We report the experimental investigation of the superconductor-metal quantum phase transition of the Eu O/KTa O3 interface.Around the transition,a divergence of the dynamical critical exponent is observed,which suppor...We report the experimental investigation of the superconductor-metal quantum phase transition of the Eu O/KTa O3 interface.Around the transition,a divergence of the dynamical critical exponent is observed,which supports the quantum Griffiths singularity in the Eu O/KTa O3 interface.The quantum Griffiths singularity could be attributed to large rare superconducting regions and quenched disorders at the interface.Our results could pave the way for studying the exotic superconducting properties at the Eu O/KTa O3 interface.展开更多
We investigate the thermoelectric-transport properties of metal/graphene/metal hetero-structure.We use a single band tight-binding model to present the two-dimensional electronic band structure of graphene.Using the L...We investigate the thermoelectric-transport properties of metal/graphene/metal hetero-structure.We use a single band tight-binding model to present the two-dimensional electronic band structure of graphene.Using the Landauer-Butticker formula and taking the coupling between graphene and the two electrodes into account,we can calculate the thermoelectric potential and current versus temperature.It is found that in spite of metal electrodes,the carrier type of graphene determines the electron motion direction driven by the difference in temperature between the two electrodes,while for n type graphene,the electrons move along the thermal gradient,and for p type graphene,the electrons move against the thermal gradient.展开更多
基金Supported by the National Key R&D Program of China(Grant Nos.2019YFA0308401 and 2017YFA0303301)the National Natural Science Foundation of China(Grant Nos.11974025,11674009,and 11934016)+1 种基金the Beijing Natural Science Foundation(Grant No.1192009)the Strategic Priority Research Program of the Chinese Academy of Sciences(Grant No.XDB28000000)。
文摘We report the experimental investigation of the superconductor-metal quantum phase transition of the Eu O/KTa O3 interface.Around the transition,a divergence of the dynamical critical exponent is observed,which supports the quantum Griffiths singularity in the Eu O/KTa O3 interface.The quantum Griffiths singularity could be attributed to large rare superconducting regions and quenched disorders at the interface.Our results could pave the way for studying the exotic superconducting properties at the Eu O/KTa O3 interface.
基金Project supported by the National Natural Science Foundation of China (Grant No. 60621061)the National Basic Research Program of China (Grant Nos. 2006CB921305 and 2009CB929103)
文摘We investigate the thermoelectric-transport properties of metal/graphene/metal hetero-structure.We use a single band tight-binding model to present the two-dimensional electronic band structure of graphene.Using the Landauer-Butticker formula and taking the coupling between graphene and the two electrodes into account,we can calculate the thermoelectric potential and current versus temperature.It is found that in spite of metal electrodes,the carrier type of graphene determines the electron motion direction driven by the difference in temperature between the two electrodes,while for n type graphene,the electrons move along the thermal gradient,and for p type graphene,the electrons move against the thermal gradient.
基金supported by the National Basic Research Program of China(2019YFA0308403 and 2022YFA1403700)the National Natural Science Foundation of China(12147126)Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions。
基金supported by the National Key R&D Program of China(2019YFA0308402 and 2018YFA0305604)the Innovation Program for Quantum Science and Technology(2021ZD0302403)+1 种基金the National Natural Science Foundation of China(11934001,92265106,11774010,and 11921005)Beijing Municipal Natural Science Foundation(JQ20002)。
