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Spectroscopic study of Gd nanostructures quantum confined in Fe corrals.

Cao RX, Sun L, Miao BF, Li QL, Zheng C, Wu D, You B, Zhang W, Han P, Bader SD, Zhang WY, Ding HF - Sci Rep (2015)

Bottom Line: The single peak position is close to the higher energy peak of the empty corrals.These findings, attributed to quantum confinement of the corrals and Gd structures trapped inside, are supported by tight-binding calculations.This demonstrates and provides insights into atom trapping in open corrals of various diameters, giving an alternative approach to modify the properties of nano-objects.

View Article: PubMed Central - PubMed

Affiliation: National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, 22 Hankou Road, Nanjing 210093, People's Republic of China.

ABSTRACT
Low dimensional nanostructures have attracted attention due to their rich physical properties and potential applications. The essential factor for their functionality is their electronic properties, which can be modified by quantum confinement. Here the electronic states of Gd atom trapped in open Fe corrals on Ag(111) were studied via scanning tunneling spectroscopy. A single spectroscopic peak above the Fermi level is observed after Gd adatoms are trapped inside Fe corrals, while two peaks appear in empty corrals. The single peak position is close to the higher energy peak of the empty corrals. These findings, attributed to quantum confinement of the corrals and Gd structures trapped inside, are supported by tight-binding calculations. This demonstrates and provides insights into atom trapping in open corrals of various diameters, giving an alternative approach to modify the properties of nano-objects.

No MeSH data available.


The changing of electronic properties after atom trapping.STM image of an array of open Fe corrals of diameters 7.5, 8.5, 9.8 and 10.5 nm before (a) and after (c) trapping Gd adatoms. The image sizes of (a) and (c) are 40 × 40 nm2. The dI/dU spectra are measured at the centers of different corrals before (b) and after (d) trapping Gd adatoms.
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f1: The changing of electronic properties after atom trapping.STM image of an array of open Fe corrals of diameters 7.5, 8.5, 9.8 and 10.5 nm before (a) and after (c) trapping Gd adatoms. The image sizes of (a) and (c) are 40 × 40 nm2. The dI/dU spectra are measured at the centers of different corrals before (b) and after (d) trapping Gd adatoms.

Mentions: Fe and Gd adatoms are deposited onto Ag(111) and the Fe nanocorrals are built via atom manipulation. As demonstrated previously33, stable open nanocorrals on the Ag(111) surface can be built with Fe adatoms that have a favorable diffusion barrier. Figure 1(a) shows the STM image of a 2 × 2 array of open Fe corrals with four different diameters (7.5, 8.5, 9.8 and 10.5 nm) on Ag(111). The image size is 40 × 40 nm2. Two neighboring corrals are separated by 20 nm. In order to study the influence on the electronic properties due to Gd atomic trapping, we first performed spectroscopy at the center of each corral as a reference. The spectroscopy was measured for more than ten times. The average curve and statistical error were plotted in Fig. 1(b). Two characteristic peaks are observed that shift to lower energy with increasing corral diameter. We note that Gd adatoms are driven out of the scanning area with this scanning condition (−0.5 V, 1 nA)33.


Spectroscopic study of Gd nanostructures quantum confined in Fe corrals.

Cao RX, Sun L, Miao BF, Li QL, Zheng C, Wu D, You B, Zhang W, Han P, Bader SD, Zhang WY, Ding HF - Sci Rep (2015)

The changing of electronic properties after atom trapping.STM image of an array of open Fe corrals of diameters 7.5, 8.5, 9.8 and 10.5 nm before (a) and after (c) trapping Gd adatoms. The image sizes of (a) and (c) are 40 × 40 nm2. The dI/dU spectra are measured at the centers of different corrals before (b) and after (d) trapping Gd adatoms.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4498218&req=5

f1: The changing of electronic properties after atom trapping.STM image of an array of open Fe corrals of diameters 7.5, 8.5, 9.8 and 10.5 nm before (a) and after (c) trapping Gd adatoms. The image sizes of (a) and (c) are 40 × 40 nm2. The dI/dU spectra are measured at the centers of different corrals before (b) and after (d) trapping Gd adatoms.
Mentions: Fe and Gd adatoms are deposited onto Ag(111) and the Fe nanocorrals are built via atom manipulation. As demonstrated previously33, stable open nanocorrals on the Ag(111) surface can be built with Fe adatoms that have a favorable diffusion barrier. Figure 1(a) shows the STM image of a 2 × 2 array of open Fe corrals with four different diameters (7.5, 8.5, 9.8 and 10.5 nm) on Ag(111). The image size is 40 × 40 nm2. Two neighboring corrals are separated by 20 nm. In order to study the influence on the electronic properties due to Gd atomic trapping, we first performed spectroscopy at the center of each corral as a reference. The spectroscopy was measured for more than ten times. The average curve and statistical error were plotted in Fig. 1(b). Two characteristic peaks are observed that shift to lower energy with increasing corral diameter. We note that Gd adatoms are driven out of the scanning area with this scanning condition (−0.5 V, 1 nA)33.

Bottom Line: The single peak position is close to the higher energy peak of the empty corrals.These findings, attributed to quantum confinement of the corrals and Gd structures trapped inside, are supported by tight-binding calculations.This demonstrates and provides insights into atom trapping in open corrals of various diameters, giving an alternative approach to modify the properties of nano-objects.

View Article: PubMed Central - PubMed

Affiliation: National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, 22 Hankou Road, Nanjing 210093, People's Republic of China.

ABSTRACT
Low dimensional nanostructures have attracted attention due to their rich physical properties and potential applications. The essential factor for their functionality is their electronic properties, which can be modified by quantum confinement. Here the electronic states of Gd atom trapped in open Fe corrals on Ag(111) were studied via scanning tunneling spectroscopy. A single spectroscopic peak above the Fermi level is observed after Gd adatoms are trapped inside Fe corrals, while two peaks appear in empty corrals. The single peak position is close to the higher energy peak of the empty corrals. These findings, attributed to quantum confinement of the corrals and Gd structures trapped inside, are supported by tight-binding calculations. This demonstrates and provides insights into atom trapping in open corrals of various diameters, giving an alternative approach to modify the properties of nano-objects.

No MeSH data available.