Anisotropic Pauli spin blockade in hole quantum dots

被引：35

作者：

Brauns, Matthias ^{[1
]}

Ridderbos, Joost ^{[1
]}

Li, Ang ^{[2
,5
]}

Bakkers, Erik P. A. M. ^{[2
,3
,4
]}

van der Wiel, Wilfred G. ^{[1
]}

Zwanenburg, Floris A. ^{[1
]}

机构：

[1] Univ Twente, MESA Inst Nanotechnol, NanoElect Grp, POB 217, NL-7500 AE Enschede, Netherlands

[2] Eindhoven Univ Technol, Dept Appl Phys, Postbox 513, NL-5600 MB Eindhoven, Netherlands

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

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

[5] Beijing Univ Technol, Inst Microstruct & Property Adv Mat, Pingleyuan 100, Beijing 100024, Peoples R China

来源：

PHYSICAL REVIEW B | 2016年 / 94卷 / 04期

关键词：

GE/SI HETEROSTRUCTURE NANOWIRE; ISOTOPE-SEPARATION; SINGLE-CRYSTALS; TRANSPORT; GROWTH;

D O I：

10.1103/PhysRevB.94.041411

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We present measurements on gate-defined double quantum dots in Ge-Si core-shell nanowires, which we tune to a regime with visible shell filling in both dots. We observe a Pauli spin blockade and can assign the measured leakage current at low magnetic fields to spin-flip cotunneling, for which we measure a strong anisotropy related to an anisotropic g factor. At higher magnetic fields we see signatures for leakage current caused by spin-orbit coupling between (1,1) singlet and (2,0) triplet states. Taking into account these anisotropic spin-flip mechanisms, we can choose the magnetic field direction with the longest spin lifetime for improved spin-orbit qubits.

引用

页数：5

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