Nanoanalytics

Single-atom manipulation by low-temperature scanning tunneling microscopy

Low-temperature scanning tunneling microscopy is used to investigate and control quantum phenomena in individual nanostructures on III-V semiconductor surfaces. This technique combines the capabilities of local spectroscopy, local excitation by inelastic electron tunneling, manipulation of single atoms and molecules, and atom-by-atom assembly of artificial structures with sub-angstrom accuracy. Model systems of interest include structures with predefined size, geometry and chemical composition consisting of a small number of atoms and/or molecules and range down to single atoms, atomic surface vacancies and molecules interacting with their solid-state environment. Our goal is to explore new functions based on switching and conduction processes, quantization effects, and magnetic behavior at the atomic scale. Our latest research activities include the construction of quantum dot assemblies (quantum dot “molecules”) and quantum rings whose electronic level structure has no intrinsic variation but can nonetheless be tuned over a wide range. In addition, we study single organic molecules and STM-engineered adatom-molecule complexes on semiconductors acting as binary switches and tunable single-molecule transistors.

 

 

Fig. 1. 3D-rendered STM image of a quantum dot molecule with threefold symmetry consisting of three 6-atom indium chains on InAs(111)A (left). The molecular symmetry is deliberately lifted by a stepwise displacement of the horizontal chain (right-hand side images).
Fig. 2. Gray-scale STM images showing the stepwise assembly of a hexagonal ring composed of 30 In adatoms on InAs(111)A with an interatomic spacing of 1.48 nm. For the completed ring (right-hand side image) tunneling spectroscopy measurements reveal the generic level structure of a quantum ring, including its single ground state and doubly degenerate excited states.

Selected Publications

10 Author V. D. Pham , K. Kanisawa , S. Fölsch
Title

Quantum rings engineered by atom manipulation

Source Phys. Rev. Lett. , 123 , 066801 ( 2019 )
DOI : 10.1103/PhysRevLett.123.066801 | Download: PDF | 3103 Cite : Bibtex RIS
V. D. Pham, K. Kanisawa, and S. Fölsch

9 Author Y. Pan , K. Kanisawa , N. Ishikawa , S. Fölsch
Title

Scanning tunnelling spectroscopy and manipulation of double-decker phthalocyanine molecules on a semiconductor surface

Source J. Phys.: Condens. Matter , 29 , 364001 ( 2017 )
DOI : 10.1088/1361-648X/aa7dc4 | 2919 Cite : Bibtex RIS
Y. Pan, K. Kanisawa, N. Ishikawa, and S. Fölsch

8 Author Y. Pan , K. Kanisawa , S. Fölsch
Title

Creating and probing quantum dot molecules with the scanning tunneling microscope

Source JVST B , 35 , 04F102 ( 2017 )
DOI : 10.1116/1.4979848 | 2898 Cite : Bibtex RIS
Y. Pan, K. Kanisawa, and S. Fölsch

7 Author Y. Pan , J. Yang , S. C. Erwin , K. Kanisawa , S. Fölsch
Title

Reconfigurable quantum-dot molecules created by atom manipulation

Source Phys. Rev. Lett. , 115 , 076803 ( 2015 )
DOI : 10.1103/PhysRevLett.115.076803 | Download: PDF | 2718 Cite : Bibtex RIS
Y. Pan, J. Yang, S. C. Erwin, K. Kanisawa, and S. Fölsch

6 Author J. Martinez-Blanco , C. Nacci , S.C. Erwin , K. Kanisawa , E. Locane , M. Thomas , F. von Oppen , P.W. Brouwer , S. Fölsch
Title

Gating a single-molecule transistor with individual atoms

Source Nat. Phys. , 11 , 640 ( 2015 )
DOI : 10.1038/nphys3385 | 2700 Cite : Bibtex RIS
J. Martinez-Blanco, C. Nacci, S.C. Erwin, K. Kanisawa, E. Locane, M. Thomas, F. von Oppen, P.W. Brouwer, and S. Fölsch

5 Author S. Fölsch , J. Martinez-Blanco , J. Yang , K. Kanisawa , S. C. Erwin
Title

Quantum dots with single-atom precision

Source Nature Nanotechnol. , 9 , 505 ( 2014 )
DOI : 10.1038/NNANO.2014.129 | 2491 Cite : Bibtex RIS
S. Fölsch, J. Martinez-Blanco, J. Yang, K. Kanisawa, and S. C. Erwin

4 Author J. Yang , C. Nacci , J. Martinez-Blanco , K. Kanisawa , S. Fölsch
Title

Vertical manipulation of native adatoms on the InAs(111)A surface

Source J. Phys.: Condens. Matter , 24 , 354008 ( 2012 )
2308 Cite : Bibtex RIS
J. Yang, C. Nacci, J. Martinez-Blanco, K. Kanisawa, and S. Fölsch

3 Author C. Nacci , S. C. Erwin , K. Kanisawa , S. Fölsch
Title

Controlled switching within an organic molecule deliberately pinned to a semiconductor surface

Source ACS Nano , 6 , 4190 ( 2012 )
2300 Cite : Bibtex RIS
C. Nacci, S. C. Erwin, K. Kanisawa, and S. Fölsch

2 Author J. Yang , S. C. Erwin , K. Kanisawa , C. Nacci , S. Fölsch
Title

Emergent multistability in assembled nanostructures

Source Nano Lett. , 11 , 2486 ( 2011 )
2210 Cite : Bibtex RIS
J. Yang, S. C. Erwin, K. Kanisawa, C. Nacci, and S. Fölsch

1 Author S. Fölsch , J. Yang , C. Nacci , K. Kanisawa
Title

Atom-by-atom quantum state control in adatom chains on a semiconductor

Source Phys. Rev. Lett. , 103 , 096104 ( 2009 )
Download: PDF | 2010 Cite : Bibtex RIS
S. Fölsch, J. Yang, C. Nacci, and K. Kanisawa

Contact

Dr. Achim Trampert

Head of Department 

+49 30 20377-280

trampert@pdi-berlin.de