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## Квантовые флуктуации параметра порядка в квазиодномерных сверхпроводящих каналах

Ufa:
Уфа: НИЦ «Аэтерна», 2020, 2020.

In press

Quantum fluctuations of the order parameter in quasi-1D-superconductors

Priority areas:
engineering science

Language:
Russian

Латышев А. М., Semenov A. G., Zaikin A., Beilstein Journal of Nanotechnology 2020 Vol. 11 P. 1402-1408

We investigate superconductor–insulator quantum phase transitions in ultrathin capacitively coupled superconducting nanowires with proliferating quantum phase slips. We derive a set of coupled Berezinskii–Kosterlitz–Thouless-like renormalization group equations demonstrating that interaction between quantum phase slips in one of the wires gets modified due to the effect of plasma modes propagating in another wire. As a result, ...

Added: October 8, 2020

Радкевич А., Semenov A. G., Zaikin A., Physical Review B: Condensed Matter and Materials Physics 2019 Vol. 100 No. 014520 P. 014520-1-014520-7

The quantum behavior of superconducting nanowires may essentially depend on the employed experimental setup. Here we investigate a setup that enables passing equilibrium supercurrent across an arbitrary segment of the wire without restricting fluctuations of its superconducting phase. The low temperature physics of the system is determined by a combined effect of collective soundlike plasma ...

Added: September 12, 2019

Galaktionov A., Golubev D., Zaikin A., European Physical Journal: Special Topics 2019 Vol. 227 No. 15/16 P. 2001-2012

We analyze a trade-o between thermal activation (TA) and quantum tunneling in the problem of supercurrent decay in superconducting junctions with highly transparent barriers. In such systems -- unlike in conventional tunnel junctions -- the supercurrent decay is essentially influenced by low energy Andreev levels forming an intrinsic quantum dissipative environment for the Josephson particle. ...

Added: March 11, 2019

Temu E., Lahteenmaki P., Golubev D. et al., Journal of Low Temperature Physics 2017 Vol. 189 P. 204-216

We have employed noise thermometry for investigations of thermal relaxation
between the electrons and the substrate in nanowires patterned from 40-nm-thick
titanium film on top of silicon wafers covered by a native oxide. By controlling the
electronic temperature Te by Joule heating at the base temperature of a dilution refrigerator,
we probe the electron–phonon coupling and the thermal boundary ...

Added: December 5, 2017

Шеин К. В., Заруднева А. А., Емельянова В. О. et al., Physics of the Solid State 2020 Vol. 62 No. 9 P. 1539-1542

The transport properties of two types of quasi-one-dimensional superconducting microstructures were investigated at ultra-low temperatures: the narrow channels close-packed in the shape of meander, and the chains of tunneling contacts "superconductor-insulator-superconductor." Both types of the microstructures demonstrated high value of high-frequency impedance and-or the dynamic resistance. The study opens up potential for using of such ...

Added: September 18, 2020

Arutyunov K., Лехтинен Я., Trefilov D. et al., Физика твердого тела 2021 Т. 63 № 9 С. 1233-1237

Utilization of of superconducting materials for new-generation nanoelectronic devices seems
extremely tempting because of the absence of energy dissipation during the electric current flow. However, in
small systems, the role of fluctuations can be highly important. In this study, the transport properties of thin
superconducting titanium nanoribbons have been experimentally and theoretically investigated. It has been
shown that quantum ...

Added: October 24, 2021

Averin D., Wang G., Vasenko A., Physical Review B: Condensed Matter and Materials Physics 2020 Vol. 102 No. 14 P. 144516-1-144516-6

We extend the basic theory of Andreev reflection (AR) in a normal metal/superconductor junction to the situation with an arbitrary time-dependent bias voltage V(t) across the junction. The central element of the theory is the fact that the Fourier transform of the AR amplitude has a casual structure. As an example, the theory is used to describe ...

Added: October 13, 2020

Arutyunov K., M.: Lebedev Institute, 2017

Superconducting properties of metallic nanowires can be entirely different from those of bulk superconductors because of the dominating role played by thermal and quantum fluctuations of the order parameter. For superconducting channels with diameters below ∼ 50 nm fluctuations of the phase of the complex order parameter - the phase slippage - lead to non-zero ...

Added: October 1, 2017

Arutyunov K., Lehtinen J. S., Radkevich A. A. et al., Journal of Magnetism and Magnetic Materials 2018 Vol. 459 P. 356-358

Quasi-one-dimensional superconducting channels host sound-like plasma modes propagating along the
which are associated with fluctuations of the phase of the superconducting order parameter (Mooiji and
1985) [5]. Interaction between these electromagnetic excitations and charge carriers affects the electron density
of states (DOS). I-V characteristics of tunnel S1-I-S2 junctions, where superconducting S2 electrode
nanowire in the regime of quantum fluctuations ...

Added: October 1, 2017

M.: Faculty of Physics, MSU, 2017

The Low Temperature Physics Conference is an international event held every three years, under the auspices of the IUPAP through its Commission C5 on Low Temperature Physics. The aim of these conferences is to exchange information and views among the members of the international scientific community in the general field of Low Temperature Physics. It ...

Added: October 1, 2017

Arutyunov K., Lehtinen J. S., Радкевич А. А. et al., Физика твердого тела 2017 Т. 59 № 11 С. 2092-2094

The current–voltage characteristics of superconductor–insulator–semiconductor (S1–I–S2)
tunnel junctions, where superconducting electrode S2 is a thin nanowire, are studied experimentally. The
observed blurring of the gap singularities is interpreted as a manifestation of the order parameter quantum
fluctuations. We propose a model taking into account the broadening of the density of states due to the interaction
of electrons with the ...

Added: October 1, 2017

Arutyunov K., Lehtinen J. S., Beilstein Journal of Nanotechnology 2020 Vol. 11 P. 417-420

Chain of superconductor-insulator-superconductor junctions based on Al-AlOx-Al... lift-off fabricated nanostructures was measured at ultra-low temperatures. At zero magnetic field the low current bias dynamic resistance can reach values ~1011 W. The system has been proved to provide a decent quality current biasing circuit enabling observation of Coulomb blockade and Bloch oscillations in ultra-narrow Ti nanowires ...

Added: September 18, 2020

Шапиро Д. С., Mirlin A., Shnirman A., Physical Review B: Condensed Matter and Materials Physics 2021 Vol. 104 No. 3 Article 035434

We consider an interferometer based on artificially induced topological superconductivity and chiral one-dimensional (1D) Majorana fermions. The (nontopological) superconducting island inducing the superconducting correlations in the topological substrate is assumed to be floating. This allows probing the physics of interfering Majorana modes via microwave response, i.e., the frequency-dependent impedance between the island and the earth. ...

Added: October 31, 2021

Dolgirev P., Kalenkov M., Tarkhov A. et al., Physical Review B: Condensed Matter and Materials Physics 2019 Vol. 100 No. 054511 P. 1-11

We present a detailed theoretical description of quantum coherent electron transport in voltage-biased
crosslike Andreev interferometers.Making use of the charge conjugation symmetry encoded in the quasiclassical
formalism, we elucidate a crucial role played by geometric and electron-hole asymmetries in these structures.
We argue that a nonvanishing Aharonov-Bohm-like contribution to the current IS flowing in the superconducting
contour may develop ...

Added: September 12, 2019

Semenov A. G., Zaikin A., Physical Review B: Condensed Matter and Materials Physics 2019 Vol. 99 No. 9 P. 094516-1-094516-9

We work out a microscopic theory describing complete statistics of voltage fluctuations generated by quantum phase slips (QPS) in superconducting nanowires. We evaluate the cumulant generating function and demonstrate that shot noise of the voltage as well as the thir d and all higher voltage cumulants differ from zero only due to the presence of ...

Added: October 31, 2019

Curran P., Kim J., Satchell N. et al., Applied Physics Letters 2015 Vol. 107 P. 262602-262602

We demonstrate that the magnetic state of a superconducting spin valve, that is normally controlled with an external magnetic field, can also be manipulated by varying the temperature which increases the functionality and flexibility of such structures as switching elements. In this case, switching is driven by changes in the magnetostatic energy due to spontaneous ...

Added: February 22, 2017

Zaikin A., Golubev D., Singapore: Pan Stanford Publishing, 2019

Continuing miniaturization of electronic devices, together with the quickly growing number of nanotechnological applications, demands a profound understanding of the underlying physics. Most of the fundamental problems of modern condensed matter physics involve various aspects of quantum transport and fluctuation phenomena at the nanoscale. In nanostructures, electrons are usually confined to a limited volume and ...

Added: September 12, 2019

Stroganov P. L., Fominov Y., Cooper pair splitting in ballistic ferromagnetic SQUIDs / Cornell University. Series cond-mat "arxiv.org". 2017. No. arXiv:1708.05089.

We consider ballistic SQUIDs with spin filtering inside half-metallic ferromagnetic arms. A singlet Cooper pair cannot pass through an arm in this case, so the Josephson current is entirely due to the Cooper pair splitting, with two electrons going to different interferometer arms. In order to elucidate the mechanisms of Josephson transport due to split ...

Added: October 18, 2017

Averin D., Wang G., Vasenko A., Time-dependent Andreev reflection / Cornell University. Series cond-mat "arxiv.org". 2020. No. 2007.07483.

We extend the basic theory of Andreev reflection (AR) in a normal metal/superconductor junction to the situation with an arbitrary time-dependent bias voltage V(t) across the junction. The central element of the theory is the fact that the Fourier transform of the AR amplitude has a casual structure. As an example, the theory is used to describe ...

Added: July 28, 2020

Dolgoprudni: [б.и.], 2016

Book of abstracts ...

Added: November 20, 2016

Arutyunov K., Lehtinen J. S., В кн.: "Нанофизика и наноэлектроника" Труды XXI Международного симпозиума. .: Н. Новгород: Издательство Нижегородского государственного университета им. Н.И. Лобачевского, 2017.. С. 23-24.

Экспериментально исследовались вольт-амперные характеристики туннельных контактов сверхпроводник – изолятор – сверхпроводник (С1-И-С2), где сверхпроводящий электрод С2 представлял из себя тонкий нанопровод. Обнаруженное размытие щелевых особенностей интерпретируется как проявление эффекта квантовых флуктуаций модуля параметра порядка. Практическим результатом работы является установление границ применимости в наноэлектронных устройствах сверхпроводящих элементов сверхмалых размеров. ...

Added: October 1, 2017

Arutyunov K., Lehtinen J. S., Radkevich A. A. et al., Physics of the Solid State 2017 Vol. 59 No. 11 P. 2110-2113

The current–voltage characteristics of superconductor–insulator–semiconductor (S1–I–S2)
tunnel junctions, where superconducting electrode S2 is a thin nanowire, are studied experimentally. The
observed blurring of the gap singularities is interpreted as a manifestation of the order parameter quantum
fluctuations. We propose a model taking into account the broadening of the density of states due to the interaction
of electrons with the ...

Added: November 29, 2017

Radkevich A. A., Semenov A. G., Zaikin A., European Physical Journal: Special Topics 2019 Vol. 227 No. 15-16 P. 2289-2295

We investigate the influence of quantum phase fluctuations on electron density of states (DOS) in ultrathin superconducting films and nanowires. Using an effective action approach we derive a non-perturbative correction to DOS in such systems. The main effect of phase fluctuations in quasi-two-dimensional films is the appearance of electron states at subgap energies while in ...

Added: October 28, 2019

Ioselevich P., Чукланов Д. А., Письма в Журнал экспериментальной и теоретической физики 2021 Т. 113 № 10 С. 661-668

Рассматривается длинный диффузный контакт Джозефсона, слабой связью в котором является тонкий бислой нормальный металл (N)–ферромагнетик (F), так что N и F образуют параллельные связи между сверхпроводниками S. Показано, что сверхпроводимость в такой слабой связи описывается эффективным одномерным уравнением Узаделя, содержащим ослабленное обменное поле, а также распаривающий член. Механизм распаривания основан на неотъемлемой неоднородности бислоя и ...

Added: October 25, 2021