Spectroscopy of Spin-Split Andreev Levels in a Quantum Dot with Superconducting Leads

被引：15

作者：

Bargerbos, Arno ^{[1
,2
]}

Pita-Vidal, Marta ^{[1
,2
]}

Zitko, Rok ^{[3
,4
]}

Splitthoff, Lukas J. ^{[1
,2
]}

Grunhaupt, Lukas ^{[1
,2
]}

Wesdorp, Jaap J. ^{[1
,2
]}

Liu, Yu ^{[5
]}

Kouwenhoven, Leo P. ^{[1
,2
]}

Aguado, Ramon ^{[6
]}

Andersen, Christian Kraglund ^{[1
,2
]}

Kou, Angela ^{[7
,8
]}

van Heck, Bernard ^{[9
,10
]}

机构：

[1] Delft Univ Technol, Kavli Inst Nanosci, NL-2600 GA Delft, Netherlands

[2] Delft Univ Technol, QuTech, NL-2600 GA Delft, Netherlands

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

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

[5] Univ Copenhagen, Niels Bohr Inst, Ctr Quantum Devices, DK-2100 Copenhagen, Denmark

[6] CSIC, Inst Ciencia Mat Madrid ICMM, Sor Juana Ines De La Cruz 3, Madrid 28049, Spain

[7] Univ Illinois, Dept Phys, Urbana, IL 61801 USA

[8] Univ Illinois, Frederick Seitz Mat Res Lab, Urbana, IL 61801 USA

[9] Leiden Univ, Leiden Inst Phys, Niels Bohrweg 2, NL-2333 CA Leiden, Netherlands

[10] Univ Roma La Sapienza, Dipartimento Fis, Ple Aldo Moro 5, I-00185 Rome, Italy

来源：

PHYSICAL REVIEW LETTERS | 2023年 / 131卷 / 09期

基金：

荷兰研究理事会;

关键词：

JOSEPHSON CURRENT; SEMICONDUCTOR; FLUCTUATIONS; MODEL;

D O I：

10.1103/PhysRevLett.131.097001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We use a hybrid superconductor-semiconductor transmon device to perform spectroscopy of a quantum dot Josephson junction tuned to be in a spin-1/2 ground state with an unpaired quasiparticle. Because of spin-orbit coupling, we resolve two flux-sensitive branches in the transmon spectrum, depending on the spin of the quasiparticle. A finite magnetic field shifts the two branches in energy, favoring one spin state and resulting in the anomalous Josephson effect. We demonstrate the excitation of the direct spin-flip transition using all-electrical control. Manipulation and control of the spin-flip transition enable the future implementation of charging energy protected Andreev spin qubits.

引用

页数：7

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