Kuai xiaban le, Fang Yumin (方玉敏) huran piejian (瞥见) bolichuang wai zhanzhe yige shuxide shenying (身影). Shi ta, mei cuor, yige chang lai da you mǎi cu de xiaonanhai. Ng? Ta zenme bu jinlai ne, shi diule qian, h...Kuai xiaban le, Fang Yumin (方玉敏) huran piejian (瞥见) bolichuang wai zhanzhe yige shuxide shenying (身影). Shi ta, mei cuor, yige chang lai da you mǎi cu de xiaonanhai. Ng? Ta zenme bu jinlai ne, shi diule qian, haishi shuaisuile pingzi? Fang Yumin jinnian ershi sui, qunian shijiu sui, qiannian shiba sui a, shiba suigaozhong biye qian, ta dui jijiang kaishi de shenghuo youguo duoshao meilide meng a. Zai zhexie meng zhong, ta ceng huaguo yi fu tuhua: Ta dangshangle nǖjiaoshi,展开更多
For a two-dimensional ultra-cold Fermi superfluid with an effective static magnetic impurity, we theoretically investigated the variation of the Yu–Shiba–Rusinov(YSR) bound state in the Bardeen–Cooper–Schrieffer(B...For a two-dimensional ultra-cold Fermi superfluid with an effective static magnetic impurity, we theoretically investigated the variation of the Yu–Shiba–Rusinov(YSR) bound state in the Bardeen–Cooper–Schrieffer(BCS) to Bose–Einstein condensation(BEC) crossover regime.Within the framework of mean-field theory, analytical results of the YSR bound state energy were obtained as a function of the interaction parameters.First, when the background Fermi superfluid system stays in the weakly interacting BCS regime, we found that the YSR bound state energy is linearly dependent on the gap parameter with its coefficient slightly different from previous results.Second, we discovered re-entrance phenomena for the YSR state and an upper bound of the strength of the interaction between the paired atoms.By carefully analyzing the bound state energy as a function of the interaction parameters, we obtained a phase diagram showing the existence of the YSR state.Finally, we concluded that the re-entrance phenomena and the critical point can be easily experimentally detected through measurement of radio-frequency spectroscopy and density of states using current experimental techniques.展开更多
The control of the Kondo effect is of great interest in single-molecule junction due to its potential applications in spin based electronics.Here,we demonstrate that the Kondo effect is reversibly switched on and off ...The control of the Kondo effect is of great interest in single-molecule junction due to its potential applications in spin based electronics.Here,we demonstrate that the Kondo effect is reversibly switched on and off in an iron phthalocyanine(FePc)single-molecule junction by using a superconducting Nb tip.In a scanning tunneling microscope-based Nb-insulator-FePc-Au junction,we achieve a reversible switching between the Kondo dip and inelastic electronic tunneling spectra by simply adjusting the tip-sample distance to tune the tunnel coupling at low temperature.Further approaching the tip leads to the picking up of the molecule to the tip apex,which transfers the geometry of the single-molecule junction into a Nb-FePc-insulator-Au type.As the molecule forms an effective magnetic impurity embedded into the superconducting ground states of the Nb tip,the out-gap Kondo dip switched to an in-gap Yu-Shiba-Rusinov state.Our results open up a new route for manipulating the Kondo effect within a single-molecule junction.展开更多
文摘Kuai xiaban le, Fang Yumin (方玉敏) huran piejian (瞥见) bolichuang wai zhanzhe yige shuxide shenying (身影). Shi ta, mei cuor, yige chang lai da you mǎi cu de xiaonanhai. Ng? Ta zenme bu jinlai ne, shi diule qian, haishi shuaisuile pingzi? Fang Yumin jinnian ershi sui, qunian shijiu sui, qiannian shiba sui a, shiba suigaozhong biye qian, ta dui jijiang kaishi de shenghuo youguo duoshao meilide meng a. Zai zhexie meng zhong, ta ceng huaguo yi fu tuhua: Ta dangshangle nǖjiaoshi,
基金Project supported by the National Key R&D Program of China(Grant No.2017YFA0206302)
文摘For a two-dimensional ultra-cold Fermi superfluid with an effective static magnetic impurity, we theoretically investigated the variation of the Yu–Shiba–Rusinov(YSR) bound state in the Bardeen–Cooper–Schrieffer(BCS) to Bose–Einstein condensation(BEC) crossover regime.Within the framework of mean-field theory, analytical results of the YSR bound state energy were obtained as a function of the interaction parameters.First, when the background Fermi superfluid system stays in the weakly interacting BCS regime, we found that the YSR bound state energy is linearly dependent on the gap parameter with its coefficient slightly different from previous results.Second, we discovered re-entrance phenomena for the YSR state and an upper bound of the strength of the interaction between the paired atoms.By carefully analyzing the bound state energy as a function of the interaction parameters, we obtained a phase diagram showing the existence of the YSR state.Finally, we concluded that the re-entrance phenomena and the critical point can be easily experimentally detected through measurement of radio-frequency spectroscopy and density of states using current experimental techniques.
基金supported by the National Key Research and Development Program of China(Nos.2019YFA0308500 and 2018YFA0305800)the National Natural Science Foundation of China(Nos.52022105 and 61888102)the Strategic Priority Research Program of Chinese Academy of Sciences(Nos.XDB28000000 and XDB30000000)。
文摘The control of the Kondo effect is of great interest in single-molecule junction due to its potential applications in spin based electronics.Here,we demonstrate that the Kondo effect is reversibly switched on and off in an iron phthalocyanine(FePc)single-molecule junction by using a superconducting Nb tip.In a scanning tunneling microscope-based Nb-insulator-FePc-Au junction,we achieve a reversible switching between the Kondo dip and inelastic electronic tunneling spectra by simply adjusting the tip-sample distance to tune the tunnel coupling at low temperature.Further approaching the tip leads to the picking up of the molecule to the tip apex,which transfers the geometry of the single-molecule junction into a Nb-FePc-insulator-Au type.As the molecule forms an effective magnetic impurity embedded into the superconducting ground states of the Nb tip,the out-gap Kondo dip switched to an in-gap Yu-Shiba-Rusinov state.Our results open up a new route for manipulating the Kondo effect within a single-molecule junction.
