Atom-By-Atom Extraction Using the Scanning Tunneling Microscope Tip-Cluster Interaction

Deshpande, Aparna; Yıldırım, Handan; Kara, Abdelkader; Acharya, Danda; Vaughn, Joel; Rahman, Talat S.; Hla, Saw‐Wai

doi:10.1103/physrevlett.98.028304

Cited by 32 publications

(21 citation statements)

References 19 publications

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“…For nearly zero voltage the duty cycle reaches values close to 100% reflecting the propensity of the adatom to stay in the vicinity of the tip apex. This observation is in agreement with molecular‐dynamics simulations of tip‐induced lateral atom manipulation at zero voltage 81, 82. Yildirim et al 81 showed that Ag (Cu) adatoms on Ag(111) [Cu(111)] follow the lateral trajectory of the tip apex even in the absence of an applied voltage between tip and sample.…”

Section: Resultssupporting

confidence: 75%

Conductance of Ag atoms and clusters on Ag(111): Spectroscopic and time‐resolved data

Sperl¹,

Berndt²

2010

Physica Status Solidi (b)

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The evolution of the electronic structure of linear atomic Ag chains on Ag(111) has been explored atom by atom using lowtemperature scanning tunnelling microscopy and spectroscopy. Electronic states confined to the linear chains are well described within a particle-in-a-box model. The evolution of an unoccupied Ag monomer resonance during the synthesis of an Ag dimer reveals that the Ag-Ag interaction is predominantly direct owing to the large spatial extension of p wave functions of the adsorbed atoms. The hopping dynamics of a single Ag atom adsorbed on Ag(111) have been monitored by time-resolved two-level conductance fluctuations of the tunnel junctions. Effective temperatures of the junction and diffusion barrier heights in the presence of the tip were extracted from a voltage-dependent analysis of the fluctuation rate.

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Section: Resultssupporting

confidence: 75%

Conductance of Ag atoms and clusters on Ag(111): Spectroscopic and time‐resolved data

Sperl¹,

Berndt²

2010

Physica Status Solidi (b)

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“…Realization of atomic-sized metal or metal-molecule electronics devices 1-4 requires a fundamental understanding of conditions under which conductance quantization prevails, 5 their electronic structure and regulation of electron transmission behavior, [6][7][8][9][10][11][12][13][14][15][16][17][18][19] and their mechanical stability against disruptive forces of entropic thermal fluctuations. [20][21][22][23] In addition, positioning and manipulation of individual atoms requires a basic understanding of operative forces [24][25][26][27] and an ability to measure them. [28][29][30][31][32][33][34][35][36][37] Quantization of conductance was first shown experimentally in a two-dimensional electron gas.…”

Section: Introductionmentioning

confidence: 99%

Channel saturation and conductance quantization in single-atom gold constrictions

et al. 2010

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Notwithstanding the discreteness of metallic constrictions, it is shown that the finite elasticity of stable, single-atom gold constrictions allows for a continuous and reversible change in conductance, thereby enabling observation of channel saturation and conductance quantization.The observed channel saturation and signature for conductance quantization is achieved by superposition of atomic/subatomic-scale oscillations on a retracting/approaching gold tip against a gold substrate of a scanning probe. Results also show that conductance histograms are neither suitable for evaluating the stability of atomic configurations through peak positions or peak height nor appropriate for assessing conductance quantization. A large number of atomic configurations with similar conductance values give rise to peaks in the conductance histogram.The positions of the peaks and counts at each peak can be varied by changing the conditions under which the histograms are made. Histogram counts below 1 cannot necessarily be assumed to arise from single-atom constrictions.1

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“…This verifies that the process is relatively independent of the electric field. It is also known that the presence of the tip can modify the surface potential creating a lower potential region underneath [STR91, KUR99,DES] ( Fig.5.9b). This effect can be considered for some conformations in which the tip position is closer to a specific conformation rather than other.…”

Section: Molecular Switchmentioning

confidence: 99%

Single Molecule Switches and Molecular Self-Assembly: Low Temperature STM Investigations and Manipulations

Iancu

2006

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IANCU, VIOLETA, Ph.D., August 2006, Physics SINGLE MOLECULE SWITCHES AND MOLECULAR SELF-ASSEMBLY: LOW TEMPERATURE STM INVESTIGATIONS AND MANIPULATIONS (98 pp.) Director of Dissertation: Saw W. Hla This dissertation is devoted to single molecule investigations and manipulations of two porphyrin-based molecules, chlorophyll-a and Co-porphyrin. The molecules are adsorbed on metallic substrates and studied at low temperatures using a scanning tunneling microscope. The electronic, structural and mechanical properties of the molecules are investigated in detail with atomic level precision. Chlorophyll-a is the key ingredient in photosynthesis processes while Co-porphyrin is a magnetic molecule that represents the recent emerging field of molecular spintronics. Using the scanning tunneling microscope tip and the substrate as electrodes, and the molecules as active ingredients, single molecule switches made of these two molecules are demonstrated. The first switch, a multiple and reversible mechanical switch, is realized by using chlorophylla where the energy transfer of a single tunneling electron is used to rotate a C-C bond of the molecule's tail on a Au(111) surface. Here, the detailed underlying switching mechanisms are uncovered from the statistical analyses conducted over 1200 switching events together with the support of geometrically relaxed parametric calculations. The second switch, a spintronic switch, uses Co-porphyrin conformational changes to tune the spin-electron interaction between the Co atom and Cu(111) electrons. A change in the molecular conformation, from saddle to planar, leads to enhanced spin-electron coupling strength, and consequently, elevated Kondo temperatures. Self-assembly process is exploited for both the molecules and the analyses reveal important information regarding the layer growth and the electronic differences that appear due to the modified moleculesubstrate environment. Approved: Saw W. Hla Associate Professor of Physics and Astronomy to my family I would like to take a moment now and thank all the people that directly and indirectly have made possible for me to reach this stage of my professional life.

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Atom-By-Atom Extraction Using the Scanning Tunneling Microscope Tip-Cluster Interaction

Cited by 32 publications

References 19 publications

Conductance of Ag atoms and clusters on Ag(111): Spectroscopic and time‐resolved data

Conductance of Ag atoms and clusters on Ag(111): Spectroscopic and time‐resolved data

Channel saturation and conductance quantization in single-atom gold constrictions

Single Molecule Switches and Molecular Self-Assembly: Low Temperature STM Investigations and Manipulations

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