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Location
215 Sharp Lab
Speaker
So Takei, CUNY
We propose two platforms for realizing macroscopic spintronics qubits. The first prototype magnetic quantum information processing device, based on spin superfluidity and spin Hall phenomena, realizes the spin-supercurrent analog of the superconducting phase qubit, and allows for full electrical control and readout. The second device stores a quantum state in a topological defect of a magnetic insulator and realizes the magnetic analog of the three-level rf-SQUID qubit.
Location
SHL 215
Speaker
Vasili Perebeinos, SUNY Buffalo
Host
Nikolic
In recent years, 2D materials, such transition metal dichalcogenides, have attracted much attention due to their excellent transport and optical properties. Using a Bethe-Salpeter equation, we investigate optical and excitonic properties of MoS2 monolayers in an applied in-plane electric field [1]. We predict a quadratic Stark shift and its scaling with the exciton binding energy, determined by the dielectric environment. I will also discuss our recent results on plasmon scaling in graphene nanoribbon arrays as a function of nanoribbon width, spacing between ribbons, and doping level [2].
Location
SHL 215
Speaker
Lyubov Titova, Worcester Polytechnic Institute
Host
Nikolic

Two-dimensional, or 2D, materials are attracting considerable attention as a testbed for new physics and as candidates for applications in flexible nanoscale high-speed optoelectronics, solar energy conversion, and chemical sensing. Most unique properties of 2D materials stem from their highly anisotropic optical and electronic properties. Terahertz (THz) spectroscopy provides access to those properties with ultra-high time resolution and without the complications of electrical contacts.

Location
SHL215
Speaker
Sergey Frolov
Host
Nikolic
Majorana fermions are non-trivial quantum excitations that have remarkable topological properties and can be used to protect quantum information against decoherence. Tunneling spectroscopy measurements on one-dimensional superconducting hybrid materials have revealed signatures of Majorana fermions which are the edge states of a bulk topological superconducting phase. We couple strong spin-orbit semiconductor InSb nanowires to conventional superconductors (NbTiN, Al) to obtain additional signatures of Majorana fermions and to explore the topological phase transition.
Date
Time
2:30PM
Location
SHL215
Speaker
Dr. Dmytro A. Bozhko, University of Kaiserslautern
Host
Jungfleisch

Finding new ways for fast and efficient processing and transfer of data is one the most challenging tasks nowadays. Elementary spin excitations - magnons (spin wave quanta) - open up a very promising direction of high-speed and low-power information processing [1]. Magnons are bosons, and thus they are able to form spontaneously a spatially extended, coherent ground state, a Bose-Einstein condensate (BEC), which can be established independently of the magnon excitation mechanism even at room temperature.

Date
Time
2:30pm
Location
215 Sharp Lab
Speaker
Dr. Sergi Lendinez, Argonne National Laboratory
Host
Jungfleisch

Localized magnetic configurations such as magnetic vortices and magnetic droplet solitons are great subjects for applications and fundamental understanding of spin dynamics since they can be controlled with external fields, electrical currents, and microwave excitations. Magnetic vortices are the ground state of certain micropatterned structures, whereas magnetic droplet solitons are created in an extended magnetic thin film by local excitation of spin waves. However, damping works against the formation of stable magnetic droplet solitons, and their stability is more challenging.

Date
Time
2:30pm
Location
215 Sharp Lab
Speaker
Dr. Vivek Shenoy, University of Pennsylvania
Host
Chui

Much of our understanding of the biological mechanisms that underlie cellular functions, such as migration, differentiation and force sensing has been garnered from studying cells cultured on two-dimensional (2D) substrates. In the recent years there has been intense interest and effort to understand cell mechanics in three-dimensional (3D) cultures, which more closely resemble the in vivo microenvironment. However, a major challenge unique to 3D settings is the dynamic feedback between cells and their surroundings.

Date
Time
2:00pm
Location
Room 215
Speaker
Professor Keivan Esfarjani, University of Virginia
Host
Chui

In this talk, we summarize the formalism we have developed to model heat transport in crystalline solids from first-principles density functional theory. We will illustrate the success of this approach by the results obtained for PbTe. In the second part, we will discuss the possibility of using 2D layered materials for converting heat to electricity in a solid-state thermionic device.

Date
Time
2:30pm
Location
215 Sharp Lab
Speaker
Dr. Dimitris Niarchos, Emeritus Director of Research, Scientific Advisor Amen Technologies
Host
Hadjipanayis

One of the principal advantages of thermoelelectric devices is their ability to convert heat into electricity and vice versa without any moving parts. Thermoelectric power generation is based on the Seebeck effect, where a voltage is induced when a semiconductor is under temperature gradient. In last two decades, a great effort has been made to enhance the range of high-performance thermoelectric materials for industrial applications [1-3].