81 citations · 170 across the 12 of their papers we have counts for
12 papers
Critical behavior of the dimerized Si(001) surface: Continuous order-disorder phase transition in the two-dimensional Ising universality class
Christian Brand, Alfred Hucht, Hamid Mehdipour +8
The critical behavior of the order-disorder phase transition in the buckled dimer structure of the Si(001) surface is investigated both theoretically by means of first-principles c…
Dimer Coupling Energies of the Si(001) Surface
Christian Brand, Alfred Hucht, Giriraj Jnawali +6
The coupling energies between the buckled dimers of the Si(001) surface were determined through analysis of the anisotropic critical behavior of its order-disorder phase transition…
Evidence for Topological Band-to-Band Transitions in a Type-II Weyl Semimetal
Seyyedesadaf Pournia, Giriraj Jnawali, Samuel Linser +2
The ternary van der Waals material NbIrTe is a Type-II Weyl semimetal. We use a tunable circularly polarized mid-infrared laser to investigate the existence of band-to-band exc…
Band Splitting and Long-lived Carrier Recombination in Ferromagnetic CrSiTe3 Nanosheets
Giriraj Jnawali, Seyyedesadaf Pournia, Eli Zoghlin +4
Magnetic layered ternary chalcogenides hold great promise for future spin-optoelectronic devices in the two dimensional limit. Understanding how the properties of the materials are…
Band Structure and Polarization Effects in Photothermoelectric Spectroscopy of a Bi2Se3 Device
Seyyedesadaf Pournia, Giriraj Jnawali, Ryan F. Need +3
Bi2Se3 is a prototypical topological insulator which has a small band gap (~0.3 eV) and topologically protected conducting surface states. This material exhibits quite strong therm…
A Raman Probe of Phonons and Electron-phonon Interactions in NbIrTe4
Iraj Abbasian Shojaei, Seyyedesadaf Pournia, Congcong Le +6
The semimetal NbIrTe4 has been proposed to be a Type-II Weyl semimetal with 8 pairs of opposite Chirality Weyl nodes which are very close to the Fermi energy. This topological elec…
Ultrafast Photoinduced Band Splitting and Carrier Dynamics in Chiral Tellurium Nanosheets
Giriraj Jnawali, Yuan Xiang, Samuel M. Linser +10
Trigonal tellurium (Te) is a chiral semiconductor that lacks both mirror and inversion symmetries, resulting in complex band structures with Weyl crossings and unique spin textures…
Exploring the Band Structure of Wurtzite InAs Nanowires Using Photocurrent Spectroscopy
Seyyedesadaf Pournia, Samuel Linser, Giriraj Jnawali +8
We use polarized photocurrent spectroscopy in a nanowire device to investigate the band structure of hexagonal Wurtzite InAs. Signatures of optical transitions between four valence…
Strong Hot Carrier Effects Observed in a Single Nanowire Heterostructure
Iraj Abbasian Shojaei, Samuel Linser, Giriraj Jnawali +9
We use Transient Rayleigh Scattering to study the thermalization of hot photoexcited carriers in single GaAsSb/InP nanowire heterostructures. By comparing the energy loss rate in s…
Revealing Optical Transitions and Carrier Recombination Dynamics within the Bulk Band Structure of Bi2Se3
Giriraj Jnawali, Samuel Linser, Iraj Abbasian Shojaei +5
Bismuth selenide (Bi2Se3) is a prototypical three-dimensional topological insulator whose Dirac surface states have been extensively studied theoretically and experimentally. Surpr…
Graphene-Complex-oxide Nanoscale Device Concepts
Giriraj Jnawali, Hyungwoo Lee, Jung-Woo Lee +9
The integration of graphene with complex-oxide heterostructures such as LaAlO/SrTiO offers the opportunity to combine the multifunctional properties of an oxide interface w…
Room-temperature quantum transport signatures in graphene/LaAlO3/SrTiO3 heterostructures
Giriraj Jnawali, Mengchen Huang, Jen-Feng Hsu +6
The pseudospin quantum degree of freedom is one of the most remarkable properties of graphene that distinguishes it from ordinary two-dimensional metals and semiconductors. Pseudos…