12 papers
Sharp periodic Ge concentration modulations beyond the conduction band valley wavevector in nuclear spin-free Si quantum wells
Ivo Rahlff, Carsten Richter, Martin Schmidbauer +13
Periodic Ge modulations within strained Si quantum wells in SiGe heterostructures offer a route to deterministically enhance conduction-band valley splitting in Si, a key requireme…
Sweet-spot protection of hole spins in sparse arrays via spin-dependent magnetotunneling
Esteban A. RodrÃguez-Mena, Biel MartÃnez, Ahmad Fouad Kalo +2
Recent advances in the scaling of spin qubits have led to the development of sparse architectures where spin qubits are distributed across multiple quantum dots. This distributed a…
Increasing valley splitting in Si/SiGe by practically achievable heterostructure profiles
Lukas Cvitkovich, Peter Stano, Dominique Bougeard +2
Silicon spin qubits are marred by the valley degeneracy of the conduction band. In a nanodevice, the degeneracy is lifted by interfaces and alloy disorder, but the arising valley s…
Valley physics in the two bands model for SiGe heterostructures and spin qubits
Tancredi Salamone, Biel Martinez Diaz, Jing Li +2
We discuss the choice and implementation of inter-valley potentials in the so-called two bands model for the opposite , or valleys of silicon…
Disorder-independent hole spin manipulation by hopping
Biel Martinez, Ana Sempere-Sanchis, José C. Abadillo-Uriel +1
Spin manipulation by hopping has recently emerged as a promising strategy to control hole spins in quantum dots using exclusively baseband control, thereby mitigating power dissipa…
Variability of hole spin qubits in planar Germanium
Biel Martinez, Yann-Michel Niquet
Hole spin qubits in Ge/GeSi heterostructures benefit from the clean environment of epitaxial interfaces and from the intrinsic spin-orbit coupling that enables efficient electrical…