We report on the transport study of a double quantum dot(DQD)device made from a freestanding,single crystalline InSb nanosheet.The freestanding nanosheet is grown by molecular beam epitaxy and the DQD is defined by th...We report on the transport study of a double quantum dot(DQD)device made from a freestanding,single crystalline InSb nanosheet.The freestanding nanosheet is grown by molecular beam epitaxy and the DQD is defined by the top gate technique.Through the transport measurements,we demonstrate how a single quantum dot(QD)and a DQD can be defined in an InSb nanosheet by tuning voltages applied to the top gates.We also measure the charge stability diagrams of the DQD and show that the charge states and the inter-dot coupling between the two individual QDs in the DQD can be efficiently regulated by the top gates.Numerical simulations for the potential profile and charge density distribution in the DQD have been performed and the results support the experimental findings and provide a better understanding of fabrication and transport characteristics of the DQD in the InSb nanosheet.The achieved DQD in the two-dimensional InSb nanosheet possesses pronounced benefits in lateral scaling and can thus serve as a new building block for the developments of quantum computation and quantum simulation technologies.展开更多
基金Project supported by the National Key Research and Development Program of China(Grant Nos.2017YFA0303304,2016YFA0300601,2017YFA0204901,2016YFA0300802)the National Natural Science Foundation of China(Grant Nos.91221202,91421303,11874071,11974030,and 61974138)+3 种基金the Beijing Academy of Quantum Information Sciences(Grant No.Y18G22)the Key-Area Research and Development Program of Guangdong Province,China(Grant No.2020B0303060001)the Beijing Natural Science Foundation,China(Grant Nos.1202010 and 1192017)the support from Youth Innovation Promotion Association,Chinese Academy of Sciences(Grant No.2017156)。
文摘We report on the transport study of a double quantum dot(DQD)device made from a freestanding,single crystalline InSb nanosheet.The freestanding nanosheet is grown by molecular beam epitaxy and the DQD is defined by the top gate technique.Through the transport measurements,we demonstrate how a single quantum dot(QD)and a DQD can be defined in an InSb nanosheet by tuning voltages applied to the top gates.We also measure the charge stability diagrams of the DQD and show that the charge states and the inter-dot coupling between the two individual QDs in the DQD can be efficiently regulated by the top gates.Numerical simulations for the potential profile and charge density distribution in the DQD have been performed and the results support the experimental findings and provide a better understanding of fabrication and transport characteristics of the DQD in the InSb nanosheet.The achieved DQD in the two-dimensional InSb nanosheet possesses pronounced benefits in lateral scaling and can thus serve as a new building block for the developments of quantum computation and quantum simulation technologies.
