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Title: Bose-Einstein Condensation and Bose Glasses in an S = 1 Organo-metallic quantum magnet

Abstract

I will speak about Bose-Einstein condensation (BEC) in quantum magnets, in particular the compound NiCl2-4SC(NH2)2. Here a magnetic field-induced quantum phase transition to XY antiferromagnetism can be mapped onto BEC of the spins. The tuning parameter for BEC transition is the magnetic field rather than the temperature. Some interesting phenomena arise, for example the fact that the mass of the bosons that condense can be strongly renormalized by quantum fluctuations. I will discuss the utility of this mapping for both understanding the nature of the quantum magnetism and testing the thermodynamic limit of Bose-Einstein Condensation. Furthermore we can dope the system in a clean and controlled way to create the long sought-after Bose Glass transition, which is the bosonic analogy of Anderson localization. I will present experiments and simulations showing evidence for a new scaling exponent, which finally makes contact between theory and experiments. Thus we take a small step towards the difficult problem of understanding the effect of disorder on bosonic wave functions.

Authors:
 [1]
  1. Los Alamos National Laboratory
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Laboratory Directed Research and Development (LDRD) Program
OSTI Identifier:
1042992
Report Number(s):
LA-UR-12-21827
TRN: US1203070
DOE Contract Number:  
AC52-06NA25396
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANTIFERROMAGNETISM; BOSE-EINSTEIN CONDENSATION; BOSONS; FLUCTUATIONS; GLASS; MAGNETIC FIELDS; MAGNETISM; MAGNETS; TESTING; THERMODYNAMICS; TUNING; WAVE FUNCTIONS

Citation Formats

Zapf, Vivien. Bose-Einstein Condensation and Bose Glasses in an S = 1 Organo-metallic quantum magnet. United States: N. p., 2012. Web. doi:10.2172/1042992.
Zapf, Vivien. Bose-Einstein Condensation and Bose Glasses in an S = 1 Organo-metallic quantum magnet. United States. https://doi.org/10.2172/1042992
Zapf, Vivien. Fri . "Bose-Einstein Condensation and Bose Glasses in an S = 1 Organo-metallic quantum magnet". United States. https://doi.org/10.2172/1042992. https://www.osti.gov/servlets/purl/1042992.
@article{osti_1042992,
title = {Bose-Einstein Condensation and Bose Glasses in an S = 1 Organo-metallic quantum magnet},
author = {Zapf, Vivien},
abstractNote = {I will speak about Bose-Einstein condensation (BEC) in quantum magnets, in particular the compound NiCl2-4SC(NH2)2. Here a magnetic field-induced quantum phase transition to XY antiferromagnetism can be mapped onto BEC of the spins. The tuning parameter for BEC transition is the magnetic field rather than the temperature. Some interesting phenomena arise, for example the fact that the mass of the bosons that condense can be strongly renormalized by quantum fluctuations. I will discuss the utility of this mapping for both understanding the nature of the quantum magnetism and testing the thermodynamic limit of Bose-Einstein Condensation. Furthermore we can dope the system in a clean and controlled way to create the long sought-after Bose Glass transition, which is the bosonic analogy of Anderson localization. I will present experiments and simulations showing evidence for a new scaling exponent, which finally makes contact between theory and experiments. Thus we take a small step towards the difficult problem of understanding the effect of disorder on bosonic wave functions.},
doi = {10.2172/1042992},
url = {https://www.osti.gov/biblio/1042992}, journal = {},
number = ,
volume = ,
place = {United States},
year = {2012},
month = {6}
}