Welcome to Xuan Gao’s Group Website

 

Welcome to the homepage of Professor Xuan Gao’s research group at the Physics Department of Case Western Reserve University. We are a group of experimental physicists studying a wide range of interesting subjects in the fast-growing field of nanoscale physics which bridges condensed matter physics and nanotechnology. Our research is centered on nanostructures or materials (quantum wells, nanoplates, nanowires etc) in which the quantum nature of particles (electrons, phonons etc) plays a fundamental role in their electrical, thermal, optical and magnetic properties. We seek to understand and exploit the quantum physics in these nanostructures for novel device applications.

 

Our current research projects include:

  1. Electron transport and phase transitions in correlated two-dimensional electron (or hole) system in semiconductor quantum wells.

  2. Quantum confinement, spin-orbit coupling, topology/symmetry protection effects in topological states of matter (topological insulators, Dirac semi-metals etc).

  3. Understanding the energy conversion processes in emerging materials relevant to renewable energy.

  4. Nanowires or graphene-like atomically thin semiconductors for next-generation nanoelectronics, optoelectronics, or biosensors.

Please visit our research projects webpage for more details.

 

What’s New


  • 10/2018 Our collaborative paper with UT Austin, “Effect of SrTiO3 oxygen vacancies on the conductivity of LaTiO3/SrTiOheterostructures“, is accepted by Journal of Applied Physics. Shuhao from our group contributed to the work. We thank Profs. Ekerdt and Demkov’s group for their collaboration and AFOSR for the funding support.

  • 10/2018 Kyle’s paper “α-MoO3 as a Conductive 2D Oxide: Tunable n-Type Electrical Transport via Oxygen Vacancy and Fluorine Doping” is accepted by ACS Applied Nano Materials. Well done! We thank AFOSR for funding this work.

  • 10/2018 Our latest paper on the new reentrant insulating phase (RIP) in correlated 2D systems appeared as a featured open-access review article in Applied Sciences. The authors include Richard (our honorable alumnus who discovered the RIP connected with the metal-insulator transition in low-density 2D holes in GaAs), Clara, and Shuhao. 

  • 9/2018 Clara (Chieh-Wen) published two insightful papers on topological crystalline insulator/band insulator SnTe/PbTe heterostructure, one in Physical Review B and the other in Nano Letters. We thank Profs. Zhidong Zhang and Song Ma of Chinese Academy of Sciences for their collaboration and NSF for funding our work.

  • Our paper “Intrinsic Electron Mobility Exceeding 1000 cm^2/(V s) in Multilayer InSe FETs“, Sucharitakul et al, Nano Letters, 15, 3815-3819 (2015) is recognized as a highly cited paper according to Web of Science (“As of 2018, this highly cited paper received enough citations to place it in the top 1% of the academic field of Physics based on a highly cited threshold for the field and publication year.” )

 

  • 6/14/2018 Xuan Gao has been promoted to the rank of full Professor. Many thanks to all the former and current group members for the contributions that helped Xuan achieving this!

 

 

  • 5/14/2018 Prof. Gao attends the AFOSR program review in Niceville, FL. A lot of nice discussions on 2D oxides!

 

  • 4/20/2018 Collaborative paper ” Role of the different defects, their population, and distribution in the LaAlO3/SrTiO3 heterostructure’s behavior” is published online. This paper was also selected as an editor’s pick by JAP.

 

  • 4/19/2018 Undergraduate student MoCun Ye is awarded a $4000 SURES summer research scholarship. We thank the Case Alumni Association for the support.

 

  • 4/13/2018 Undergraduate student Yang Han wins Japanese Speech Contest.  Well done!

 

  • 3/27/1028 Our new paper “Nanostructured SnSe: Synthesis, doping, and thermoelectric properties“, is published in Journal of Applied Physics (Liu et al, Journal of Applied Physics 123, 115109 (2018)). In this paper, we report the study of growth and thermoelectric characterization of nanostructured SnSe, a promising thermoelectric material for converting waste heat into electricity. This work also bridges thermoelectrics and graphene-like two-dimensional materials, two major directions in condensed matter and material physics research.

 

  • 3/20/2018 Shuhao Liu successfully defended his Ph.D. thesis. Congratulations!

 

  • 3/5-3/9/2018 Our group visited Los Angeles to attend the annual meeting of American Physical Society. Clara, Shuhao, Kasun, and Kyle each gave a talk and Prof. Gao chaired a session on semiconductor nanowires, nanorods, and nanotubes.

 

 

 

 

 

 

 

 

  • 2/18/2018 group dinner celebrating the lunar new year

 

 

 

 

 

 

 

 

 

  • 2/2/2018 Case Daily news about our new collaborative research grant on layered 2D oxides from AFOSR.

 

  • 10/8/2017 group lunch and foliage outing

 

 

 

 

 

 

 

 

 

  • 10/3/2017 Shuhao gave an invited talk (on behalf of Prof. Xuan Gao) at the 232nd ECS meeting on the thermoelectric properties of IV-VI monochalcogenide nanostructures, see abstract here.

 

  • 10/1/2017 Chieh-Wen (Clara) Liu joins our group as a postdoc scholar. Welcome, Clara! We also welcome undergraduate students Yang Han, Derek Tang who are doing their senior capstone projects in our group. Runtian Miao, a junior undergrad also started part-time research with our lab. Welcome, all!

 

  • 9/28/2017 Xuan Gao gave a Physics Colloquium on layered 2D semiconductor and topological insulator materials at Kent State University.

 

 

 

  • 6/2017 Sukrit’s paper “V2O5: a 2D van der Waals Oxide with Strong In-plane Electrical and Optical Anisotropy” was accepted for publication in ACS Applied Materials & Interfaces. In this work, we report the largest in-plane electrical transport anisotropy effect in 2D materials to date. This work was a collaboration with Prof. Lambrecht (CWRU), Prof. Rui He (Univ. Northern Iowa) and Prof. Hilde Poelman (Ghent University, Belgium).

 

 

 

 

 

 

 

 

 

  • 6/2017 We say farewell to Sukrit (Good luck to your new position at RIKEN!) and also welcome new graduate student Arvind Shankar joining our group.

  • 5/2017 UIUC undergraduate Ryuji Fujita will be working in our group for a month. welcome back, Ryuji.

  • 5/2017 Congratulations, Dr. Sucharitakul, the 4th Ph.D. from our lab!

 

 

 

 

 

 

 

  • 5/2017 Xuan Gao attended the annual AFOSR project review at the Kirtland Airforce Base in Albuquerque.

  • 4/2017 Undergraduate Physics major Mingyuan Wang receives a SOURCE/SURES research scholarship to do summer research in our lab. Congratulations!

 

  • 4/2017 An article about our scanning photocurrent mapping of carrier diffusion in organo-metal halide perovskite solar cell material is published in the ‘TECH BEAT’ column of Tribology & Lubrication Technology magazine (page 12-13 in the April 2017 issue).

  • 4/2017 X-mol.com and weixin.qq.com release a news article about our perovskite paper (in Chinese).

 

  • 1/2017 Our work on scanning photocurrent imaging microscopy of halide perovskite films made news at Case Daily, Phys.org, Sciencedaily and many other media outlets!

 

  • 11/2016 Shuhao’s paper, “Imaging the Long Transport Lengths of Photo-generated Carriers in Oriented Perovskite Films”, has been accepted by Nano Letters, a leading journal in Nanoscience and technology. This work directly shows a surprisingly long diffusion length of carriers in halide perovskite, shedding light on the material’s remarkable performance in solar cell devices. Congratulations.! The just accepted paper can be downloaded here

 

 

 

 

 

 

 

 

Positions Available


Motivated students are encouraged to contact Prof. Gao (xuan.gao @case.edu) if you are interested in working with us.