Drichko Lab

Raman Spectroscopy Group and Users Center

The Raman spectroscopy group is focused on studies of charge and spin ordered ground states in strongly correlated electron systems. Our current aim is to investigate them with Raman spectroscopy to find general behavior for materials of different chemical origin (both organic and inorganic).

Click here if you are interested in the Johns Hopkins Raman Users Center.

Publications of our group can be found at Google Scholar


May 2022

Shreenanda Ghoch has started her posdoc position. Welcome, Shreenanda!

May 2022

Our paper with Predrag Nikolic on elecectronic scattering of Nd2Ir2O7 and Pr2Ir2o7 demonstrating how Raman scattering can prove Weyl and Luttinger semimetals is now on arxiv: Weyl-Luttinger phase transition in pyrochlore iridates revealed by Raman scattering

March 2022

Yu Fei Liu, an undergraduate majoring in physics, is joining our group for an undergraduate research project.

Welcome, Yu Fei!

January 2022

Gwen Tsai, who is an engineering major and was taking an internship in our lab in 2019 just won a Brooke Owens Fellowship . A story about Gwen's work is here.

September 2021

Jackson Davis joined our group to study molecular quantum materials using Raman spectroscopy.

Welcome, Jackson!

May-October 2021

Paper by Y. Xu et al "Importance of dynamic lattice effects for crystal field excitations in quantum spin ice candidate Pr2Zr2O7" is published in Phys.Rev. B.

Paper by Y. Xu et al "Phonon spectrum of Pr2Zr2O7 and Pr2Ir2O7 as an evidence of coupling of the lattice with electronic and magnetic degrees of freedom" is now on arxiv

Results of Natalia's sabbatical at ISSP, Tokyo and collaboration with Minoru Yamashita, ISSP, Shinya Uji, NIMS, and Chisa Hotta, University of Tokyo is published in npj Quantum Materials:

"Ferromagnetism out of charge fluctuation of strongly correlated electrons in κ-(BEDT-TTF)2Hg(SCN)2Br"

February 2021

Our paper by Y. Xu et al "Importance of dynamic lattice effects for crystal field excitations in quantum spin ice candidate Pr2Zr2O7" is now on arxiv.

We use Raman spectroscopy to uncover dynamic interactions of the lattice of Pr2Zr2O7 with crystal field excitations of Pr atom.

We show how we can probe the ground state splitting by measuring a transition to the first excited state

February 2021

Arman Jasuja, an undergraduate majoring in physics is joining group to work on Raman spectroscopy of molecular quantum materials.

Welcome, Arman!

January 2021

Miranda Lorenzo, an undergraduate majoring in biophysics is joining our collaboration with Komalavalli Thirunavukkuarasu at National high Magnetic Fields Lab. She will be a part of our effort to study organic Mott insulators with high field ESR.

Welcome, Miranda!

November 2020

Our paper "Impact of the lattice on magnetic properties and possible spin nematicity in the S=1 triangular antiferromagnet NiGa2S4" is published in Phys. Rev. Letters.

Many theoretical papers discuss a possibility for nematic order driven by quadrupole interactions in NiGa2S4. Using Raman spectroscopy, we identify a phonon which can produce quadrupole interactions by modulation of the nearest neighbor magnetic exchange.

September 2020

Jesse Liebman joined our group to work on understanding of a connection between organic-based dipole liquid and spin liquid.

Welcome, Jesse!

September 2020

Our joint paper with collaborators from the University of Tokyo and NIMS, Tsukuba "Ferromagnetism out of charge fluctuation of strongly correlated electrons in κ-(BEDT-TTF)2Hg(SCN)2Br" is now on arxiv.

Here we present experimental studies of magnetic properties of the quantum dipole liquid κ-(BEDT-TTF)2Hg(SCN)2Br. We observe a rise of ferromagnetic correlations as dipole fluctuations develop. We suggest how charge fluctuations in an intrinsically inhomogeneous system close to a phase transition can lead too ferromagnetic interactions.

March 2020

Our paper "Melting of charge order in the low-temperature state of an electronic ferroelectric" is published in npj Quantum Materials

In this work we demonstrate a unique re-entrant transition in a Mott insulator on a weakly anisotropic triangular lattice κ-(BEDT-TTF)2Hg(SCN)2Cl. Using Raman spectroscopy, we observe how a charge ordered ferroelectric looses the order on cooling to low temperatures.

January 2020

Gwen is presenting a poster on her results at APS Conference for Undergraduate Women in Physics. Gwen project on identification of micro particles which contaminate human tissue is carried out in collaboration with JH School of Public Health.

December 2019

A paper of our collaborators from Tom Kempa's lab is published in Nature Nanomaterials.

Tom and his group learned how to control dimensionality of MoS2 structures by a substrate on which a film is growing. Photoluminescence and Raman scattering measured in our lab were one of the principle ways to characterize 1D MoS2 filaments and their electronic structure.

September 2019

Natalia gives an invited talk on "Melting of charge order in the low-temperature state of an electronic ferroelectric κ-(BEDT-TTF)2Hg(SCN)2Cl" at ISCOM2019.

June 2019

Chris Hennighausen is an undergraduate student in Boston University majoring in physics. Chris joined our group for summer and is helping us to set up our new lab

Welcome, Chris!

June 2019

Mae Rowland, a student from Maryland Institute College of Art (MICA) and an artist in residence in HEMI has joined our group for summer. Mae wants to learn about light and how incorporate various light effects into her art .

Welcome, Mae!

June 2019

Gwen Tsai, an undergraduate majoring in Chemical Engineering joined our group for a summer research project. Gwen will use micro-Raman scattering to look for microplastic particles in environmental samples. This project is run in collaboration with JHU School of Public Health.

Welcome, Gwen!

May 2019

We moved to a new large lab space!!! Now we are located in room 140, Bloomberg

March 2019

Our new paper on SmB6, a collaboration with quantum chemists (group of Prof. A. Alexandrova, UCLA) is submitted to the arxiv: https://arxiv.org/abs/1903.10650.

Our work shows that B6 cage is not as rigid and irrelevant to the properties of SmB6 as was thought before. Starting with a small cluster, calculations show how borons from neighboring unit cells can be considered as a B2 cluster. A variation of the length of bond in this pair creates two potential minima, for Sm2+ and Sm3+. Our Raman scattering data support the findings on a coupling of boron motion to the electronic bands of Sm. This approach could be a key to explain the mixed valence state of SmB6, its heat capacity, and many other properties.

Our paper on quantum dipole liquid state is published in Science magazine.

N. Hassan, S. Cunningham, M. Mourigal, E. I. Zhilyaeva, S. A. Torunova, R. N. Lyubovskaya, J. Schlueter, N. Drichko. "Evidence for a quantum dipole liquid state in an organic quasi-two-dimensional material", Science 360, 1101 (2018).