QFS2016 Book of Abstracts

Abstracts

P1.10

Manifestation of Fermi edge singularity in co-tunnelling regime

Artem Borin, Eugene Sukhorukov

University of Geneva, Theoretical Physics Department, 24 quai Ernest-Ansermet,

1211 Geneva 4, Switzerland

The Fermi edge singularity (FES) is a prominent manifestation of the Coulomb

interaction. It could be observed in a controllable way by studying the transport

through the quantum dot (QD), which is electrostatically coupled to the leads.

In this paper we study how FES affects higher-order tunnelling processes

(co-tunnelling). To study this problem we use the bosonic description of fermions,

which naturally incorporates the Coulomb interaction. We report multifractional

dependense of the current through QD on the energy of the level on QD and on

the bias between the leads. The universal powers are determined by the scattering

phases due to interaction with charge on the QD.

P1.11

The

He NMR as a probe for geological research

Alakshin Egor(1), Gazizulin Rasul(1), Klochkov Alex(1), Safiullin Kajum(1),

Tagirov Murat(1,2)

1) Kazan Federal University, Institute of Physics, 420008, Kremlevskaya 18

Kazan, Russia

2) Institute of Perspective Research, TAS, 420111, L. Bulachnaya 36a Kazan,

Russia

There are various methods for studying geological samples, but for some of

them traditional methods are not very suitable or not reliable. For instance,

the integral porosity measurements for substrates with low porosity or so-called

closed porous substrates demand new methods to be implemented. The

NMR at temperatures in the range of 1.5K – 4.2K is developing method for

such application. The NMR data of

He in pores of several model samples and

geological specimens is reported, the models of nuclear magnetic relaxation

is proposed and the value of integral porosity estimated. The inverse Laplace

transform of the

He longitudinal magnetization recovery curve has been carried

out and the distribution of the relaxation times T1 has been obtained.