Jyoti Katoch
Assistant Professor | Carnegie Mellon University
Pittsburgh, PA, UNITED STATES
Jyoti Katoch investigates the electronic, optical and spin dependent properties of novel quantum systems.
Biography
Jyoti Katoch investigates the electronic, optical and spin dependent properties of novel quantum systems such as two-dimensional layered materials and three-dimensional Dirac semimetals. She has expertise in controlling the properties of quantum materials using atomic scale modifications (adatoms, heterostructures, proximity effects, etc.) with an intent to tweak their properties on demand, as well as explore novel physical phenomena emerging from such modifications. Her research focuses on using two different experimental approaches for the fabrication of novel quantum systems: polymer-based mechanical assembly techniques to obtain atomically precise heterostructures of van der Waals materials and molecular beam epitaxy growth method for larger area thin films of quantum materials. Her group utilizes the state-of-the-art in-operando angle-resolved photoemission spectroscopy with sub 100 nm spatial resolution (nanoARPES) to obtain momentum resolved view of the electronic structure of fully functional devices based on quantum materials.
Areas of Expertise (6)
Quantum Materials
Quantum Systems
Photolithography
Atomic Force Microscopy (AFM)
Molecular Beam Epitaxy Growth Method
Polymer-based Mechanical Assembly Techniques
Media Appearances (1)
Carnegie Mellon's Jyoti Katoch Receives DOE Early Career Grant to Probe Quantum Matter
Carnegie Mellon University online
2019-08-01
"I am very excited about receiving a DOE early career research award," said Katoch, "It will enable my research group to perform cutting edge work on 2D quantum materials at the state-of-the-art MAESTRO beamline at the Advanced Light Source at Lawrence Berkeley National Laboratory. This award gives LIQUID group members an opportunity to venture into a new direction of performing in-operando angle-resolved photoemission spectroscopy with sub-100 nm spatial resolution on fully functional quantum devices at this beamline."
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Accomplishments (1)
DOE Early Career Research Award (professional)
2019
Education (2)
University of Central Florida: Ph.D., Physics
Panjab University: B.S, Physics, Mathematics and Chemistry
Links (3)
Languages (2)
- English
- Hindi
Articles (5)
In Operando Angle‐Resolved Photoemission Spectroscopy with Nanoscale Spatial Resolution: Spatial Mapping of the Electronic Structure of Twisted Bilayer Graphene
Small Science2021 To pinpoint the electronic and structural mechanisms that affect intrinsic and extrinsic performance limits of 2D material devices, it is of critical importance to resolve the electronic properties on the mesoscopic length scale of such devices under operating conditions. Herein, angle‐resolved photoemission spectroscopy with nanoscale spatial resolution (nanoARPES) is used to map the quasiparticle electronic structure of a twisted bilayer graphene device.
Accessing the spectral function in a current-carrying device
Physical Review Letters2020 The presence of an electrical transport current in a material is one of the simplest and most important realizations of nonequilibrium physics. The current density breaks the crystalline symmetry and can give rise to dramatic phenomena, such as sliding charge density waves, insulator-to-metal transitions, or gap openings in topologically protected states. Almost nothing is known about how a current influences the electron spectral function, which characterizes most of the solid’s electronic, optical, and chemical properties.
Momentum-resolved view of highly tunable many-body effects in a graphene/hBN field-effect device
Physical Review B2020 Integrating the carrier tunability of a functional two-dimensional material electronic device with a direct probe of energy-and momentum-resolved electronic excitations is essential to gain insights on how many-body interactions are influenced during device operation. Here, we use microfocused angle-resolved photoemission in order to analyze many-body interactions in back-gated graphene supported on hexagonal boron nitride. By extracting the doping-dependent quasiparticle dispersion and self-energy, we observe how these interactions renormalize the Dirac cone and impact the electron mobility of our device.
Direct observation of minibands in a twisted graphene/WS2 bilayer
Science Advances2020 Stacking two-dimensional (2D) van der Waals materials with different interlayer atomic registry in a heterobilayer causes the formation of a long-range periodic superlattice that may bestow the heterostructure with properties such as new quantum fractal states or superconductivity. Recent optical measurements of transition metal dichalcogenide (TMD) heterobilayers have revealed the presence of hybridized interlayer electron-hole pair excitations at energies defined by the superlattice potential. The corresponding quasiparticle band structures, so-called minibands, have remained elusive, and no such features have been reported for heterobilayers composed of a TMD and another type of 2D material.
Observation of electrically tunable van Hove singularities in twisted bilayer graphene from NanoARPES
Advanced Materials2020 The possibility of triggering correlated phenomena by placing a singularity of the density of states near the Fermi energy remains an intriguing avenue toward engineering the properties of quantum materials. Twisted bilayer graphene is a key material in this regard because the superlattice produced by the rotated graphene layers introduces a van Hove singularity and flat bands near the Fermi energy that cause the emergence of numerous correlated phases, including superconductivity. Direct demonstration of electrostatic control of the superlattice bands over a wide energy range has, so far, been critically missing.
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