Hybridization and Spin Decoherence in Heavy-Hole Quantum Dots

被引:58
作者
Fischer, Jan [1 ,2 ]
Loss, Daniel [1 ]
机构
[1] Univ Basel, Dept Phys, CH-4056 Basel, Switzerland
[2] Univ Regensburg, Inst Theoret Phys, D-93040 Regensburg, Germany
关键词
ELECTRON SPINS; LOCKING;
D O I
10.1103/PhysRevLett.105.266603
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We theoretically investigate the spin dynamics of a heavy hole confined to an unstrained III-V semiconductor quantum dot and interacting with a narrowed nuclear-spin bath. We show that band hybridization leads to an exponential decay of hole-spin superpositions due to hyperfine-mediated nuclear pair flips, and that the accordant single-hole-spin decoherence time T-2 can be tuned over many orders of magnitude by changing external parameters. In particular, we show that, under experimentally accessible conditions, it is possible to suppress hyperfine-mediated nuclear-pair-flip processes so strongly that hole-spin quantum dots may be operated beyond the "ultimate limitation'' set by the hyperfine interaction which is present in other spin-qubit candidate systems.
引用
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页数:4
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