Bose-Einstein condensation of quasi-equilibrium magnons is one of few macroscopic quantum phenomena observed at room temperature. Since its discovery, it became an object of intense research, which led to the observation of many exciting phenomena su
Externí odkaz:
http://arxiv.org/abs/1910.06013
Autor:
Nattermann, T., Pokrovsky, V. L.
Helical magnets which violated space inversion symmetry have rather peculiar topological defects. In isotropic helical magnets with exchange and Dzyaloshinskii-Moriya interactions there are only three types of linear defects: $\pm\pi$ and $2\pi$-disc
Externí odkaz:
http://arxiv.org/abs/1810.00626
Publikováno v:
Physical Review Letters, Vol. 112, 157201 (2014)
The phase diagram of the frustrated 2D classical and 1D quantum XY models is calculated analytically. Four transitions are found: the vortex unbinding transitions triggered by strong fluctuations occur above and below the chiral transition temperatur
Externí odkaz:
http://arxiv.org/abs/1308.0823
The pre-melting of high vortex density planes observed recently in layered superconductors in tilted magnetic field is explained theoretically. Based on the structural information of the crossing lattices of pancake and Josephson vortices the effecti
Externí odkaz:
http://arxiv.org/abs/1302.3171
Publikováno v:
Phys.Rev.Lett. 105 267001 (2010)
The zero temperature phase diagram of Cooper pairs exposed to disorder and magnetic field is found to exhibit four distinct phases: a Bose and a Fermi insulating, a metallic and a superconducting phase, respectively. The results explain the giant neg
Externí odkaz:
http://arxiv.org/abs/1001.5431
Publikováno v:
Phys. Rev B 80, 104515 (2009)
Zero temperature properties of a dilute weakly interacting $d$-dimensional Bose gas in a random potential are studied. We calculate geometrical and energetic characteristics of the localized state of a gas confined in a large box or in a harmonic tra
Externí odkaz:
http://arxiv.org/abs/0811.1269
Publikováno v:
Europhysics Letters {\bf 85}, 30002 (2009)
Very diluted Bose gas placed into a disordered environment falls into a fragmented localized state. At some critical density the repulsion between particles overcomes the disorder. The gas transits into a coherent superfluid state. In this article th
Externí odkaz:
http://arxiv.org/abs/0808.2565
Autor:
Malinin, S., Nattermann, T.
Publikováno v:
International Journal of Modern Physics 21, 4164 (2007)
The tunnel current of a Luttinger liquid with a finite density of strong impurities is calculated using an instanton approach. For very low temperatures $T$ or electric fields $E$ the (nonlinear) conductivity is of variable range hopping (VRH) type a
Externí odkaz:
http://arxiv.org/abs/0807.0194
Autor:
Nattermann, T., Pokrovsky, V. L.
Publikováno v:
Phys. Rev. Lett. 100, 060402 (2008)
A Bose-Einstein condensate in an external potential consisting of a superposition of a harmonic and a random potential is considered theoretically. From a semi-quantitative analysis we find the size, shape and excitation energy as a function of the d
Externí odkaz:
http://arxiv.org/abs/0707.4444
Publikováno v:
Phys. Rev. Lett. 97, 096601 (2006)
A long one-dimensional wire with a finite density of strong random impurities is modelled as a chain of weakly coupled quantum dots. At low temperature T and applied voltage V its resistance is limited by "breaks": randomly occuring clusters of quant
Externí odkaz:
http://arxiv.org/abs/cond-mat/0602008