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Soumyajit Sarkar
Weizmann Institute of Science
32Publications
8H-index
173Citations
Publications 32
Newest
Controlled modification of the semiconductor surface work function is of fundamental importance for improvements in the efficiency of (opto-)electronic devices. Binding amino acids to a semiconductor surface through their common carboxylic group offers a versatile tool for modulation of surface properties by the choice of their side chain. This approach is demonstrated here by tailoring the surface work function of indium tin oxide, one of the most abundant transparent electrodes in organic opto...
#1Koyel Banerjee-Ghosh (Weizmann Institute of Science)H-Index: 2
#2Oren Ben Dor (HUJI: Hebrew University of Jerusalem)H-Index: 5
Last.Leeor Kronik (Weizmann Institute of Science)H-Index: 52
view all 13 authors...
It is commonly assumed that recognition and discrimination of chirality, both in nature and in artificial systems, depend solely on spatial effects. However, recent studies have suggested that charge redistribution in chiral molecules manifests an enantiospecific preference in electron spin orientation. We therefore reasoned that the induced spin polarization may affect enantiorecognition through exchange interactions. Here we show experimentally that the interaction of chiral molecules with a p...
#1Soumyajit Sarkar (Weizmann Institute of Science)H-Index: 8
#2Jing Yang (UPenn: University of Pennsylvania)H-Index: 3
Last.Leeor Kronik (Weizmann Institute of Science)H-Index: 52
view all 5 authors...
We compare electronic structure characteristics of three different kinds of benzene-adsorbed (111) surfaces: that of Bi2Te3, a prototypical topological insulator, that of Au, a prototypical inert metal, and that of Pt, a prototypical catalytic metal. Using first-principles calculations based on dispersion-corrected density functional theory, we show that benzene is chemisorbed on Pt, but physisorbed on Au and Bi2Te3. The adsorption on Bi2Te3 is particularly weak, consistent with a minimal pertur...
#1Cunlan Guo (Weizmann Institute of Science)H-Index: 12
#2Soumyajit Sarkar (Weizmann Institute of Science)H-Index: 8
Last.Satoshi Kera (Chiba University)H-Index: 30
view all 14 authors...
Peptide-based molecular electronic devices are promising due to the large diversity and unique electronic properties of biomolecules. These electronic properties can change considerably with peptide structure, allowing diverse design possibilities. In this work, we explore the effect of the side-chain of the peptide on its electronic properties, by using both experimental and computational tools to detect the electronic energy levels of two model peptides. The peptides include 2Ala and 2Trp as w...
#1Soumyajit Sarkar (Weizmann Institute of Science)H-Index: 8
#2Leeor Kronik (Weizmann Institute of Science)H-Index: 52
ABSTRACTWe provide a quantitative examination of the ionisation potential, protonation, and de-protonation energies of a set of 22 different amino acids. Specifically, we compare results obtained using the conventional hybrid functionals B3LYP and BHLYP (which use 20% and 50% of Fock exchange, respectively) with those obtained from the recently developed optimally tuned range-separated hybrid (OT-RSH) functional approach, as well as to literature coupled-cluster calculations with single and doub...
#2Eyal CapuaH-Index: 8
Last.Ron NaamanH-Index: 40
view all 10 authors...
Chirality-induced spin selectivity is a recently-discovered effect, which results in spin selectivity for electrons transmitted through chiral peptide monolayers. Here, we use this spin selectivity to probe the organization of self-assembled α-helix peptide monolayers and examine the relation between structural and spin transfer phenomena. We show that the α-helix structure of oligopeptides based on alanine and aminoisobutyric acid is transformed to a more linear one upon cooling. This process i...
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