Study of Quasi-Particle Recombination Rate by Injection Experiment Using Narrow Superconducting Wire and DC-SQUID Junctions

Yagi, Ryuta; Tsuboi, Kazuki; Morimoto, Ryohei; Matsumura, T.; Kobara, Hiroaki

doi:10.1143/jpsj.78.054704

Cited by 5 publications

(10 citation statements)

References 12 publications

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“…11(b)]. The obtained value for the relaxation length of the charge imbalance Λ Q * = Dτ Q * varies from 3.5 to 6.5 µm being in a reasonable agreement with the existing data [80,81,82,83,97].…”

Section: Charge Imbalance (Transverse Mode)supporting

confidence: 87%

“…( 12), the population difference between the electron-like and the hole-like spectrum branches of the excitation spectrum f k> = f k< leads to the appearance of the finite NIS detector current at a zero V d referred to as the excess current, I ex d ≡ I d (V d = 0). This effect has been observed both in early works on flat structures of the 'sandwich' type [78,60] and in the recent research on multiterminal NIS structures [80,81,82,83]. Within the phenomenological description the nonzero value of the excess current is related to the deviation of the Cooper pairs chemical potential µ S from its equilibrium value [expression Eq.…”

Section: Charge Imbalance (Transverse Mode)mentioning

confidence: 86%

“…There have recently appeared series of experimental papers where an attempt to develop the aforementioned observations for a case when an injection and a detection of nonequilibrium quasiparticles are spatially separated was made [80,81,82,83] (see Fig. 5).…”

Section: Early Experiments and Phenomenological Modelsmentioning

confidence: 99%

“…6). The sample layout was similar to the layout, described in [80,81,82,83] and [86,87]. Electrons were injected from a normal metal through a tunnel junction into a superconductor.…”

Section: Spatially Resolved Measurement Setupmentioning

confidence: 99%

See 3 more Smart Citations

Relaxation of Nonequilibrium Quasiparticles in Mesoscopic Size Superconductors

Arutyunov,

Chernyaev,

Karabassov

et al. 2018

Preprint

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Rapid development of micro-and nanofabrication methods have provoked interest and enabled experimental studies of electronic properties of a vast class of (sub)micrometersize solid state systems. Mesoscopic-size hybrid structures, containing superconducting elements, have become interesting objects for basic research studies and various applications, ranging from medical and astrophysical sensors to quantum computing. One of the most important aspects of physics, governing the behavior of such systems, is the finite concentration of nonequilibrium quasiparticles, present in a superconductor even well below the temperature of superconducting transition. Those nonequilibrium excitations might limit the performance of a variety of superconducting devices, like superconducting qubits, singleelectron turnstiles and microrefrigerators. On the contrary, in some applications, like detectors of electromagnetic radiation, the nonequilibrium state is essential for their operation. It is therefore of vital importance to study the mechanisms of nonequilibrium quasiparticle relaxation in superconductors of mesoscopic dimensions, where the whole structure can be considered as an 'interface'. At early stages of research the problem was mostly studied in relatively massive systems and at high temperatures close to the critical temperature of a superconductor. We review the recent progress in studies of nonequilibrium quasiparticle relaxation in superconductors including the low temperature limit. We also discuss the open physical questions and perspectives of development in the field.

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Section: Charge Imbalance (Transverse Mode)supporting

confidence: 87%

Section: Charge Imbalance (Transverse Mode)mentioning

confidence: 86%

Section: Early Experiments and Phenomenological Modelsmentioning

confidence: 99%

“…6). The sample layout was similar to the layout, described in [80,81,82,83] and [86,87]. Electrons were injected from a normal metal through a tunnel junction into a superconductor.…”

Section: Spatially Resolved Measurement Setupmentioning

confidence: 99%

See 2 more Smart Citations

Relaxation of Nonequilibrium Quasiparticles in Mesoscopic Size Superconductors

Arutyunov,

Chernyaev,

Karabassov

et al. 2018

Preprint

View full text Add to dashboard Cite

show abstract

“…week ending 24 JANUARY 2014 036602-2 extra resistance below T C arise from the charge imbalance effect, related to the charge relaxation process of quasiparticles in superconductors as reported first in the 1970s [16]. The properties of the charge imbalance effect are also discussed recently, especially for the low temperature properties [17], the spatial evolution [18,19] and the spin polarized electrons [20]. The result of the charge imbalance effect in Fig.…”

mentioning

confidence: 77%

Spin Injection into a Superconductor with Strong Spin-Orbit Coupling

et al. 2014

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We demonstrate spin injection into superconducting Nb by employing a spin absorption technique in lateral spin valve structures. Spin currents flowing in a nonmagnetic Cu channel are preferably absorbed into Nb due to its strong spin-orbit interaction, the amount of which dramatically changes below or above the superconducting critical temperature (TC). The charge imbalance effect observed in the Cu/Nb interface ensures that superconducting Nb absorbs pure spin currents even below TC. Our analyses based on the density of states calculated using the Usadel equation can well reproduce the experimental results, implying that the strong spin-orbit interaction of Nb is still effective for the spin absorption even below TC. Most importantly, our method allows us to determine the intrinsic spin relaxation time in the superconducting Nb, which reaches more than 4 times greater than that in the normal state.

show abstract

Relaxation of nonequilibrium quasiparticles in mesoscopic size superconductors

Arutyunov

Chernyaev

Karabassov

et al. 2018

J. Phys.: Condens. Matter

View full text Add to dashboard Cite

Rapid development of micro- and nanofabrication methods have provoked interest and enabled experimental studies of electronic properties of a vast class of (sub)micrometer-size solid state systems. Mesoscopic-size hybrid structures, containing superconducting elements, have become interesting objects for basic research studies and various applications, ranging from medical and astrophysical sensors to quantum computing. One of the most important aspects of physics, governing the behavior of such systems, is the finite concentration of nonequilibrium quasiparticles, present in a superconductor even well below the temperature of superconducting transition. Those nonequilibrium excitations might limit the performance of a variety of superconducting devices, like superconducting qubits, single-electron turnstiles and microrefrigerators. On the contrary, in some applications, like detectors of electromagnetic radiation, the nonequilibrium state is essential for their operation. It is therefore of vital importance to study the mechanisms of nonequilibrium quasiparticle relaxation in superconductors of mesoscopic dimensions, where the whole structure can be considered as an 'interface'. At early stages of research the problem was mostly studied in relatively massive systems and at high temperatures close to the critical temperature of a superconductor. We review the recent progress in studies of nonequilibrium quasiparticle relaxation in superconductors including the low temperature limit. We also discuss the open physical questions and perspectives of development in the field.

show abstract

Study of Quasi-Particle Recombination Rate by Injection Experiment Using Narrow Superconducting Wire and DC-SQUID Junctions

Cited by 5 publications

References 12 publications

Relaxation of Nonequilibrium Quasiparticles in Mesoscopic Size Superconductors

Relaxation of Nonequilibrium Quasiparticles in Mesoscopic Size Superconductors

Spin Injection into a Superconductor with Strong Spin-Orbit Coupling

Relaxation of nonequilibrium quasiparticles in mesoscopic size superconductors

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