Martin M, Lastapis M, Riedel D, Dujardin G, Mamatkulov M, Stauffer L, Sonnet Ph
Laboratoire de Photophysique Moléculaire, Bâtiment 210, Université Paris Sud, 91405 Orsay Cedex, France.
Phys Rev Lett. 2006 Nov 24;97(21):216103. doi: 10.1103/PhysRevLett.97.216103. Epub 2006 Nov 21.
At low temperature (5 K), a single biphenyl molecule adsorbed on a Si(100) surface behaves as a bistable device which can be reversibly switched by electronic excitation with the scanning tunneling microscope tip. Density functional theory suggests that the biphenyl molecule is adsorbed with one dissociated hydrogen atom bonded to a neighbor surface silicon atom. By desorbing this hydrogen atom with the STM tip, the interaction of the molecule with the surface is modified such that it becomes transformed into a multistable device with four stable states having switching yields increased by almost 2 orders of magnitude.
在低温（5K）下，吸附在Si(100)表面的单个联苯分子表现为一种双稳态器件，可通过扫描隧道显微镜针尖的电子激发进行可逆切换。密度泛函理论表明，联苯分子吸附时，有一个解离的氢原子与相邻的表面硅原子键合。通过用扫描隧道显微镜针尖解吸这个氢原子，分子与表面的相互作用被改变，从而使其转变为具有四个稳定状态的多稳态器件，开关产率提高了近两个数量级。
