Coupling conduction-band valleys in SiGe heterostructures via shear strain and Ge concentration oscillations
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
| Published: |
2023
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| _version_ | 1866910464998375424 |
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| author | Woods, Benjamin D. Soomro, Hudaiba Joseph, E. S. Frink, Collin C. D. Joynt, Robert Eriksson, M. A. Friesen, Mark |
| author_facet | Woods, Benjamin D. Soomro, Hudaiba Joseph, E. S. Frink, Collin C. D. Joynt, Robert Eriksson, M. A. Friesen, Mark |
| contents | Engineering conduction-band valley couplings is a key challenge for Si-based spin qubits. Recent work has shown that the most reliable method for enhancing valley couplings entails adding Ge concentration oscillations to the quantum well. However, ultrashort oscillation periods are difficult to grow, while long oscillation periods do not provide useful improvements. Here, we show that the main benefits of short-wavelength oscillations can be achieved in long-wavelength structures through a second-order coupling process involving Brillouin-zone folding induced by shear strain. We finally show that such strain can be achieved through common fabrication techniques, making this an exceptionally promising system for scalable quantum computing. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2310_18879 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Coupling conduction-band valleys in SiGe heterostructures via shear strain and Ge concentration oscillations Woods, Benjamin D. Soomro, Hudaiba Joseph, E. S. Frink, Collin C. D. Joynt, Robert Eriksson, M. A. Friesen, Mark Mesoscale and Nanoscale Physics Quantum Physics Engineering conduction-band valley couplings is a key challenge for Si-based spin qubits. Recent work has shown that the most reliable method for enhancing valley couplings entails adding Ge concentration oscillations to the quantum well. However, ultrashort oscillation periods are difficult to grow, while long oscillation periods do not provide useful improvements. Here, we show that the main benefits of short-wavelength oscillations can be achieved in long-wavelength structures through a second-order coupling process involving Brillouin-zone folding induced by shear strain. We finally show that such strain can be achieved through common fabrication techniques, making this an exceptionally promising system for scalable quantum computing. |
| title | Coupling conduction-band valleys in SiGe heterostructures via shear strain and Ge concentration oscillations |
| topic | Mesoscale and Nanoscale Physics Quantum Physics |
| url | https://arxiv.org/abs/2310.18879 |