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Related Concept Videos

Chirality02:25

Chirality

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Chirality is a term that describes the lack of mirror symmetry in an object. In other words, chiral objects cannot be superposed on their mirror images. For example, our feet are chiral, as the mirror image of the left foot, the right foot, cannot be superposed on the left foot.
Chiral objects exhibit a sense of handedness when they interact with another chiral object. For example, our left foot can only fit in the left shoe and not in the right shoe. Achiral objects — objects that have...
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Molecules with Multiple Chiral Centers02:25

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Molecules that possess multiple chiral centers can afford a large number of stereoisomers. For instance, while some molecules like 2-butanol have one chiral center, defined as a tetrahedral carbon atom with four different substituents attached, several molecules like butane-2,3-diol have multiple chiral centers. A simple formula to predict the number of stereoisomers possible for a molecule with n chiral centers is 2n. However, there can be a lower number where some of the stereoisomers are...
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Chirality at Nitrogen, Phosphorus, and Sulfur02:30

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Chirality is most prevalent in carbon-based tetrahedral compounds, but this important facet of molecular symmetry extends to sp3-hybridized nitrogen, phosphorus and sulfur centers, including trivalent molecules with lone pairs. Here, the lone pair behaves as a functional group in addition to the other three substituents to form an analogous tetrahedral center that can be chiral.
A consequence of chirality is the need for enantiomeric resolution. While this is theoretically possible for all...
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Prochirality02:05

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The concept of prochirality leads to the nomenclature of the individual faces of a molecule and plays a crucial role in the enantioselective reaction. It is a concept where two or more achiral molecules react to produce chiral products. A typical process is the reaction of an achiral ketone to generate a chiral alcohol. Here, the achiral reactant reacts with an achiral reducing agent, sodium borohydride, to generate an equimolar mixture of the chiral enantiomers of the product. For example, an...
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Chirality in Nature02:30

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Chirality is the most intriguing yet essential facet of nature, governing life’s biochemical processes and precision. It can be observed from a snail shell pattern in a macroscopic world to an amino acid, the minutest building block of life. Most of the snails around the world have right-coiled shells because of the intrinsic chirality in their genes. All the amino acids present in the human body exist in an enantiomerically pure state, except for glycine - the sole achiral amino acid.
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Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

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NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of one, the...
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Topological surface states protected from backscattering by chiral spin texture.

Pedram Roushan1, Jungpil Seo, Colin V Parker

  • 1Joseph Henry Laboratories & Department of Physics, Princeton University, Princeton, New Jersey 08544, USA.

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|August 12, 2009
PubMed
Summary
This summary is machine-generated.

Topological insulators possess unique surface states insensitive to scattering, protecting electron spin. This research confirms this protection in Bi(1-x)Sb(x), paving the way for advanced spintronics and quantum computing.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Mechanics

Background:

  • Topological insulators are novel materials with insulating bulk and conducting surface states.
  • These surface states exhibit unique spin textures due to strong spin-orbit coupling.
  • A key prediction is their robustness against scattering, preventing backscattering and localization.

Purpose of the Study:

  • To experimentally investigate the scattering properties of surface states in three-dimensional topological insulators.
  • To examine the influence of disorder on the chiral surface states in Bi(1-x)Sb(x).
  • To validate the theoretical prediction of scattering insensitivity in these topological materials.

Main Methods:

  • Utilized scanning tunnelling spectroscopy (STS) to probe surface states.
  • Employed angle-resolved photoemission spectroscopy (ARPES) for detailed electronic structure analysis.
  • Investigated Bi(1-x)Sb(x) samples with controlled atomic-scale disorder from alloying.

Main Results:

  • Visualized the gapless surface states in the three-dimensional topological insulator Bi(1-x)Sb(x).
  • Observed the absence of backscattering between surface states of opposite momentum and spin, despite significant disorder.
  • Demonstrated that the chiral nature of these states effectively protects the spin of charge carriers.

Conclusions:

  • The chiral surface states in topological insulators are robust against scattering, confirming theoretical predictions.
  • This spin protection is crucial for potential applications in spintronics and quantum computing.
  • The findings highlight the potential of topological insulators for fault-tolerant quantum information processing.