Upcoming Talks and Events:
David D. Awschalom Affiliation: University of Chicago Date: Feb 16th, 2022; 10:00 - 11:00 (KST) / Feb 15th, 19:00 - 20:00 (CT) Developing quantum systems with semiconductors and molecules Our technological preference for perfection
David D. Awschalom
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Date: Feb 16th, 2022; 10:00 – 11:00 (KST) / Feb 15th, 19:00 – 20:00 (CT)
Developing quantum systems with semiconductors and molecules
Our technological preference for perfection can only lead us so far: as traditional transistor-
based electronics rapidly approach the atomic scale, small amounts of disorder begin to
have outsized negative effects. Surprisingly, one of the most promising pathways out of this
conundrum may emerge from current efforts to embrace defects to construct quantum
devices and machines that enable new information processing and sensing technologies
based on the quantum nature of electrons and atomic nuclei. Individual defects in diamond,
silicon carbide, and other wide-gap semiconductors have attracted interest as they possess
an electronic spin state that can be employed as a solid-state quantum bit at room
temperature. These systems have a built-in optical interface in the visible and telecom
bands, retain their coherence over millisecond timescales, and can be polarized,
manipulated, and read out using a simple combination of light and microwaves. We discuss
integrating single spin qubits into wafer-scale, commercial optoelectronic devices, extending
the coherence of these spin qubits, and demonstrating the control and entanglement of a
single nuclear spin with an electron spin.
Optically addressable spin qubits can also be created, engineered, and scaled through a
purely synthetic chemical approach. Moreover, these structures offer new opportunities to
construct hybrid systems. We demonstrate the optical initialization and readout, and
coherent control, of ground-state spins in organometallic molecules. This bottom-up
approach offers avenues to create designer qubits and to deploy the diverse capabilities of
chemical synthesis for scalable quantum technologies.
To participate in the talk, please, fill the Registration Form →
(Wednesday) 10:00 am - 11:00 am (KST) / (Tuesday) Feb15th, 19:00 - 20:00 (CT)
Past Talks and Events:
Danna Freedman Affiliation: F. G. Keyes Professor of Chemistry, Massachusetts Institute of Technology Date: Dec 16th, 2021; 10:00 - 11:00 (KST) / Dec 15th, 20:00 - 21:00 (EST) Chemically enabled atomistic design of
Affiliation: F. G. Keyes Professor of Chemistry, Massachusetts Institute of Technology
Date: Dec 16th, 2021; 10:00 – 11:00 (KST) / Dec 15th, 20:00 – 21:00 (EST)
Chemically enabled atomistic design of quantum systems
Quantum information science encompasses all areas in which quantum
control can impact the world around us. Applications range from
quantum computing, to quantum sensing, to quantum communications.
Within each of these areas the requirements for a “good” quantum unit
differ. Chemistry offers a unique approach to quantum information
science, whereby we can harness the atomistic precision inherent in
synthetic chemistry to create structurally precise, reproducible, and
tunable units. Results in this area will be presented including
creating molecules that are analogues of NV centers which we dub
molecular color centers. These molecules feature optical read-out of
spin information and offer significant promise in the realm of sensing
and potentially communication.
To participate in the talk, please, fill the Registration Form →
(Thursday) 10:00 am - 11:00 am (KST) / (Wednesday) Dec 15th, 21:00 - 22:00 (EST)
Richard A. Layfield Academic Affiliation: Department of Chemistry, School of Life Sciences, University of Sussex, UK Date and Time of the Talk: Nov 17th, 2021; 17:00 - 18:00 (KST) Axial Crystal
Richard A. Layfield
Academic Affiliation: Department of Chemistry, School of Life Sciences, University of Sussex, UK
Date and Time of the Talk: Nov 17th, 2021; 17:00 – 18:00 (KST)
Axial Crystal Fields and Single-Molecule Magnetism in Dysprosium Sandwich Compounds
Organometallic sandwich compounds play a leading role in the development of f-element chemistry. In addition to making significant contributions to our fundamental understanding of structure, bonding and reactivity in lanthanide and actinide compounds, organometallic sandwiches are used in catalysis and a variety of small-molecule activation processes.
The reactivity of f-element sandwich compounds often has no parallel with transition metals or main group elements and offers many opportunities for development. In contrast, the magnetic properties of f-element organometallics have not been studied extensively, which is surprising given the many applications of lanthanides in magnetic materials and related areas, such as MRI. This is particularly true in the case of single-molecule magnets (SMMs), a family of compounds that show magnet-like behaviour below a characteristic blocking temperature.
Since 2010, we have developed a large family of dysprosium SMMs based on the metallocene structural unit. We have applied our findings to develop a working model that allows the magnetic blocking temperature to be increased in a rational way. The culmination of our work is a dysprosium metallocene SMM with a blocking temperature of 80 K, which is (currently) the only example to function above liquid nitrogen temperatures.
Using our structure-property relationship, we are now focused on improving the SMM properties further. To do this, our attention has shifted toward a ligand that is well-known in transition metal chemistry but is extremely rare in the f-block: the strained ring species cyclobutadienyl (see image, above right). In this seminar I will present our recent findings in this area, showing how the beastly [4-C4(SiMe3)4]2– ligand can be tamed with appropriate control of the chemical conditions.
(Wednesday) 5:00 pm - 6:00 pm KST