Electronic phase transitions through time in dichalcogenides on a femtosecond timescale

Datum

23.02.2017

Zeit

10:00 - 11:00

Sprecher

Prof. Dr. Dragan Mihailovic

Zugehörigkeit

Department for Complex Matter, Jozef Stefan Institute, Ljubljana, Slovenia

Sprache

en

Hauptthema

Materialien

Andere Themen

Materialien

Host

Christine Malbrich

Beschreibung

Abstract The study of phase transitions in real time under nonequilibrium conditions is of fundamental interest in many areas of physics. A special category of recent fundamental and practical interest are transitions to metastable hidden states which occur under conditions of particle-hole asymmetry. While such behavior has been invoked in cosmology to explain Baryogenesis, it is not commonly observed elsewhere. In the quasi-two-dimensional dichalcogenide, 1T-TaS2, conditions for the formation of an electronically textured hidden “false vacuum” state are created by femtosecond laser photoexcitation. Femtosecond photoexcited low temperature scanning tunneling microscopy reveals a remarkable quantum duality of polaron behavior with a vivid real-space illustration of the interplay of Mott physics and Anderson disorder localisation. The current system is of practical interest for ultrafast low-energy low-temperature non-volatile memory devices with applications in cryogenic computing.

Links

• Seminars at the IFW

Letztmalig verändert: 23.02.2017, 08:49:42