Distinction of Nuclear Spin States with the Scanning Tunneling Microscope

Distinction of nuclear spin states with the scanning tunneling microscope.

We demonstrate rotational excitation spectroscopy with the scanning tunneling microscope for physisorbed H(2) and its isotopes HD and D(2). The observed excitation energies are very close to the gas phase values and show the expected scaling with the moment of inertia. Since these energies are characteristic for the molecular nuclear spin states we are able to identify the para and ortho specie...

Simulating Scanning Tunneling Microscope

Investigation of non-collinear spin states with scanning tunneling microscopy.

Most ferromagnetic and antiferromagnetic substances show a simple collinear arrangement of the local spins. Under certain circumstances, however, the spin configuration is non-collinear. Scanning tunneling microscopy with its potential atomic resolution is an ideal tool for investigating these complex spin structures. Non-collinearity can be due to topological frustration of the exchange intera...

Scanning tunneling microscope operating as a spin diode

P. H. Penteado,1,2 F. M. Souza,2 A. C. Seridonio,3 E. Vernek,2 and J. C. Egues1 1Instituto de Fı́sica de São Carlos, Universidade de São Paulo, 13560-970, São Carlos, SP, Brazil 2Instituto de Fı́sica, Universidade Federal de Uberlândia, 38400-902, Uberlândia, MG, Brazil 3Departamento de Fı́sica e Quı́mica, Universidade Estadual Paulista Júlio de Mesquita Filho, 15385-000, Ilha Solteira, SP, Brazil....

Theory of the scanning tunneling microscope.

We present a theory for tunneling between a real surface and a model probe tip, applicable to the recently developed "scanning tunneling microscope." The tunneling current is found to be proportional to the local density of states of the surface, at the position of the tip. The effective lateral resolution is related to the tip radius R and the vacuum gap distance d approximately as [(2 A)(R +d...