Impurity Knight shift in quantum dot Josephson junctions

被引：5

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

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

Jafari, A. R. .

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

[42] 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

[43] Macroscopic quantum tunneling and dissipation in c-axis twist Josephson junctions [J].

Kawabata, S ;

Asano, Y ;

Kashiwaya, S ;

Tanaka, Y .

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS, 2006, 67 (1-3) :120-122

[44] Effects of a resonant cavity on macroscopic quantum tunneling of fluxons in long Josephson junctions [J].

Kim, Ju H. ;

Dhungana, Ramesh P. .

PHYSICAL REVIEW B, 2011, 83 (06)

[45] Spin magnetic moment current of impurity electron in a spherical quantum dot [J].

Amirkhanyan, S. M. ;

Kazaryan, E. M. ;

Sarkisyan, H. A. .

JOURNAL OF CONTEMPORARY PHYSICS-ARMENIAN ACADEMY OF SCIENCES, 2014, 49 (06) :264-271

[46] Excitations in doped quantum dot driven by periodically fluctuating impurity domain [J].

Chatterjee, Kashinath ;

Datta, Nirmal Kr ;

Ghosh, Manas .

JOURNAL OF APPLIED PHYSICS, 2011, 109 (10)

[47] Stability of neutral and negative donor impurity in a semiconductor cylindrical quantum dot [J].

Safwan, S. A. ;

El Meshed, Nagwa ;

Asmaa, A. S. ;

Hekmat, M. H. .

PHYSICA B-CONDENSED MATTER, 2009, 404 (16) :2294-2298

[48] Energy and binding energy of donor impurity in quantum dot with Gaussian confinement [J].

Al-Hayek, I. ;

Sandouqa, A. S. .

SUPERLATTICES AND MICROSTRUCTURES, 2015, 85 :216-225

[49] Electromagnetically induced transparency in a multilayered spherical quantum dot with hydrogenic impurity [J].

Pavlovic, Vladan ;

Susnjar, Marko ;

Petrovic, Katarina ;

Stevanovic, Ljiljana .

OPTICAL MATERIALS, 2018, 78 :191-200

[50] Optical absorption of a hydrogenic impurity in a disc-shaped quantum dot [J].

Wei, Ruihao ;

Xie, Wenfang .

CURRENT APPLIED PHYSICS, 2010, 10 (03) :757-760

← 1 2 3 4 5 →