Non-linear and Time-resolved Optical Spectroscopy of Strongly Correlated Electron Systems

The main research interest of our group is to understand the behavior of large numbers of electrons in the presence of irreducibly strong interactions through an application of a wide variety of non-linear spectroscopic techniques. The contrast of these methods to the traditional techniques based on linear response - such as transport or scattering experiments - is that although linear response is a very general and powerful way of interrogating a physical system, it has one very important drawback that reduces its applicability for the systems with strong interactions. In the absence of additional external information, the linear response cannot tell a free system from an interacting one. On the other hand it is possible when analyzing the non-linear response of a system, making this approach the most natural way of dealing with strongly correlated many-body systems. To study a system beyond its linear regime one can either drive it strong enough, or to study it on timescales sufficiently short to detect the memory effects in it. Both of these approaches are easily accessible nowadays through the advent of laser able to produce ultra-short femto-second pulses of very strong intensity. An application of several such intense pulses with controlled shape, phase and polarization in a specified succession can produce a wide plethora of information not directly accessible to linear methods.

At this point the current research program can be formulated in terms of several interrelated projects. The most straightforward is to use the time resolved capabilities of pulsed laser techniques to understand the microscopic mechanism behind known phenomena such as high temperature superconductivity. Another direction is to study systems where the very concept of quasiparticles is problematic such as the so-called Bad and Strange Metals and systems near various critical points. Lastly we aim to search for transient non-equilibrium (“Floquet”) phases of many-body systems stabilized by strong periodic driving.

Zhanybek Alpichshev
Institute of Science and Technology Austria (IST Austria)
Am Campus 1
A – 3400 Klosterneuburg

Phone: +43 (0)2243 9000-2104

CV and Publication List

Alexandra Mally

Phone: +43 (0)2243 9000-1105


Selected Publications

  • Zhanybek Alpichshev, J. G. Analytis, J.-H. Chu, I. R. Fisher, Y. L. Chen, Z. X. Shen,A. Fang, A. Kapitulnik. STM Imaging of Electronic Waves on the Surface of Bi2Te3: Topologically Protected Surface States and Hexagonal Warping Effects. Physical Review Letters, 104, 016401 (2010)
  • Zhanybek Alpichshev, J. G. Analytis, J.-H. Chu, I. R. Fisher, A. Kapitulnik. STM imaging of a bound state along a step on the surface of the topological insulator Bi2Te3.Physical Review B, 84, 041104 (2011)
  • Zhanybek Alpichshev, Rudro R. Biswas, Alexander V. Balatsky, J. G. Analytis, J.-H.Chu, I. R. Fisher, A. Kapitulnik. STM Imaging of Impurity Resonances on Bi2Te3 . Physical Review Letters, 108, 206402 (2012)
  • Zhanybek Alpichshev, Fahad Mahmood, Gang Cao, Nuh Gedik. Confinement-Deconfinement Transition as an Indication of Spin-Liquid-Type Behavior in Na2IrO3. Physical Review Letters, 114, 017203 (2015)


As of 2018 Assistant Professor, IST Austria
2017-2018 Visiting Scientist, MPI for the Structure and Dynamics of Matter, Hamburg, Germany
Postdoctoral Associate, Massachusetts Institute of Technology, USA
2005-2012 PhD, Stanford University, USA
2000-2004 BS, Moscow Institute of Physics and Technology, Russia

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