Impurity Knight shift in quantum dot Josephson junctions

被引：3

作者：

Pavesic, Luka ^{[1
,2
]}

Pita-Vidal, Marta ^{[3
]}

Bargerbos, Arno ^{[3
]}

Zitko, Rok ^{[1
,2
]}

机构：

[1] Jozef Stefan Inst, Jamova 39, SI-1000 Ljubljana, Slovenia

[2] Univ Ljubljana, Fac Math & Phys, Jadranska 19, SI-1000 Ljubljana, Slovenia

[3] Delft Univ Technol, QuTech & Kavli Inst Nanosci, NL-2600 GA Delft, Netherlands

来源：

SCIPOST PHYSICS | 2023年 / 15卷 / 02期

基金：

荷兰研究理事会;

关键词：

NUCLEAR-MAGNETIC-RESONANCE; NUMERICAL RENORMALIZATION-GROUP; SINGLE-ELECTRON SPIN; PERTURBATION EXPANSION; COHERENT MANIPULATION; ANDERSON MODEL; STATES; SUPERCONDUCTIVITY; EXCHANGE;

D O I：

10.21468/SciPostPhys.15.2.070

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Spectroscopy of a Josephson junction device with an embedded quantum dot reveals the presence of a contribution to level splitting in external magnetic field that is proportional to cos 0, where 0 is the gauge-invariant phase difference across the junction. To elucidate the origin of this unanticipated effect, we systematically study the Zeeman splitting of spinful subgap states in the superconducting Anderson impurity model. The magnitude of the splitting is renormalized by the exchange interaction between the local moment and the continuum of Bogoliubov quasiparticles in a variant of the Knight shift phenomenon. The leading term in the shift is linear in the hybridisation strength I' (quadratic in electron hopping), while the subleading term is quadratic in I' (quartic in electron hopping) and depends on 0 due to spin-polarization-dependent corrections to the Josephson energy of the device. The amplitude of the 0-dependent part is largest for experimentally relevant parameters beyond the perturbative regime where it is investicoupling between the quantum dot spin and the Josephson current could find wide use in superconducting spintronics.

引用

页数：30

共 50 条

[31] Off-central acceptor impurity in a spherical quantum dot [J].

Boichuk, V. I. ;

Leshko, R. Ya ;

Bilynskyi, I. V. ;

Turyanska, L. M. .

CONDENSED MATTER PHYSICS, 2012, 15 (03)

[32] Absence versus Presence of Dissipative Quantum Phase Transition in Josephson Junctions [J].

Masuki, Kanta ;

Sudo, Hiroyuki ;

Oshikawa, Masaki ;

Ashida, Yuto .

PHYSICAL REVIEW LETTERS, 2022, 129 (08)

[33] Robust entanglement of an asymmetric quantum dot molecular system in a Josephson junction [J].

Afsaneh, E. ;

Harouni, M. Bagheri .

HELIYON, 2020, 6 (07)

[34] Supercurrent in a Double Quantum Dot [J].

Saldana, J. C. Estrada ;

Vekris, A. ;

Steffensen, G. ;

Zitko, R. ;

Krogstrup, P. ;

Paaske, J. ;

Grove-Rasmussen, K. ;

Nygard, J. .

PHYSICAL REVIEW LETTERS, 2018, 121 (25)

[35] Supercurrent decay in ballistic magnetic Josephson junctions [J].

Ness, Herve ;

Sadovskyy, Ivan A. ;

Antipov, Andrey E. ;

van Schilfgaarde, Mark ;

Lutchyn, Roman M. .

NPJ COMPUTATIONAL MATERIALS, 2022, 8 (01)

[36] Phase Signature of Topological Transition in Josephson Junctions [J].

Dartiailh, Matthieu C. ;

Mayer, William ;

Yuan, Joseph ;

Wickramasinghe, Kaushini S. ;

Matos-Abiague, Alex ;

Zutic, Igor ;

Shabani, Javad .

PHYSICAL REVIEW LETTERS, 2021, 126 (03)

[37] Josephson junctions based on ultraclean carbon nanotubes [J].

Annabi, S. ;

Arrighi, E. ;

Peugeot, A. ;

Riechert, H. ;

Griesmar, J. ;

Watanabe, K. ;

Taniguchi, T. ;

Bretheau, L. ;

Pillet, J. -d. .

PHYSICAL REVIEW APPLIED, 2024, 22 (06)

[38] Stark shift and photoionization cross section of on-center and off-center donor impurity in a core/shell ellipsoidal quantum dot [J].

Shi, L. ;

Yan, Z. W. .

PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES, 2018, 98 :111-117

[39] Optical properties of hydrogenic impurity in an inhomogeneous infinite spherical quantum dot [J].

Jafari, A. R. .

PHYSICA B-CONDENSED MATTER, 2015, 456 :72-77

[40] Impurity with two electrons in the spherical quantum dot with finite confinement potential [J].

Baghdasaryan, D. A. ;

Ghaltaghchyan, H. Ts ;

Kazaryan, E. M. ;

Sarkisyan, H. A. .

3RD INTERNATIONAL SYMPOSIUM "OPTICS AND ITS APPLICATIONS", 2016, 673

← 1 2 3 4 5 →